Case Study: Screening for Asbestos in Tuvalu with the MicroPHAZIR AS

The health risks of asbestos are well known, so much so that its use was officially banned in Australia in 2003.

Since then, extensive work has been conducted to remove asbestos where possible or to educate people on how to leave asbestos undisturbed. 

Unfortunately, its widespread presence in buildings and objects make it difficult to identify and avoid. 

The problem is, many smaller nations don’t have the resources or best-practice awareness that Australia has, and these nations remain vulnerable to the scourge of asbestos.

Asbestos on Tuvalu

Tuvalu is a Polynesian archipelago nation in the Pacific, about halfway between Australia and Hawaii. Like many other island nations, asbestos was used widely throughout the country’s infrastructure in the 20th Century and remains a risk for its citizens today. 

The Tuvalu Department of Waste Management (DWM) has been working tirelessly to identify, secure or remove asbestos throughout Tuvalu’s nine islands, but they are facing significant challenges. 

Lack of Labs

Tuvalu doesn’t have the laboratories required to test the large number of asbestos samples taken during clean-up efforts. This means the DWM is constantly being held up by lengthy lab turnaround times.

While these delays are necessary to keep their operators safe, they are still incredibly frustrating and slow down progress. 

Lack of Experts

The other resource shortage in Tuvalu is experts who can safely identify and dispose of asbestos. 

The Tuvalu island chain is relatively isolated and it can be difficult and costly to get experts to visit. That means when they do have them, they need to make the most of it!

A Possible Solution

PacWaste Plus programme technical offers, supported by consultant Ms Samantha O’Callaghan of HIBBs, visited Tuvalu on an asbestos identification mission in March.

What was different this time?

They were trialling a Thermo Fisher microPHAZIR AS Asbestos Analyser.

The Thermo Fisher MicroPHAZIR AS

The MicroPHAZAER AS is an industry-leading asbestos detection tool. With its simple point-and-shoot function, and accurate results delivered in just 10 seconds, it lets operators test for asbestos quickly and safely. . 

To screen a site, operators simply conduct a series of scans at different points, and if the results are negative they can declare an area safe. 

If the results are positive, they can send the sample away for lab confirmation, safe in the knowledge that they haven’t been exposed by needing to take a sample and disturb the contaminated object. 

Screening in Tuvalu

The rapid testing ability of the microPHAZIR AS could make a real impact for the DWM’s initiative. 

“Undertaking asbestos assessments is very difficult in Tuvalu.  We do not have laboratory equipment and it is difficult and expensive for external specialists to visit our outer islands to complete assessments,” said Mr Epu Falenga, Director of Waste Management.

With the microPHAZIR AS, the hope is that much wider areas can be covered in a much shorter time period. 

“By testing this new technology and having our own staff experience the various steps to effectively undertake asbestos sampling, empowers us to roll out an assessment ourselves across our nine islands.” Mr Falenga continued. 

The Trial

While hopes are high that the microPHAZIR AS will be effective, testing must be completed to ensure it is compatible with Tuvalu’s conditions. 

“We need to be certain on the efficacy of this tool, especially in our island settings.” said Mr Falenga. 

As part of the trial, Ms O’Callaghan took samples determined to be ‘positive’ for asbestos and sent them to Australia for laboratory confirmation. A capacity building workshop was also conducted with the DWM team, as well as ten other government stakeholders from the Department of Customs and Department of Surveying.

The hope is that the sample determinations will be corroborated in the lab, and that the combined team in Tuvalu will already have the skills required to operate their devices. 

To Be Continued

The cause to rid Tuvalu of asbestos is a noble one, and the outcome of this trial will be relevant for the wider Pacific Island region.

For the operators at DWM, any developments that make asbestos detection safer, faster and more accurate will be welcome.

Images and information obtained from www.pacwasteplus.org

Near-Infrared Spectroscopy (NIR) and Fourier Transform Infrared Spectroscopy (FTIR) are two molecular analysis technologies that are used in a wide range of industries – especially mining.

While NIR is a well-known and well-established technology, FTIR is often considered the new kid on the block, and you may not know much about it.

So, which one is the best for your needs?

Read on to learn the difference between NIR and FTIR.

What is NIR?

Near-Infrared Spectroscopy (NIR) is a non-destructive analytical technique that identifies the molecular composition of a sample.

When the light in the near-infrared region is applied to the sample, the amount of light absorbed or reflected at different wavelengths can be measured. This can be used to identify the presence and abundance of different elements.

What is FTIR?

Fourier Transform Infrared Spectroscopy (FTIR) is also a technique used to identify and analyse the molecular structure of a material.

Unlike NIR, FTIR applies fully infrared light to the sample and measures how much light is absorbed in different wavelengths. Using the Fourier Transform method, it can analyse the entire spectra simultaneously, improving the speed and scalability of its analysis.

What’s the Difference Between NIR and FTIR?

The main difference between NIR and FTIR is the spectral range they use for analysis. NIR uses light in the near-infrared region (approximately 350-2500 nm), while FTIR uses light in the mid-infrared region (approximately 4000-400 cm^-1).

This difference in wavelength range affects the types of samples that can be analysed. This means NIR and FTIR aren’t like-for-like substitutes, but are instead complementary.

Benefits of NIR

NIR is best used for testing a larger sample size, where compositions aren’t exceedingly complex. This makes NIR a preferred method for quantitative analysis, where the aim is to idenitfy the main components of a sample range quickly.

NIR is also able to analyse all three states of matter: solids, liquids and gases. This means along with identifying the composition of a sample, it can also detect the moisture content and air pockets which can effect what the sample is worth and how it may need to be processed.

It’s ability to analyse wide ranges of samples across different states of matter makes it ideally suited to greenfield mining exploration.

Benefits of FTIR

The biggest strength of FTIR is it can assess an impressively wide spectra which lets it identify trace elements like chemicals and other contaminants.

Along with trace elements, it can also provide far more detailed breakdowns of sample composition because it can examine the entire spectra simultaneously, rather than having to examine individual wavelengths.

The ability to assess the composition of samples to such a precise level opens up a lot of opportunities in the mining industry. Not only does it shed more light on the true value of a sample, it can also reveal the transformation history of the minerals in the area.

The other benefit of FTIR is the speed of its analysis. The Fourier Transform method means the entire spectrum is analysed as a whole, saving time from having to measure singular wavelengths.

NIR vs FTIR: Which is Better?

In this case, it isn’t ‘which is better’, but rather which do you need? Either NIR or FTIR could be more suitable depending on the application.

For analysis of larger sample sizes, NIR is likely to be more suitable. However, for a more in-depth breakdown of sample composition, FTIR may be your preferred solution.

The TerraSpec 4 Analytical Spectral Device

The TerraSpec 4 Analytical Spectral Device is a portable, full-range NIR spectrometer.

It delivers highly accurate results in mere seconds, all without damaging the sample. Highly regarded among top geologists worldwide, its ease of use and rugged reliability means your operators will have the ability to take accurate readings in the field.

It also comes with several incredible features, including:

• High-res and standard-res options
• Non-destructive, reliable analysis
• Portable and built for endurance
• Unparalleled alteration mineral analysis
• Rapid key mineral identification

For rapid NIR results, you can’t go wrong with a TerraSpec 4!

The Agilent 4300 Handheld FTIR Analyser

The Agilent 4300 Handheld FTIR Analyser is the first of its kind and has quickly become the leading handheld FTIR device on the market. With its easy point-and-shoot functionality and lightweight (only 2 kgs) design, it really is the premier option for FTIR analysis in the field.

One of the most time-consuming tasks in any analysis process is the wait for laboratory results. However, with the Agilent 4300, you can obtain instant results in the field, allowing for faster progress.

This instrument also offers an interchangeable interface, making it easy to switch between analysing different materials, such as changing from analysing a polymer sample to analysing a soil sample. Additionally, the Agilent 4300 can analyse solids, liquids, and gases, making it highly versatile.

Portable Analytical Solutions

To put it simply, portable analysis devices are the best way to gather highly accurate data when in the field or on the move.

Portable Analytical Solutions supplies various NIR and FTIR analysis devices for a range of industries across Australia and New Zealand.

To purchase your own ASD TerraSpec 4 or Agilent 4300, don’t hesitate to get in contact today.

Fool’s Gold: How XRF Precious Metal Testing Saves You From Being Swindled

Precious metals are, as the name would suggest, very expensive commodities. From jewellery to luxury household items, they are highly sought after and extremely rare.

The problem is, just like most naturally occurring metals and minerals, their quality depends on the purity of their composition. This means knowing the precise quality of what you’re buying is vital if you want to stay profitable in the precious metals industry. 

Read on to learn how precious metal testing, specifically with X-ray fluorescence (XRF), can save you from being swindled. 

What are Precious Metals?

Precious metals are elements that aren’t naturally abundant. As with most commodities, supply and demand affects the price. In this case, precious metals are extremely expensive because their supply is scarce while demand for them is high.

Specifically, the four main precious metals are:

• Gold
• Silver
• Platinum
• Palladium

Of these four, gold is the most recognisable and universally sought after, especially for its use in jewellery. 

What is Precious Metal Testing?

Precious metal testing aims to identify the purity of an alleged precious metal sample. While a precious metal may look pure, most samples are alloys, meaning they are mixed with other elements or other precious metals. 

For example, gold has five common alloys to be aware of:

• Fine gold – 99.9% pure gold
• Gold alloy – Gold mixed with other elements
• Yellow gold – silver alloy
• Rose gold – copper alloy
• White gold – palladium or nickel alloy

To accurately price these alloys, you need to know specifically how much gold is in the alloy. Otherwise, you may be paying for more gold than you are actually receiving. With the price of gold increasing, this isn’t a mistake you can afford. 

Precious metal testing becomes even more important when you consider the gold is likely a part of an object, such as an inlay on a piece of jewellery. This makes it even more difficult to test without having to destroy the object by removing the gold component. 

Which Technology is the Best for Precious Metal Testing?

With the stakes so high, you need to know that your precious metal testing solution is highly accurate and can provide instant results. 

XRF is widely accepted in the industry as the best precious metal testing technology, especially because it doesn’t damage the sample. 

Using an X-ray, it excites the sample and measures the fluorescence emitted by it. Each element creates a different type of emitted X-ray, which allows for detailed measurement of the composition of the sample. Only XRF can test quickly, precisely and non-destructively in such an intuitive and easy-to-use way. 

Precious Metal Testing with XRF 

XRF precious metal testing is big business and comes with many benefits. 

Saves Your Money

One of the most common precious metal testing methods for gold is acid testing. But there are two major drawbacks that could cost you a lot of money. 

Firstly, the acid tests are deemed ‘safe’ for the sample because they only damage it if it’s fake. But in pawnbroking or jewellery industries, just because a sample isn’t real doesn’t mean the object is worthless. 

The owner may still like the item even if it doesn’t contain real gold. Or, it could contain a mixture of real and fake materials, like fake gold but real silver. By damaging the fake gold, you’ve now lowered the overall value of the item. The seller is not going to be happy and you’ll likely have to purchase the item or compensate them for the damage.

Thankfully, XRF is non-destructive. The part of the sample that is excited by the X-ray is so minuscule that it can’t be seen by the naked eye. This means you can confidently test any kind of sample without fear of damage. 

The second issue is that acid testing isn’t as accurate as XRF. While it can tell you if gold is real or fake, true success in the precious metal industry comes from knowing the exact quantity and quality of the precious metals you buy and sell.

XRF tells you the precise composition of the sample, empowering you to be confident in your transactions. 

Saves Your Time

XRF isn’t just the most accurate precious metal testing method – it’s also the fastest!

Acid testing requires you to scratch the surface of the sample and then carefully administer the acid. Because the acid is corrosive, you also need to wear protective gear and be in a controlled environment.

With XRF, the X-ray excites the sample in just seconds, giving you an extremely quick reading. The sample doesn’t need to be prepared, and you don’t have to take any precautions. Simply use your XRF device and get precise analysis on the spot. 

It’s also worth mentioning that other testing methods like acid require you to go out and purchase testing kits. That’s an incredibly inefficient system if you are testing large quantities of precious metals on a daily basis. With XRF, you only need one device and it will last you for years. 

Saves Your Reputation

Fast and accurate testing obviously increases your capacity to trade and the money you can make through trading, but there is also something else they improve – your reputation!

As technology improves, the industry expects you to improve with it. If you’re still using precious metal testing methods that require identification through sight, touch or torches, the commodities you sell are soon going to be scrutinised by people who are using XRF. 

Buyers will become increasingly wary (if they aren’t already) of traders who don’t use advanced testing methods. If they are using XRF and you aren’t, the discrepancies between their analysis and yours will become too glaring to ignore. 

The Niton XL2 Precious Metal Analyser

So, you’re convinced of the power of XRF technology for precious metal testing, but you aren’t sure which tool to use?

Well, the answer is simple. 

The Niton XL2 Precious Metal Analyser is the class leading portable XRF analyser that combines powerful analysis with ease of use. 

Its point and shoot simplicity means you simply have to press it against the sample and hold the trigger; no costly sample preparation required. 

It is programmed with a detection limit of 25 elements ranging from Sulphur (S) to Uranium (U), and is especially designed using Thermo Scientific AuDIT™ gold-plating detection technology. This makes it ideal for retail scenarios where objects with gold plating are regularly passed off as solid gold. 

With the Niton XL2 Precious Metal Analyser, never get swindled again! 

Portable Analytical Solutions (PAS) is a proud distributor of Niton products, including the XL2. To purchase or rent an XRF device and take your precious metal testing to the next level, get in touch today. 

For information on other industries and technologies serviced by PAS, visit our website. 

The Phenotyping Phenomenon: How Plant Phenotyping Technology Improves Plant Performance

For much of history, people prayed to their gods to deliver them a good harvest. There’s no need to pray anymore…

With the help of plant phenotyping technology, you can control almost every aspect of your crop growth, making you more confident in your yields.

Read on to learn more about what plant phenotyping is and how it can improve your plant performance. 

What is Plant Phenotyping?

Plant phenotyping is the study of a plant’s physical and physiological traits. By gathering this information, you can get a complete picture of a plant’s phenotype, which includes all its observable characteristics and helps you create the perfect conditions for optimum growth. 

The History of Plant Phenotyping

While people have been experimenting with plant phenotyping since the invention of agriculture, it first became a recognised discipline in the 19th century. Scientists, armed with Darwin’s theory of evolution, began studying plant anatomy and physiology to better understand their growth and development. 

In the early 20th century, plant breeding became more widespread. Advancements in smart digital farming have made plant phenotyping a rapidly advancing science in recent decades.

How Does Plant Phenotyping Work?

Plant phenotyping measures and analyses various physical plant traits, such as their: 

• Height
• Biomass
• Root length
• Leaf size and shape
• Flower colour

This list is by no means exhaustive, and will differ depending on the plant species. For example, some plants may not have roots, while some may not have flowers. 

It isn’t just the physical characteristics that are assessed. The plant’s physiological characteristics are also important. These can include:

• The presence of parasites or mould growth
• Photosynthesis 
• Transpiration
• Water use efficiency
• Susceptibility to climate and temperature

Once again, there may be many more characteristics analysed depending on the specific species. This information tells you what’s going on beneath the surface, especially when considering how the environment impacts growth and yield. 

Finally, the data collected from both physical and physiological measurements is analysed to get meaningful insights into the plant’s phenotype. These insights can be used to understand the genetic and environmental factors that impact plant growth and development, and make informed decisions about breeding programs and crop management.

The Benefits of Plant Phenotyping

There are many benefits to integrating plant phenotyping into your crop management plan.

Improved Plant Survivability and Yield

Plant phenotyping helps identify the genetic and environmental factors that affect the viability of your crops. By identifying the risk factors that cause plants to die or under-produce, you can perfect your growing conditions, leading to improved yields and plant health.

Improved Understanding of Ideal Environment

Plant phenotyping can help you understand how plants respond to various environmental stressors, such as drought, heat, and salinity. This information can be used to develop more resilient crops that can better withstand these factors..

Better Breeding Selections

Information from plant phenotyping can help breeders select the best plants for breeding. Desirable traits can include:

• Survivability
• Interesting or unique traits
• Natural disease resistance
• Climate hardiness
• Optimal yield 

This helps you eliminate undesirable genes and diseased plants from your crop, or helps you breed a hardier crop over time. 

How Has Technology Impacted Plant Phenotyping?

Plant phenotyping previously needed to be done by hand, but advancements in image processing and simulating environmental conditions has made phenotyping less labour intensive and more scalable. One tool that can do both is the LemnaTec PhenoTron. 

The LemnaTec PhenoTron

The LemnaTec PhenoTron will revolutionise your ability to assess and experiment with different phenotypes.

It combines the imaging and image processing capabilities of a LabScanalyzer with the advantages of a climate-controlled growth cabinet. This means you can trial different simulated climates on control groups and capture high resolution images to show how they are affected. The PhenoTron can simulate wild temperature fluctuation with its impressive 15°C to 40°C range.

The PhenoTron’s climate-controlled growth chamber is equipped with tunable LED light sources and top stereo RGB cameras, meaning images can also capture the morphology and colour of your samples. 

Better yet, you don’t even have to take them yourself. The machine can take them automatically on schedules that you set using the touchscreen interface. 

The PhenoTron is capable of handling various sample sizes, from petri dishes and beakers, to seedlings, all the way to mature plants. You can even test disembodied samples, like leaves or branches. 

Armed with the knowledge that the LemnaTec’s PhenoTron provides, you save your experimentation for samples, rather than risking losing your entire crop. Then, once you have the results, you can make large scale adjustments to your crop management plan. 

Portable Analytical Solutions

Portable Analytical Solutions supplies all sorts of analysis devices for a range of industries across Australia and New Zealand. 

While agriculture is one such industry, there are many others that could also help you make sample analysis faster and more accurate. 

To purchase your own LemnaTec PhenoTron, or one of our other plant phenotyping products, don’t hesitate to get in contact today. 

The days of farmers visually inspecting and manually harvesting their crops in large-scale industries are ending. It is now far more efficient and profitable to use machines to assist these processes.

Known as smart digital farming, the limitations of human physiology are continually being negated with advancements in technology. As the global population increases, there are now 8 billion of us, this technology will be key in ensuring that agriculture keeps up with increasing human consumption.

Read on to learn more about how smart digital farming is the future of agriculture. 

What is Smart Digital Farming?

Smart digital farming, also commonly referred to as precision agriculture, is a series of cooperating technologies that combine to optimise farming processes and results. The five main technologies associated with it are advanced imaging, sensors, robotics, data analysis and machine learning. 

When working together they make monitoring, sorting and harvesting crops an automated, or at least heavily assisted, process. 

What Technologies are Used for Smart Digital Farming?

The following five technologies are integral to smart digital farming. 

Advanced Imaging

Advanced imaging is an umbrella term that refers to technology that captures high-resolution images of crops or seed batches. These can be analysed and scored by the machine itself, or categorised and stored for later analysis. Machines can quickly and accurately score samples based on the parameters you input. This happens quickly and eliminates the risk of human error. 

Sensors

Remote sensing allows you to analyse vast crops using spectral imaging. Spectral imaging measures light wavelengths emitted from surfaces and assigns a colour to each pixel that acts as a unique signature. Subtle changes to a plant’s composition, such as wilting at the edges or the presence of mould, will appear as different colours, including when the differences are subtle enough to not be seen by the human eye. 

Robotics

Agriculture will always have a physical element to it. Seeds will always need to be planted and crops will always need to be harvested. However, these actions don’t necessarily need to be completed by humans. Machines can automate many of these processes at a large scale. Even surveying can be done remotely with UAVs. In the future, it may become possible for farmers to never need to set foot on the farm!

Data Analysis and Storage

The days of keeping written data are gone. Not only does data need to be digital, it needs to be easily integrated with analysis systems and programs. High-quality precision agriculture devices will have built in data storage and organisation features, with some conducting the analysis as well. 

Machine Learning

Machine learning is when artificial intelligence (AI) in smart digital machines can teach itself without user inputs. A common example is when devices use historical data to refine their algorithms. This means machines become exponentially more effective, as the data they learn from becomes more accurate over time. 

What are the Advantages of Smart Digital Farming?

Smart digital farming increases both profitability and output in all areas where it’s applied. With that said, there are four main benefits that can be identified as the most transformative for agricultural enterprises. 

Saves Labour

To survey an entire field on foot, or inspect every seedling in a batch by hand, you need to pay labour costs. These costs quickly add up, especially when hiring people with more expertise and attention to detail who are more expensive.

Labour is also time consuming. Manual seed testing requires the careful documentation of hundreds of seedlings, while a crop inspection of a large property could require days of travel time. By using technologies like advanced imaging or UAV mounted sensors, you can complete these processes in far less time. 

Saves Costs

In addition to saving labour costs, smart digital farming also reduces waste. With advanced imaging you can identify diseased, mouldy or infested plants before they can spread throughout the crop. You can also be more judicial with the use of water and pesticides by paying greater attention to portions of the crop that require extra care. 

Imaging and machine learning also allows you to troubleshoot genetic issues to eliminate poor quality strains from your batches. Machine learning will improve its algorithms over time by adding historical data of poor seeds and samples to its evaluation criteria. This will exponentially reduce the amount of waste over time. 

Increases Yield

Just as imperfect plants can be removed from crops, the best performing ones can also be identified and used to create better yielding strains. This assisted phenotyping means crops will yield more over time. 

Increased yield obviously makes your enterprise more profitable, but it also enhances your reputation as a supplier. Both of these gains help put you in a position to expand your business.

Increases Scalability

Saving labour and costs, combined with increasing yields, makes your operation far more scalable. From studying seed germination to having a large acreage of ground-standing plants, you are limited by your ability to plant, monitor and harvest. 

With smart digital farming you are able to expedite all three of these processes, allowing you to expand your operations. 

PAS Offer Smart Digital Farming Devices

At Portable Analytical Solutions, we offer a range of devices that can unlock your smart digital farming potential. Headwall Photonics and LemnaTec are both leading manufacturers in the precision agriculture space. While they each have an impressive array of tools, we’ve highlighted two of the most essential for both large and small scale agricultural operations. 

The Headwall Photonics Hyperspec Nano 

The Hyperspec Nano is the premier UAV-mountable device for large scale spectral imaging of crops. Manage the health of your plants remotely by surveying large portions of your crops at once. Don’t waste precious time and labour on collecting samples and manual surveying. 

The Lemnatec™ SeedAIxpert 

The Lemnatec™ SeedAIxpert will transform your seed germination testing operation. Don’t rely on individually scoring hundreds or thousands of seeds. Eliminate wasting time and the risk of human error with advanced imaging. The Lemnatec™ SeedAIxpert photographs, scores, and analyses your seed batches for you based on your parameters. 

If you’d like to acquire a device from our smart digital farming range, get in touch today. 

For more information about PAS, including technologies for other industries, visit our website.

Hyperspectral imaging technology is an integral part of mining in Australia. Images taken at high resolutions can reveal astonishing amounts of data without needing physical samples.

The catch is, the quality of the images directly affects the quality of the results. 

Chromatic aberration is an optical problem in cameras and some sensors that can distort hyperspectral images and make data unusable. 

If you are in an industry that uses hyperspectral sensors, read this article for an explanation and solution for chromatic aberration. 

What is Chromatic Aberration?

Chromatic aberration, which is commonly referred to as colour fringing, occurs when a lens can’t accommodate all the wavelengths of colour on a focal plane, or if the colours are focused in different positions. 

This means colours travel at different speeds through the lens, known as dispersion, and they blur the image. Colours can appear to bleed into each other, or from the ‘fringes’ of objects in the image. 

What are Hyperspectral Sensors?

Hyperspectral imaging (HSI) captures a wide spectrum of light beyond the primary colour range. Individual pixels can be assigned colour ‘signatures’ because each one will emit light slightly differently on the spectral band. These signatures can then be paired with specific minerals during the analysis stage. 

Hyperspectral imaging is used widely in mining and food industries because it can facilitate detailed analysis and predictions without having to collect and destroy physical samples. 

How does Chromatic Aberration Affect Results? 

Chromatic aberration can severely affect results and make images completely unsuitable for analysis. There are two kinds of chromatic aberration. 

Longitudinal Chromatic Aberration

The first is longitudinal aberration, also known as axial aberration. This occurs when the wavelengths fail to converge at a single point after passing through the lens. This commonly causes fringing, where the outlines of objects or distinctive features have an incorrectly coloured tinge, usually green or purple. 

This colour distortion means light ‘signatures’ can’t be correctly applied where chromatic aberration occurs. 

Lateral Chromatic Aberration

The second type is lateral chromatic aberration, also known as transverse chromatic aberration. This occurs when wavelengths hit the lens at an angle, causing them to reach the focal plane at different positions. This is common with fish eye lenses that allow light to penetrate at unusual angles.

Unlike longitudinal aberration, the fringing won’t appear around the object, but towards the edges of the image instead. Despite this difference, both cause issues with signature assignment and are a threat to accurate data when aberration occurs in hyperspectral imaging. 

Can Chromatic Aberration be Prevented?

Lenses are prisms. This means imperfections in the lenses can cause wavelengths to behave erratically when passing through. Most instances of chromatic aberration are caused by imperfections in the lenses themselves. For photographers, keeping their lenses well maintained and editing out aberrations after the fact is usually sufficient. 

For hyperspectral imaging purposes, time and data are money. You can’t afford to waste either dealing with chromatic aberration. That’s why hyperspectral imaging sensors do away with lenses altogether. Instead, they opt for diffraction gratings.

Diffraction gratings work in the opposite way to lenses. Where lenses focus wavelengths on a single focus plane, diffraction scatters the light instead. This light passes through a lattice where it is processed and reconstructed as a legible image.

Since there is no lens, hyperspectral imaging sensors are mostly immune from the chromatic aberration effect. The only exception to this is if the sensor doesn’t have the ability to read the full light spectrum that is being emitted. In this case, unrecognised colours could still manifest incorrectly in the final image. 

Headwall Photonics

If you want hyperspectral imaging devices that are application specific and can eliminate chromatic aberration over the entire spectral range, Headwall Hyperspectral Sensors are the devices for you.

PAS is the leading supplier of Headwall Photonics products in Australia and New Zealand. They have a wide range of hyperspectral sensors for mining and other industries. 

In particular, the Hyperspec VNIR – SWIR Co-Aligned uses its chromatic aberration correcting imagery to map large swathes of land with a high degree of accuracy. This product is incredibly popular for land surveying and mining exploration – especially with its UAV-mounting capabilities. 

If you’d like to inquire about purchasing your own Hyperspec VNIR – SWIR Co-Aligned, or any other incredible Headwall device, get in touch today.

For more information about Portable Analytical Solutions, visit our website. 

Clear as Mud: 5 Common Methods for Contaminated Soil Testing

You can often tell how land has been used decades after based on the composition of its soil. Depending on what the land needs to be used for, the absence of nutrients and biodiversity, or the presence of toxic contaminants, can all affect its value and viability.

There are several common methods for contaminated soil testing, and some are more effective and efficient than others. Read on to learn about them. 

What is Contaminated Soil Testing?

Contaminated soil testing checks soil for the presence of toxic materials, such as:

• Chemicals
• Waste
• Metals (especially arsenic, mercury and lead)
• Pesticides
• Asbestos

For land to be viable for certain industries, especially agriculture, it needs to be tested. Likewise, for land to be developed into residential areas, the soil needs to be safe for human habitation.

Why is Accurate Contaminated Soil Testing Important?

Contaminants in soil can harm people in a lot of different ways. It can be absorbed into crops and eaten, and it can be absorbed through our own skin or inhaled. It’s also possible for contaminated soil to leach into the water supply. 

Asbestos soil contamination in particular is a serious threat, as asbestos can lead to terminal illnesses. 

This high risk to human health means the testing of soil is highly regulated. To develop land without the risk of lawsuits, it’s essential that you have a testing method that is fast and accurate. 

The 5 Most Common Methods for Contaminated Soil Testing

The below methods are the most common contaminated soil testing methods, but some are more effective than others. 

1. Gas Chromatography (GC)

The gas chromatography method takes a sample, in this case a small portion of soil, and is put into a gas chromatograph. This device then heats the sample to make it volatile. This heat converts the sample to gas, which passes through an analytical column.

At the end of the column is a detector, which analyses the gas. Different components of the sample will produce different gases, which are recorded by an acquisition software, and will create a chromatogram, which shows a breakdown of the components of the sample.  

The problem with GC is that it is a physical testing method, which comes with several limitations. First, it destroys the sample in the process, which means two samples need to be taken, one for your GC test, and another for lab confirmation.

The gas chromatography is also prone to malfunctions, gas leaks and incorrect assembly. If this occurs, not only does it potentially skew results, but it also costs time and requires another sample to restart the process. Overall, even when GC works correctly, it takes a long time compared to other technologies in this list.

2. Laser-Induced Fluorescence (LIF)

The laser-induced fluorescence method takes a sample and excites it with a laser. The molecules of the sample become so hot that they become electronically excited. As they return to their ground state, their fluorescence and the resulting spectrum is captured by a photodetector. 

LIF can also be used to detect vibration wavelengths in liquid samples. In these cases it’s the vibrations that are measured. 

Laser-induced spectroscopy is a popular method, but it does have a serious drawback. It’s predominantly designed to identify hydrocarbons, which makes it an excellent testing method for gas, petroleum and oil contamination. The problem is, organic and certain heavy metal substances can also fluoresce and affect the readings. 

3. Infrared Spectroscopy (IRS)

The infrared spectroscopy method uses infrared radiation to test the composition of a sample. By exposing a sample to infrared radiation, the time it takes for the radiation to be absorbed can be measured. Because the sample will be made of various components, the absorption rates will differ on a molecular level. These differences can then be mapped spectroscopically. 

IRS generates very accurate results, because it can test very narrow wavelengths. The problem is, to achieve this, the sample needs to be prepared into very thin layers to facilitate attenuated total reflection (ATR). This can be very time consuming. 

4. Near Infrared Spectroscopy (NIR)

The near infrared spectroscopy method works very similarly to IRS. It also uses radiation absorption times to create a spectroscopic outline of the different components in a sample. Where it differs is the kind of radiation it uses. As its name suggests, it uses near infrared, rather than fully infrared radiation. This allows it to detect a broader electro-magnetic range. 

Unlike IRS, NIR doesn’t require complex sample preparation because it has the capacity to detect more broadly. This means it is a great tool for testing a wider range of samples, and for testing them quickly. 

The only problem is that to allow the broader range, there is a necessary tradeoff in detection limits. This means it’s ideal for giving an overview of the presence of possible soil contamination, but you would be better off using IRS for a comprehensive breakdown of a particular sample. 

Combined, IRS and NIR can offer a robust contaminated soil testing solution.

5. X-Ray Fluorescence (XRF) 

The X-Ray fluorescence method irradiates a sample with X-Ray radiation. Afterwards, as the sample stabilises, electrons emit fluorescent X-Rays of their own. Different elements have different energy release peaks, which act like fingerprints, allowing them to be recorded on a spectrograph. 

While the methods may sound similar, the main difference between XRF, and IRS and NIR, is that XRF analyses at an atomic, rather than molecular level.  This means it combines the accuracy of IRS with the broad spectrum of NIR. 

It also obtains near-instantaneous results, which makes it the ideal technology for working in the field with portable devices. Additionally, it can detect all 26 elements of EPA Method 6200, making it one of the most sought after contaminated soil testing methods in the industry. 

The Niton XL2 and XL2+ Analysers

Thermo Fisher’s Niton XL2 and XL2+ Analysers are the best tools for contaminated soil testing on the market. 

The XL2 is calibrated to detect 30 elements from sulphur to uranium, while the XL2+ can detect from magnesium to uranium. Along with testing for trace metals, they can also identify geochemical traces. 

Their easy point-and-shoot functions and real-time results help minimise how long you or your team need to spend on potentially contaminated surfaces, and it also means testing is much quicker.

Rather than waiting for costly lab analysis turnaround times, you can reliably screen a site before starting work. Then, once lab confirmation arrives, you can start without costly interruptions. 
To purchase your own Niton XL2 or XL2+ Analyser, get in touch with us today.