36 Environmental Laboratory - Focus on PFAS Analysis New standard addresses PFAS concentrations in water supplies


ASTM International’s water committee (D19) has approved a new standard that will help address global concerns about the concentration of polyfl uoroalkyl substances (PFAS) in water supplies.


According to ASTM International member William Lipps, the new standard required testing of nine complex wastewater matrices, each spiked in triplicate at three concentrations spanning the analytical range of the method.


“Very good precision and recovery obtained on all matrices, along with precision and recovery obtained on spiked reagent water, were used to calculate the quality control limits included in the method,” says Lipps. “These limits establish criteria that individual laboratories must meet before running samples and criteria that will be used to demonstrate performance of labs when running samples.”


This effort directly relates to the United Nations Sustainable Development Goals #6 on clean water and sanitation, as well as #13 on climate action and #14 on life below water.


Lipps notes the new standard will help to minimize water use in laboratories and help keep water clean by providing new methods for the analysis of trace contaminants in water.


“The smaller volumes required for this test are 25-100 times less volume than a typical EPA method, reducing shipping weight and cooler size, resulting in a smaller carbon footprint,” says Lipps. “The minimal extraction, while using plastics, minimizes their use compared to other PFAS methods; in this method, the sample is extracted in the same vial in which it was sampled.”


Lipps says that all interested parties are invited to join in the interlaboratory study now being planned for the new standard, which will soon be published as D8421.


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Are you prepared for precise PFAS testing?


Per- and polyfl uoroalkyl substances (PFAS) Per- and polyfl uoroalkyl substances (PFAS) are man-made chemicals that have been used in industry and consumer products worldwide since the 1950s. PFAS are ubiquitous in water, soil, waste, living organisms, food and beverages, commercial household products and industrial workplaces; sadly, they are now an unhealthy part of our everyday life.


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Studies have shown that perfl uorooctanoic acid (PFOA) and perfl uorooctane sulfonate (PFOS) are particularly hazardous to human health, especially as PFAS can accumulate and stay in the human body for long periods of time. This is the reason that this group of substances is regulated (PFOS was included in Annex B of the Stockholm Convention on Persistent Organic Pollutants) and closely monitored worldwide. Merck’s reference material portfolio comprises neat material and solutions in analytical standard grade quality so you can ensure accurate PFAS analysis.


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Understanding PFAS analytical methods and regulations as well as choosing the right instruments and consumables is key to getting your lab ready for PFAS analysis. To shorten start-up time, Agilent provides LC/MS/MS eMethods to get you up and running in the shortest time possible.


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The PFAS in Drinking and Surface Water by LC/TQ eMethod is verifi ed for the separation and reliable detection of 100 native and isotopically labelled PFAS in drinking and wastewaters, including 60 PFAS with reported method detection limits. The method includes target compounds that are part of standard methods and regulatory lists such as, ISO 21675:2019, Europe (EU) WfD & DWD, Japan Drinking Water Quality Standards, German DIN methods, US-EPA Method 537.1, EPA Method 533, SW-846 Method 8327, SW-846 Draft Method 8327, ASTM D7979-19 and ASTM 7968-17a.


The Agilent 1290 Infi nity II LC and the Agilent 6470 triple quadrupole LC/MS are used in combination to provide high-quality LC/MS/MS results. Sample preparation is performed with Agilent SampliQ weak anion exchange (WAX) cartridges, and an Agilent ZORBAX RRHD Eclipse Plus C18 column is used in LC analysis.


In addition to acquisition and quantitation methods, the PFAS eMethod includes sample preparation protocols, a detailed training video with a step-by-step workfl ow guide, and references to expertly selected consumables and supplies to minimize cost and effort to design and plan the required analyses.


The eMethod makes use of the Agilent PFAS multiple reaction monitoring (MRM) database for triple quadrupole LC/MS, which features data for over 100 native and isotopically labelled PFAS. The database includes details of the intrinsic properties and identifi ers of PFAS such as chemical name, CAS number, and molecular formula. It also features optimized MRM parameters for the analysis of 72 native and 36 isotopically labelled compound from 14 PFAS groups, as well as retention time data from optimized methods.


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The eMethod is designed for labs that want a widely applicable testing method and that do not plan to run dedicated regulated methods. For labs running regulated methods, the eMethod in conjunction with the Agilent PFAS MRM database can be a helpful building block to modify existing methods to expand analytical capabilities.


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18.03.22 13:54


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Taking PFAS in water analysis to Infi nity and beyond


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