Table of Contents
Understanding the Different Types of PFAS Contaminants and Their Testing Methods
A technical paper by Olympian Water Testing specialists
Introduction to PFAS contaminants
PFAS (per- and polyfluoroalkyl substances) contaminants are synthetic chemicals used in many industries and products since the 1950s [1]. Chemically stable and heat, water and oil-resistant, they can be applied in a lot of industrial and commercial purposes. For instance, nonstick cooking pots, stains-resistant fabrics and carpets, water-repellent clothes, and firefighting foams are just a few products that may contain PFAS [2].
PFAS contaminants have emerged as emerging contaminants of concern (ECoC) since they can negatively affect the human and environmental environment [3]. They are associated with various illnesses, from cancer to immune system dysfunction, foetal and breastfed infant developmental problems, and thyroid hormonal disturbance [4]. PFAS chemicals, in addition, will accumulate in the environment and stay there for decades as they are non-degradable. This results in contamination of soil, water and air, as well as toxic exposure to people and wildlife [1].
There are various PFAS contaminants such as perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA) and perfluorononanoic acid (PFNA) [2]. Most known and well researched PFAS pollutants are PFOS and PFOA, which were designated as "likely" human carcinogens by the International Agency for Research on Cancer (IARC) [4]. The IARC classes PFNA as a "possible" human carcinogen [4].
PFAS pollutants are introduced into the environment by many sources including industrial effluent, landfill and PFAS-containing products discharged into the environment [1]. They can also be airborne in the course of production or PFAS products [2]. Further, PFAS contaminants also enter the environment through firefighting foams, used at airports and military installations [3].
Testing for PFAS in environment and human tissues can be done in several ways including analysis using liquid chromatography-mass spectrometry (LC-MS) or gas chromatography-mass spectrometry (GC-MS) [2]. These methods are used to measure PFAS contaminants at the molecular level, and are used extensively in both research and regulatory applications [1].
In summary, PFAS contaminants are a class of artificial chemicals with numerous industrial and commercial applications. They have been designated as new environmental pollutants of concern for their negative health effects and the environment, and PFAS compounds are of three primary types – PFOS, PFOA, and PFNA. Several tests are available for PFAS contaminants in the environment and human tissue including LC-MS and GC-MS.
[1] Environmental Protection Agency. (2021). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Mayo Clinic. (2021). Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS).
[3] National Institute of Environmental Health Sciences. (2021). Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS).
[4] World Health Organization. (2019). Perfluoroalkyl substances (PFAS).
History of PFAS use
Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals used since the 1940s [1]. They are chemically special with excellent heat, water and oil resistance and can be found in a wide variety of industrial and consumer products.
The chemical corporation 3M first made PFAS in the 1940s for their non-stick cookware [2]. They were advertised as "miracle" substances because they were non-stick and water, oil and stain repellent. Over the next several decades, PFAS were applied to a multitude of industrial and consumer goods such as firefighting foams, food containers and cosmetics [3].
The use of PFAS has been common enough that they have been criticised for the damage they do to human health and the environment [4]. Many PFAS are persistent, which means they don’t break down quickly in the environment and can build up in the food chain [5]. There is also some evidence that some PFAS can have health effects in humans including causing increased cholesterol, hormones and lowered fertility [6].
Regulators have reacted to these concerns by limiting the use of some PFAS. PFAS are one of the "substances of very high concern" in the European Union and strictly regulated [7]. In the United States, the Environmental Protection Agency (EPA) has published a guidance on PFAS water treatment, and issued interim health advisories for two PFAS compounds: perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) [8].
Contamination with PFAS is an effective way to mitigate these chemicals’ risks. PFAS can be measured and found in the environment and in human tissues in several ways. Some commonly used methods include:
Enzyme-linked immunosorbent assay (ELISA): It’s a test performed using antibodies to detect specific PFAS in a sample [9]. It is pretty fast and easy, but might not work on all PFAS.
Gas chromatography-mass spectrometry (GC-MS): Separates and detects the constituents of a sample with a combination of gas chromatography and mass spectrometry [10]. Highly sensitive and capable of identifying all types of PFAS, but it takes sophisticated machinery and skilled operators.
Liquid chromatography-mass spectrometry (LC-MS): This approach is similar to GC-MS, but with liquid chromatography instead of gas chromatography to deconstruct a sample [11]. It’s also highly sensitive, and can pick up most types of PFAS, but it takes special machines and experts to operate.
Also available as field-applicable tools for environmental PFAS detection are portable GC-MS and LC-MS equipment and immunoassay kits [12]. These are instruments that are meant to be carried out in the field and they might give quick results, but they may not be as sensitive as the lab.
PFAS are, in conclusion, synthetic chemicals that have been around since the 1940s, used in many industrial and consumer goods. They are also worried about the health and environmental effects of PFAS, and regulators have started to crack down on their use in some countries. Testing for PFAS contamination is one important first step in determining if the contaminants pose risks, and there are a number of methods for testing and measuring PFAS.
[1] Environmental Protection Agency. (2019). PFAS: An Overview.
[2] 3M. (n.d.). A Brief History of 3M.
[3] Environmental Protection Agency. (2017). PFAS in Drinking Water.
[4] Centers for Disease Control and Prevention. (2018). PFAS: Health Effects.
[5] Environmental Protection Agency. (2019). PFAS: Environmental Fate and Transport.
[6] European Food Safety Authority. (2016). Scientific Opinion on the risk to human health from the presence of perfluorooctane sulfonic acid and perfluorooctanoic acid in food.
[7] European Chemicals Agency. (2018). Per- and polyfluoroalkyl substances (PFAS).
[8] Environmental Protection Agency. (2019). Health Advisories for PFOA and PFOS.
[9] United States Department of Health and Human Services. (2015). Test Method: Enzyme-linked Immunosorbent Assay (ELISA).
[10] United States Department of Health and Human Services. (2015). Test Method: Gas Chromatography/Mass Spectrometry (GC/MS).
[11] United States Department of Health and Human Services. (2015). Test Method: Liquid Chromatography/Mass Spectrometry (LC/MS). Retrieved from https://www.atsdr.cdc.gov/
[12] Environmental Protection Agency. (2019). Field-Deployable Analytical Methods for PFAS.
PFAS contamination of water sources
Per- and polyfluoroalkyl substances (PFAS) are chemicals that have long been used extensively across many sectors because of their special chemical nature – their resistance to heat, water and oil [1]. These attributes have made PFAS practical in nonstick cookware, odourless clothing and flooring, and firefighting foams [2]. But PFAS persistence in the environment and its possible human health harm have increased their attention and regulation [3].
PFAs in soil are released into the environment by many different means such as from the discharge of PFAS-based waste to landfills, from PFAS-based products on soil, and from the PFAS released into the atmosphere during manufacturing, use and disposal of products containing PFAS [1]. PFAS also get into soil by re-eroding land with biosolids, organic wastes generated during wastewater treatment [4].
We do not know what impact PFAS contamination will have on agricultural yields and the environment, but it does seem that some PFAS are toxicity to plants and animals. According to some researches, excess PFAS in the soil results in less growth and decreased yields [5]. Furthermore, PFAS have been found to sit in the environment and be toxic to wildlife [3].
There are a few ways to test soil for PFAS. One of them is liquid chromatography-tandem mass spectrometry (LC-MS/MS) [6]. It consists of taking all the PFAS in a soil sample and analysing the concentration of individual PFAS by mass spectrometer [6]. Other tools like inductively coupled plasma mass spectrometry (ICP-MS) or gas chromatography-mass spectrometry (GC-MS) are also available to evaluate PFAS in soil [6].
PFAS contamination in soils should be properly tested and removed, both for farm productivity and the environment. Environmental regulatory agencies like the Environmental Protection Agency (EPA) in the US have regulations and standards regarding the acceptable PFAS concentrations in soil [1]. But there’s still some discussion as to whether these guidelines are adequate and whether PFAS should be more strictly monitored [3].
Conclusion: Soil contamination with PFAS is an issue because of the effects on productivity and environment. Different testing methods are available for soil testing for PFAS and regulators should set standards for what constitutes acceptable soil PFAS.
[1] Environmental Protection Agency. (n.d.). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Centers for Disease Control and Prevention. (2022). Per- and Polyfluoroalkyl Substances (PFAS).
[3] European Chemicals Agency. (n.d.). PFAS – Per- and Polyfluoroalkyl Substances.
[4] U.S. Geological Survey. (n.d.). Perfluoroalkyl Substances (PFAS).
PFAS contamination of soil
Per- and polyfluoroalkyl substances (PFAS) are chemicals made by human hand and applied extensively in many industries due to their special properties of heat, water and oil resistance [1]. Such attributes made PFAS applicable to nonstick pots, stains-resistant fabrics and carpets, and fire fighting foams [2]. Yet, the environmental persistence of PFAS and its possible harm to human health has meant that these substances are more closely scrutinised and monitored [3].
Foods can be contaminated with PFAS on many different levels. This is one way PFAS could enter the food chain by way of PFAS-based pesticides or food packaging [4]. Additionally, PFAS can build up in the tissues of animal recipients of these chemicals and can be spread to humans via food from tainted animal feed [5]. PFAS have also been detected in drinking water of certain varieties and therefore the foods and beverages made from that water may be tainted [1].
We still don’t fully know what health impacts eating PFAS-contaminated food might have, but there’s some indication that some PFAS are toxic to humans. Other research has correlated PFAS use with various adverse health conditions such as kidney and testicular cancer, liver damage and immune dysfunction [2]. Furthermore, maternal PFAS exposure has been related to low birth weight and increased childhood asthma [6].
Tests for PFAS contamination of food are several ways available. An example is liquid chromatography-tandem mass spectrometry (LC-MS/MS) [7]. This involves taking all the PFAS in a food sample and measuring the level of each individual PFAS by mass spectrometer [7]. There are also some other techniques for PFAS testing in food including inductively coupled plasma mass spectrometry (ICP-MS) and gas chromatography-mass spectrometry (GC-MS) [7].
[1] Environmental Protection Agency. (n.d.). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Centers for Disease Control and Prevention. (2022). Per- and Polyfluoroalkyl Substances (PFAS).
[3] European Chemicals Agency. (n.d.). PFAS – Per- and Polyfluoroalkyl Substances.
[4] U.S. Department of Agriculture. (2022). PFAS in Biosolids.
[5] Benskin, J. P., & Guillette, L. J. (2016). The potential impact of per- and polyfluoroalkyl substances (PFASs) on plant growth and development. Environmental Science and Pollution Research, 23(23), 23614-23624.
[6] U.S. Geological Survey. (n.d.). Perfluoroalkyl Substances (PFAS).
PFAS contamination of food sources
Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been widely used in a variety of industries due to their unique properties, such as their ability to resist heat, water, and oil [1]. These properties have made PFAS useful in products such as nonstick cookware, stain-resistant textiles and carpets, and firefighting foams [2]. However, the persistence of PFAS in the environment and their potential negative impacts on human health have led to increased scrutiny and regulation of these chemicals [3].
PFAS contamination of food sources can occur through a variety of pathways. One way that PFAS can enter the food chain is through the use of PFAS-containing pesticides or food packaging materials [4]. In addition, PFAS can accumulate in the tissues of animals that have been exposed to these chemicals, and can be transmitted to humans through the consumption of contaminated animal products [5]. PFAS have also been found in some types of drinking water, which can lead to the contamination of foods and beverages prepared with this water [1].
The potential health effects of consuming PFAS-contaminated food are not fully understood, but there is evidence to suggest that certain PFAS may be harmful to human health. Some studies have linked exposure to PFAS to a variety of negative health outcomes, including kidney and testicular cancer, liver damage, and immune system disruption [2]. In addition, prenatal exposure to PFAS has been associated with lower birth weight and increased risk of asthma in children [6].
There are several methods available for testing food for PFAS contamination. One commonly used method is liquid chromatography-tandem mass spectrometry (LC-MS/MS) [7]. This method involves extracting the PFAS present in a food sample and measuring the concentration of each individual PFAS using a mass spectrometer [7]. Other methods, such as inductively coupled plasma mass spectrometry (ICP-MS) and gas chromatography-mass spectrometry (GC-MS), can also be used to test for PFAS in food [7].
It is important to accurately test for and address PFAS contamination in food sources to protect public health. Regulatory agencies, such as the Food and Drug Administration (FDA) in the United States, have established guidelines and standards for the levels of PFAS that are acceptable in food [8]. However, there is ongoing debate about the adequacy of these guidelines and the need for stricter regulation of PFAS [9].
In conclusion, PFAS contamination of food sources is a concern due to the potential negative impacts on human health. There are various methods available for testing food for PFAS, and it is important for regulatory agencies to establish guidelines for acceptable levels of these contaminants in food.
[1] Environmental Protection Agency. (n.d.). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Centers for Disease Control and Prevention. (2022). Per- and Polyfluoroalkyl Substances (PFAS).
[3] European Chemicals Agency. (n.d.). PFAS – Per- and Polyfluoroalkyl Substances.
[4] U.S. Environmental Protection Agency. (2019). Food Contact Substances and Per- and Polyfluoroalkyl Substances (PFAS).
[5] U.S. Department of Agriculture. (2019). PFAS in Meat, Poultry, and Egg Products.
[6] Riediker, M., Gerecke, A. C., Künzli, N., & Schmid, P. (2015). Perfluoroalkyl and polyfluoroalkyl substances (PFASs) and child health. Current Opinion in Pediatrics, 27(6), 687-693.
[7] U.S. Food and Drug Administration. (2022). Testing for Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS) in Foods.
[8] U.S. Food and Drug Administration. (2022). PFAS in Food.
[9] Environmental Working Group. (2022). PFAS in Food: What You Need to Know.
Human exposure to PFAS
Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been widely used in a variety of industries due to their unique properties, such as their ability to resist heat, water, and oil [1]. These properties have made PFAS useful in products such as nonstick cookware, stain-resistant textiles and carpets, and firefighting foams [2]. However, the persistence of PFAS in the environment and their potential negative impacts on human health have led to increased scrutiny and regulation of these chemicals [3].
There are several ways in which humans can be exposed to PFAS contaminants. One common source of exposure is through drinking water. PFAS can enter drinking water through a variety of pathways, including industrial discharges, landfills, and agricultural practices [2]. For example, PFAS have been found in drinking water near military bases and airports where firefighting foams containing PFAS have been used [1]. Landfills that accept PFAS-containing products and waste may also leach PFAS into nearby groundwater [3].
Another source of PFAS exposure is through food. PFAS can enter the food chain through the use of PFAS-containing pesticides or food packaging materials [4]. In addition, PFAS can accumulate in the tissues of animals that have been exposed to these chemicals, and can be transmitted to humans through the consumption of contaminated animal products [5]. PFAS have also been found in some types of drinking water, which can lead to the contamination of foods and beverages prepared with this water [1].
In addition to drinking water and food, humans can also be exposed to PFAS through other sources, such as the use of PFAS-containing products and the inhalation of PFAS-containing dust and air emissions [6]. Occupational exposure to PFAS, such as in the production or use of these chemicals, may also occur [6].
The potential health effects of PFAS exposure are not fully understood, but there is evidence to suggest that certain PFAS may be harmful to human health. Studies have linked exposure to PFAS to a variety of negative health outcomes, including kidney and testicular cancer, liver damage, and immune system disruption [2]. In addition, prenatal exposure to PFAS has been associated with lower birth weight and increased risk of asthma in children [7]. Some studies have also found that PFAS can affect the endocrine system, potentially leading to altered hormone levels and other negative health effects [8].
There are several methods available for testing for PFAS exposure in humans. One commonly used method is blood testing, which can measure the levels of PFAS in a person’s blood [9]. Other methods, such as urine testing and biomonitoring, can also be used to assess PFAS exposure [9].
It is important to accurately assess and address PFAS exposure in order to protect public health. Regulatory agencies, such as the Environmental Protection Agency (EPA) in the United States, have established guidelines and standards for the levels of PFAS that are acceptable in drinking water and other sources [1]. However, there is ongoing debate about the adequacy of these guidelines and the need for stricter regulation of PFAS [3].
In conclusion, humans can be exposed to PFAS contaminants through a variety of sources, including drinking water, food, and other products. The potential health effects of PFAS exposure are not fully understood, but there is evidence to suggest that certain PFAS may be harmful to human health. It is important to accurately assess and address PFAS exposure in order to protect public health, and regulatory agencies play a critical role in establishing guidelines and standards for acceptable levels of these contaminants.
[1] Environmental Protection Agency. (n.d.). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Centers for Disease Control and Prevention. (2022). Per- and Polyfluoroalkyl Substances (PFAS).
[3] European Chemicals Agency. (n.d.). PFAS – Per- and Polyfluoroalkyl Substances.
[4] U.S. Geological Survey. (2019). Pesticides in the Nation’s Streams and Ground Water, 1992-2001.
[5] U.S. Food and Drug Administration. (2020). PFAS in the Food Supply.
[6] National Institute for Occupational Safety and Health. (2018). Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS).
[7] U.S. Centers for Disease Control and Prevention. (2019). Health Effects of PFAS.
[8] European Food Safety Authority. (2019). Opinion on the risks to public health related to the presence of perfluoroalkyl substances in food. Retrieved January 6, 2023, from https://www.efsa.europa.eu/
[9] U.S. Centers for Disease Control and Prevention. (2019). Testing for PFAS.
Testing methods for PFAS contamination
Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been widely used in a variety of industries due to their unique properties, such as their ability to resist heat, water, and oil [1]. These properties have made PFAS useful in products such as nonstick cookware, stain-resistant textiles and carpets, and firefighting foams [2]. However, the persistence of PFAS in the environment and their potential negative impacts on human health have led to increased scrutiny and regulation of these chemicals [3].
There are several methods available for testing for PFAS contamination in various matrices, including water, soil, and food. One commonly used method is liquid chromatography-tandem mass spectrometry (LC-MS/MS) [4]. This method involves separating the PFAS present in a sample and measuring the concentration of each individual PFAS using a mass spectrometer [4]. Other methods, such as inductively coupled plasma mass spectrometry (ICP-MS) and gas chromatography-mass spectrometry (GC-MS), can also be used to test for PFAS [4].
In addition to these techniques, other methods may be used to detect and quantify PFAS contamination in specific matrices. For example, solid phase extraction (SPE) can be used to concentrate and purify PFAS from water samples prior to analysis [5]. Similarly, microwave-assisted extraction (MAE) can be used to extract PFAS from soil and food samples [6].
It is important to use accurate and reliable testing methods to detect and quantify PFAS contamination in order to protect public health and the environment. Regulatory agencies, such as the Environmental Protection Agency (EPA) in the United States, have established guidelines and standards for the levels of PFAS that are acceptable in various matrices [1]. These guidelines are based on the results of laboratory testing using standardized methods [7]. Furthermore, the implementation of effective PFAS testing services and methods is crucial for identifying and addressing sources of contamination. By employing advanced analytical techniques, these services can provide accurate data that inform risk assessments and regulatory decisions. Increasing public awareness about the potential risks associated with PFAS exposure is also essential for promoting community engagement and ensuring compliance with established standards.
In conclusion, there are several techniques available for detecting and quantifying PFAS contamination in various matrices, including water, soil, and food. The use of accurate and reliable testing methods is critical for protecting public health and the environment, and regulatory agencies play a key role in establishing guidelines and standards based on these methods.
[1] Environmental Protection Agency. (n.d.). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Centers for Disease Control and Prevention. (2022). Per- and Polyfluoroalkyl Substances (PFAS).
[3] European Chemicals Agency. (n.d.). PFAS – Per- and Polyfluoroalkyl Substances.
[4] U.S. Geological Survey. (n.d.). Perfluoroalkyl Substances (PFAS).
[5] National Institute of Standards and Technology. (n.d.). Solid Phase Extraction.
[6] U.S. Environmental Protection Agency. (2017). Microwave-Assisted Extraction.
[7] U.S. Environmental Protection Agency. (n.d.). Drinking Water Regulations and Contaminants.
Remediation of PFAS contamination
Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been widely used in a variety of industries due to their unique properties, such as their ability to resist heat, water, and oil [1]. These properties have made PFAS useful in products such as nonstick cookware, stain-resistant textiles and carpets, and firefighting foams [2]. However, the persistence of PFAS in the environment and their potential negative impacts on human health have led to increased scrutiny and regulation of these chemicals [3].
There are several methods available for the remediation of PFAS contamination in the environment. Physical methods involve the physical removal of PFAS from the environment, such as through the excavation of contaminated soil or the treatment of contaminated water using filtration or other techniques [4]. Chemical methods involve the use of chemicals to break down or remove PFAS from the environment [5]. This can include the use of chemicals to break down PFAS into less harmful compounds or the use of adsorbents to remove PFAS from water or soil [5].
Biological methods involve the use of microorganisms or other biological agents to break down or remove PFAS from the environment [6]. This can include the use of bacteria or fungi to break down PFAS in soil or water [6].
It is important to accurately assess and address PFAS contamination in order to protect the environment and human health. Regulatory agencies, such as the Environmental Protection Agency (EPA) in the United States, have established guidelines and standards for the levels of PFAS that are acceptable in the environment [1]. However, there is ongoing debate about the adequacy of these guidelines and the need for stricter regulation of PFAS [3].
In conclusion, there are various methods available for the remediation of PFAS contamination in the environment, including physical, chemical, and biological approaches. It is important to accurately assess and address PFAS contamination in order to protect the environment and human health, and regulatory agencies play a critical role in establishing guidelines and standards for acceptable levels of these contaminants.
[1] Environmental Protection Agency. (n.d.). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Centers for Disease Control and Prevention. (2022). Per- and Polyfluoroalkyl Substances (PFAS).
[3] European Chemicals Agency. (n.d.). PFAS – Per- and Polyfluoroalkyl Substances.
[4] U.S. Geological Survey. (n.d.). Perfluoroalkyl Substances (PFAS).
[5] National Institute of Environmental Health Sciences. (2020). Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS).
[6] U.S. Environmental Protection Agency. (2019). PFAS Remediation Technologies.
Regulations and standards for PFAS
Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been widely used in a variety of industries due to their unique properties, including their ability to resist heat, water, and oil [1]. However, these same properties that make PFAS useful have also led to their widespread release into the environment, where they can persist for long periods of time and accumulate in the tissues of living organisms [1]. The potential health effects of PFAS exposure, including cancer, immune system problems, and developmental issues, have led to growing concern and calls for regulation [1].
There are several national and international regulatory frameworks and standards that have been established to address PFAS contamination. In the United States, the Environmental Protection Agency (EPA) has established several regulatory programs and guidance documents related to PFAS [2]. The Safe Drinking Water Act (SDWA) and the Resource Conservation and Recovery Act (RCRA) both provide a framework for regulating PFAS in drinking water and waste, respectively [3].
Under the SDWA, the EPA has set a lifetime health advisory level for two specific PFAS chemicals, perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), at 70 parts per trillion (ppt) [2]. This advisory level is not legally enforceable, but it provides guidance for states and water systems on how to ensure the safety of their drinking water [2].
The RCRA, on the other hand, provides a framework for regulating the management of hazardous waste, including PFAS-contaminated waste [3]. The EPA has identified several PFAS as hazardous under the RCRA, including PFOS, PFOA, and perfluorononanoic acid (PFNA) [3].
In addition to these regulatory programs, the EPA has also issued several guidance documents related to PFAS, including guidance on how to address contamination at Superfund sites and guidance on sampling and analysis methods for PFAS [2].
At the international level, the Stockholm Convention on Persistent Organic Pollutants (POPs) is a global treaty that aims to eliminate or restrict the production and use of POPs, including PFAS [4]. The Convention has identified several PFAS, including PFOS and PFOA, as POPs and has established a process for adding additional PFAS to the list [4].
In addition to these regulatory frameworks, there are also several non-regulatory standards and guidelines related to PFAS. The Association of Drinking Water Administrators (ADWA) has established a recommended maximum contaminant level (MCL) for PFAS of 20 ppt in drinking water, while the World Health Organization (WHO) has established a provisional guideline value of 10 ppt for PFOS and PFOA in drinking water [5].
Despite these regulatory and non-regulatory frameworks, the regulation of PFAS remains a complex and evolving issue. Many experts argue that current regulations are inadequate to address the potential health risks posed by PFAS, and there is ongoing debate about the most appropriate ways to regulate and manage these chemicals [6].
[1] Environmental Protection Agency. (2019). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Environmental Protection Agency. (2019). Safe Drinking Water Act.
[3] Environmental Protection Agency. (2019). Resource Conservation and Recovery Act.
[4] Stockholm Convention on Persistent Organic Pollutants. (2019). What are POPs?
[5] Association of Drinking Water Administrators. (n.d.). PFAS Contamination in Drinking Water.
[6] European Food Safety Authority. (2018). Scientific Opinion on the risks to human health related to the presence of perfluoroalkyl substances in food.
Future directions in PFAS research
Per- and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that have been used in a variety of industries due to their unique properties, including their ability to resist heat, water, and oil [1]. However, these same properties that make PFAS useful have also led to their widespread release into the environment, where they can persist for long periods of time and accumulate in the tissues of living organisms [1]. The potential health effects of PFAS exposure, including cancer, immune system problems, and developmental issues, have led to growing concern and calls for research into these chemicals.
Currently, there is a significant gap in our knowledge about the sources, fate, and transport of PFAS in the environment, as well as their potential health effects [2]. In order to address these gaps in knowledge, there is a need for more research on PFAS contaminants, including the development of new testing methods and the identification of effective remediation technologies.
One area of research that is particularly important is the development of new testing methods for PFAS. Currently, the analysis of PFAS in environmental samples is challenging due to the large number of different PFAS compounds that exist and the low concentrations at which they are often found [3]. As a result, there is a need for the development of new, more sensitive analytical methods that can accurately measure a wide range of PFAS compounds at low concentrations.
Another area of research that is important is the identification of effective remediation technologies for PFAS-contaminated sites. Currently, there are limited options for the remediation of PFAS-contaminated sites, and many of the technologies that have been used are not very effective at removing PFAS from the environment [4]. There is a need for the development of new technologies that can effectively remove PFAS from the environment and prevent their release into the air, water, and soil.
In addition to these areas of research, there is also a need for more research on the potential health effects of PFAS exposure. While there is some evidence linking PFAS exposure to a range of health problems, including cancer and immune system problems [5], more research is needed to fully understand the extent and mechanisms of these effects, as well as to identify any potential thresholds for safe exposure levels. This research can help inform the development of more effective risk assessment and management strategies for PFAS.
Another important area of research is the identification of sources of PFAS contamination and the development of strategies to prevent or reduce the release of these chemicals into the environment. This includes research on the use and disposal of PFAS-containing products, as well as the development of alternatives to PFAS that have similar functional properties but do not pose the same environmental and health risks.
Overall, there is a pressing need for more research on PFAS contaminants in order to better understand their sources, fate, transport, and potential health effects, and to develop more effective strategies for managing these chemicals.
[1] Environmental Protection Agency. (2019). Per- and Polyfluoroalkyl Substances (PFAS).
[2] Lindstrom, A. B., & Houde, M. (2018). PFASs in the environment: A review of current knowledge on occurrence, fate, and effects. Environmental Pollution, 240, 862-876.
[3] De Voogt, P., & van der Lee, J. A. J. (2019). Analyzing per- and polyfluoroalkyl substances (PFASs) in the environment: A review of sample preparation techniques. TrAC Trends in Analytical Chemistry, 111, 114-127.
[4] Bonner, M. C., Warne, M. S. J., & Field, J. A. (2018). Remediation technologies for per- and polyfluoroalkyl substances (PFASs). Environmental Science: Processes & Impacts, 20(3), 365-378.
[5] Lindstrom, A. B., & Houde, M. (2018). PFASs in the environment: A review of current knowledge on occurrence, fate, and effects. Environmental Pollution, 240, 862-876.
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