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PFAS Testing in Drinking Water

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The New Jersey Department of Environmental Protection's Bureau of Safe Drinking Water has published a detailed guidance document for the collection of samples being analyzed for PFAS in drinking water systems.

PFAS Sampling Information For Water Systems Performing Sample Collection

In May of 2016, the US EPA issued health advisories for perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) of 70 ng/L for either PFOA or PFOS individually or combined. In order to limit adverse effects on human health, the EPA is working with other federal agencies, states and local communities to limit the exposure of harmful levels of PFAS. This includes creating a certification program with laboratories that standardize the methods used to detect low levels of PFAS in drinking water, assessing PFAS occurrence nationwide and establishing maximum contaminant levels (MCLs). EPA encourages those interested to be specific with prospective laboratories about the type of PFAS analysis they want performed for drinking water samples. Eurofins has dedicated facilities and instrumentation that minimizes the possibility of cross contamination from other samples and matrices that may contain high levels of contamination to ensure your confidence in low level PFAS and other potable water analyses.

Targeted Analytes

Eurofins performs targeted PFAS analysis by EPA Method 537 v1.1, EPA method 537.1, or by our proprietary method. Each of these methods uses Solid Phase Extraction (SPE) with liquid chromatography tandem mass spectrometry (LC-MSMS). Eurofins maintains four dedicated instruments specifically for these methods. The EPA methods have identical sampling, preservation, and holding time requirements (Table 1). Method 537.1 is almost identical to method 537 v1.1 with four more parameters added and some additional quality control /quality assurance (QA/QC) requirements. Our proprietary method measures 21 additional compounds for a total of 39 PFAS analytes. The parameters analyzed by these methods, including CAS numbers and Minimum Reportable Limits (MRL) achieved by Eurofins are given in Table 1.

Non-Targeted Analytes

In addition to the targeted PFAS, Eurofins can also perform non-targeted PFAS analysis by accurate mass high resolution LCMS. Non-targeted analysis differs from targeted analysis because you  do not know beforehand the exact compounds you are looking for. This technique measures exact mass of molecules and can help identify chemicals previously unknown. Non-targeted analyses are not routine, and can be run on extracts from the Eurofins proprietary method. In addition, direct aqueous injection is possible for the more polar PFAS compounds with 10 carbons (C-10) or less. Please consult your Eurofins sales representative before requesting a non-targeted PFAS analysis.

PFAS Compound List and Analytical Method - Table 1

Analyte Acronym CAS # UCMR3 (537) 537 v1.1  537.1 Proprietary Method MRL, ng/L
Perfluorobutanoic acid PFBA 375-22-4       X 5
Perfluoropentanoic acid PFPeA 2706-90-3       X 2
Perfluorohexanoic acid PFHxA 307-24-4   X X X 2
Perfluoroheptanoic acid PFHpA 375-85-9 X X X X 2 (10)
Perfluorooctanoic acid PFOA 335-67-1 X X X X 2 (20)
Perfluorononanoic acid PFNA 375-95-1 X X X X 2 (20)
Perfluorodecanoic acid PFDA 335-76-2   X X X 2
Perfluoroundecanoic acid PFUnA 2058-94-8   X X X 2
Perfluorododecanoic acid PFDoA 307-55-1   X X X 2
Perfluorotridecanoic acid PFTrDA 72629-94-8   X X X 2
Perfluorotetradecanoic acid PFTeDA 376-06-7   X X X 2
Perfluorohexadecanoic acid PFHxDA 67905-19-5       X 2
Perfluorobutanesulfonic acid PFBS 375-73-5 X X X X 2 (90)
Perfluoropenanesulfonic acid PFPeS 2706-91-4       X 2
Perfluorohexanesulfonic acid PFHxS 355-46-4 X X X X 2 (30)
Perfluoroheptanesulfonic acid PFHpS 375-92-8       X 2
Perfluorooctanesulfonic acid PFOS 1763-23-1 X X X X 2 (40)
Perfluorononanesulfonic acid PFNS 68259-12-1       X 2
Perfluorodecane sulfonic acid PFDS 335-77-3       X 2
Perfluorododecane sulfonic acid PFDoS NA       X 2
N-ethyl perfluorooctanesulfonamidoacetic acid NEtFOSAA 2991-50-6   X X X 2
N-methyl perfluorooctanesulfonamidoacetic acid NMeFOSAA 2355-31-9   X X X 2
Perfluorooctane sulfonamide PFOSA 754-91-6       X 2
N-ethylperfluorooctane sulfonamidoethanol NEtFOSE 1691-99-2       X 2
N-methylperfluorooctane sulfonamidoethanol NMeFOSE 24448-09-7       X 2
N-ethylperfluorooctane sulfonamide NEtFOSA 4151-50-2       X 2
N-methylperfluorooctane sulfonamide NMeFOSA 31506-32-8       X 2
4:2 Fluorotelomer sulfonic acid 4:2 FTS 757124-22-4       X 2
6:2 Fluorotelomer sulfonic acid 6:2 FTS 27619-97-2       X 2
8:2 Fluorotelomer sulfonic acid 8:2 FTS 39108-34-4       X 2
10:2 Fluorotelomer sulfonic acid 10:2 FTS 120226-60-0       X 2
Perfluoro-2-proxypropanoic acid GenX (HFPO-DA for 537.1) 13252-13-6     X X 5 (2 for 537.1)
Dodecafluoro-3H-4,8-dioxanonanoic acid ADONA 958445-44-8 919005-14-4 (537.1)     X X 2
9-chlorohexadecafluoro-3-oxanonane-1-sulfonate F-53B Major 9Cl-PF3OUdS (537.1) 73606-19-6   756426-58-1 (537.1)     X X 2
11-chloroeicosafluoro-3-oxanonane-1-sulfonate F-53B Minor 11Cl-PF3OUdS (537.1) 83329-89-9   63051-92-9 (537.1)     X X 2
Perfluoro-4-methoxybutanoic acid PFMOBA 863090-89-5       X 5
Perfluoro-3-methoxypropanoic acid PFMOPrA 377-73-1       X 5
Perfluoro-2-methoxyethoxyacetic acid PFMOEOAA 151772-58-6       X 5
Perfluoro-4-isopropoxybutanoic acid PFIpOBA 80212-59-9       X 5
Perfluoro-2-methoxyacetic acid PFMOAA 674-13-5       X 5
Perfluoro (3,5-dioxahexanoic) acid PFO2HxA 39492-88-1       X 5
Perfluoro (3,5,7-trioxaoctanoic) acid PFO3OA 39492-89-2       X 5
Perfluoro (3,5,7,9-tetraoxadecanoic) acid PFO4DA 39492-90-5       X 5
Nafion Byproduct 1 Nafion BP1 29311-67-9       X 5
Nafion Byproduct 2 Nafion BP2 749836-20-2       X 5

() MRL for UCMR3

Sampling, Sample Preservation, and Holding Times

Method Test Containers Temperature Preservative Holding Time
Proprietary PFAS targeted and non-targeted 2- 250 ml polypropylene with polypropylene caps ≤ 10°C for first 48 hours ≤ 6°C after 48 hours 1 milliliter of 1.25 N Nitric Acid 28 Days
537 V1.1 PFAS 2 – 250 ml polypropylene with polypropylene ≤ 10°C for first 48 hours ≤ 6°C after 48 hours 1.25 grams Trizma 14 days to extraction 28 days after extraction (extracts stored at room temperature)

For more information on sampling and sample preservation, refer to Eurofins Eaton Analytical PFAS Sampling Instructions.