DEQ-CFW_00070874

METHOD 537
DETERMINATION OF SELECTED PERFLUORINATED ALKYL ACIDS IN
DRINKING WATER BY SOLID PHASE EXTRACTION AND LIQUID
CHROMATOGRAPHY/TANDEM MASS SPECTROMETRY (LC/MS/MS)
1. SCOPE AND APPLICATION
1.1 This is a liquid chromatography/tandem mass spectrometry (LC/MS/MS) method for
the determination of selected perfluorinated alkyl acids (PFAAs) in drinking water.
Accuracy and precision data have been generated in reagent water, and finished
ground and surface waters for the compounds listed in the table below.
Analyte
Acronym
Chemical Abstract Services
Registry Number (CASRN)
N-ethyl perfluorooctanesulfonamidoacetic acid
NEtFOSAA
—
N-methyl perfluorooctanesulfonamidoacetic acid
NMeFOSAA
—
Perfluorobutanesulfonic acid
PFBS
375-73-5
Perfluorodecanoic acid
PFDA
335-76-2
Perfluorododecanoic acid
PFDoA
307-55-1
Perfluoroheptanoic acid
PFHpA
375-85-9
Perfluorohexanesulfonic acid
PFHxS
355-46-4
Perfluorohexanoic acid
PFHxA
307-24-4
Perfluorononanoic acid
PFNA
375-95-1
Perfluorooctanesulfonic acid
PFOS
1763-23-1
Perfluorooctanoic acid
PFOA
335-67-1
Perfluorotetradecanoic acid
PFTA
376-06-7
Perfluorotridecanoic acid
PFTrDA
72629-94-8
Perfluoroundecanoic acid
PFUnA
2058-94-8
1.2 The Minimum Reporting Level (MRL) is the lowest analyte concentration that meets
Data Quality Objectives (DQOs) that are developed based on the intended use of this
method. The single laboratory lowest concentration MRL (LCMRL) is the lowest true
concentration for which the future recovery is predicted to fall, with high confidence
(99%), between 50 and 150% recovery. Single laboratory LCMRLs for analytes in
this method range from 2.9-14 ng/L, and are listed in Table 5. The procedure used to
determine the LCMRL is described elsewhere.I
537-2
DEQ-CFW 00070874