. Author manuscript; available in PMC: 2008 Dec 8.

Published in final edited form as: Environ Sci Technol. 2006 Jan 1;40(1):289–295. doi: 10.1021/es051381p

Table 2.

Method accuracy as indicated by the average recovery for analytes spiked into Milli-Q water (n = 10) and into single samples of raw influent (raw influent field matrix spikes) and final effluent (final effluent field matrix spikes) collected from ten different WWTPs.^a

Analyte	Milli-Q water^b (%)	Raw Influent (%)	Final Effluent (%)
PFBS	98	100	100
PFHxS	88	98	95
PFOS	91	95	88
PFDS	92	94	92
6:2 FtS	97	97	95
PFHxA	91	88	93
PFHpA	94	92	89
PFOA	97	92	95
[1,2-¹³C₂]PFOA	93	88	89
PFNA	88	92	89
PFDA	91	90	86
FOSA	87	82	92

Because single samples of ten different influents and effluents were analyzed, the variability of the average recovery (2%) was determined by two-factor analysis of variance (ANOVA).

Endogenous concentrations in raw influent and effluent were subtracted to determine spike recovery and are available in Table 3.

Milli-Q water samples (n=10) were spiked with analytes in the laboratory and sealed during transport and not opened until analysis.