Page 21 - Application Notebook - PFAS Analysis

Application No. C184
News

Accuracy and Precision of the seven replicates and the results of accuracy and
precision evaluation expressed as percentage recovery
The initial demonstration of accuracy and precision and relative standard deviation (RSD). The recoveries
was carried out using seven replicate LCMS-grade obtained using the LCMS-8045 and LCMS-8050 were
water blanks fortified with each PFAS at 60 ng/L (ppt). all within ± 20% of the true value, meeting the criteria
Table 7 shows the average measured concentrations listed by EPA.

Table 7. Accuracy (% Recovery) and precision (% RSD) of target PFAS at 60 ng/L for LCMS-8045 and LCMS-8050
LCMS-8045 LCMS-8050

Compound
Average Conc. % Recovery % RSD Average Conc. % Recovery % RSD
(ng/L), n = 7 (ng/L), n = 7

PFBS 52 87 13 54 90 6

4:2FTS^ 54 90 13 56 94 8

PFHxA 52 87 12 52 87 9

PFPeS^ 54 90 14 54 90 9

PFHpA 53 88 16 52 87 10

PFHxS 54 89 13 54 90 8

6:2 FTS^ 55 92 15 55 92 9

PFOA 52 86 14 53 88 11

PFHpS^ 54 90 13 53 89 9

PFOS 53 89 17 51 85 12

PFNA 51 86 16 64 107 21

8:2 FTS^ 51 86 19 56 93 9

PFNS^ 54 89 15 55 92 11

PFDA 52 87 13 52 87 10

N-MeFOSAA 53 88 15 53 88 9

N-EtFOSAA 54 90 15 56 93 10

PFDS^ 52 86 17 53 89 9

PFUnA 51 85 11 53 88 10

PFDoA 51 86 14 51 85 9

PFTriA 49 82 14 51 85 9

PFTreA 49 82 14 49 81 8

^Additional PFAS compounds not listed in EPA Method 537.