Table 1.
PFAS detected in groundwater and monitored in pilot system.
| Compound | Abbreviation | Chain-length | Concentration ± 2 S.D. (ng/L)c | ||
|---|---|---|---|---|---|
| #C a | #CF2 b | Linear | Branched Isomers d | ||
| Perfluorocarboxylic Acids (PFCA) | |||||
| Perfluoropropanoic acid | PFPrA | 3 | 2 | 435.0 ± 126.6 | n.d. |
| Perfluorobutanoic acid | PFBA | 4 | 3 | 914.6 ± 92.7 | n.d. |
| Perfluoropentanoic acid | PFPeA | 5 | 4 | 59.1 ± 8.5 | 9.3 ± 3.4 |
| Perfluorohexanoic acid | PFHxA | 6 | 5 | 44.3 ± 4.6 | 8.7 ± 1.2 |
| Perfluoroheptanoic acid | PFHpA | 7 | 6 | 6.0 ± 0.8 | 2.3 ± 0.3 |
| Perfluorooctanoic acid | PFOA | 8 | 7 | 14.5 ± 1.9 | 6.1 ± 1.4 |
| Perfluorosulfonic Acids (PFSA) | |||||
| Perfluoroethane sulfonic acid | PFEtS e | 2 | 2 | 24.1 ± 13.1 | n.d. |
| Perfluoropropane sulfonic acid | PFPrS | 3 | 3 | 95.4 ± 20.6 | n.d. |
| Perfluorobutane sulfonic acid | PFBS | 4 | 4 | 130.4 ± 18.3 | 2.7 ± 0.6 |
| Perfluoropentane sulfonic acid | PFPeS | 5 | 5 | 82.9 ± 10.7 | 11.4 ± 3.2 |
| Perfluorohexane sulfonic acid | PFHxS | 6 | 6 | 48.2 ± 7.7 | 28.0 ± 3.9 |
| Perfluorheptane sulfonic acid | PFHpS | 7 | 7 | 0.9 ± 0.2 | 2.1 ± 0.6 |
| Perfluorooctane sulfonic acid | PFOS | 8 | 8 | 1.5 ± 0.4 | 1.3 ± 0.2 |
| Perfluorosulfonamides (FASA) | |||||
| Perfluorobutane sulfonamide | FBSA | 4 | 4 | 3.5 ± 1.2 | n.d. |
| Perfluorohexane sulfonamide | FHxSA | 6 | 6 | 0.8 ± 0.4* | n.d. |
n.d. – not detected.
a
Number of carbons in compound including functional group.
b
Number of perfluorinated carbons in compound including CF3 tail.
c
Average concentration measured in pilot influent throughout duration of test (n=34, ± 2 standard deviations).
d
Branched isomer concentrations were estimated based on linear standards, except for PFHxS and PFOS.
e
PFEtS concentration was estimated based on PFPrS calibration.
*
Compound was not tracked for breakthrough in pilot due to low concentration.