Table 1.
Comparison of 4-week-derived sampling rates (Rs, in mL day−1) derived from the Field’s Point and Buckling Point waste water treatment plants (WWTPs), and across Narragansett Bay.
| Fields Point WWTP | Bucklin Point WWTP | Bay | ||||
|---|---|---|---|---|---|---|
| Rs (mL day−1) | ± SE | Rs (mL day−1) | ± SE | Rs (mL day−1) | ± SE | |
| PFBA | 3.4 | 1.3 | 10 | 7.8 | 13 | 4.2 |
| PFPeA | 10 | 3.6 | 11 | 1.9 | 14 | 4.2 |
| PFHxA | 16 | 5.2 | 14 | 3.1 | 12 | 2.3 |
| PFHpA | 21 | 6.7 | 17 | 4.1 | 16 | 3.3 |
| PFOA | 20 | 7.6 | 20 | 3.2 | 14 | 3.6 |
| PFNA | 15 | 5.4 | 28 | 4.0 | 23 | 7.0 |
| PFDA | 16 | 5.7 | 28 | 4.7 | 28 | 9.9 |
| PFBS | 21 | 9.5 | 16 | 5.2 | 16 | 4.3 |
| PFPeS | 33 | 12.4 | 2.9 | 3.9 | N/A | N/A |
| PFHxS | 25 | 7.9 | 15 | 10 | 26 | 6.6 |
| PFHpS | 17 | 4.2 | 17 | 5.5 | N/A | N/A |
| PFOS | 29 | 14.5 | 17 | 3.6 | 37 | 8.1 |
| 6:2-FTS | 34 | 15.9 | 27 | 15.4 | N/A | N/A |
| N-Me FOSAA | 10 | 8.5 | N/A | N/A | 34 | 8.3 |
| EtFOSAA | 13 | 4.7 | N/A | N/A | 29 | 13 |
| Average | 20 | 8.0 | 18 | 5.4 | 23 | 6.4 |
SE – standard error; N/A – not available
Rs were derived from eq. (2).
WWTP sampling rates were derived relative to daily composite water samples, while Narragansett Bay sampling rates were derived relative to average of two (deployment and retrieval) grab samples.