Table 2.
Mean regression parameters from fitting Tenax desorption data of pyrene in sediments or sediment fractions to a two-phase desorption modela
| Treatment | F rapid | k rapid (1/h) | F slow | k slow (1/h) | r 2 |
|---|---|---|---|---|---|
| Salinas Potrero sediment | |||||
| Sediment | 0.29 ± 0.01 | 5.17 ± 0.67 (×10−2) | 0.70 ± 0.01 | 8.68 × 10−4 ± 6.82 × 10−5 | 0.99 |
| Sand | 0.11 ± 0.02 | 7.75 ± 0.32 (×10−2) | 0.87 ± 0.01 | 4.06 × 10−4 ± 4.62 × 10−6 | 0.99 |
| Silt | 0.15 ± 0.01 | 4.26 × 10−2 ± 7.18 × 10−3 | 0.84 ± 0.01 | 4.57 × 10−4 ± 5.10 × 10−5 | 0.99 |
| Clay | 0.38 ± 0.02 | 3.56 × 10−2 ± 4.74 × 10−3 | 0.60 ± 0.02 | 1.45 × 10−3 ± 1.41 × 10−5 | 0.97 |
| San Diego Creek sediment | |||||
| Sediment | 0.31 ± 0.03 | 1.79 × 10−1 ± 4.15 × 10−2 | 0.67 ± 0.02 | 7.90 × 10−4 ± 1.21 × 10−4 | 0.98 |
| Sand | 0.11 ± 0.02 | 2.35 × 10−1 ± 7.41 × 10−2 | 0.88 ± 0.01 | 6.19 × 10−4 ± 4.46 × 10−5 | 0.99 |
| Silt | 0.26 ± 0.02 | 4.65 × 10−2 ± 1.12 × 10−2 | 0.74 ± 0.02 | 7.67 × 10−4 ± 1.03 × 10−4 | 0.99 |
| Clay | 0.35 ± 0.01 | 3.22 × 10−2 ± 1.10 × 10−3 | 0.64 ± 0.01 | 1.05 × 10−3 ± 2.48 × 10−5 | 0.98 |
a F rapid and F slow are the rapid and slow desorption fractions, respectively, and k rapid and k slow are the corresponding rate constants