Table 1.
T90 values and decay rates for all targets, averaged among all agrochemical treatmentsa
| Microcosm, target, and matrix | Decay rate (change in concn/no. of days) |
T90 (h)b | |
|---|---|---|---|
| T0 to T24 | T0 to T168 | ||
| Dark microcosm | |||
| E. coli | |||
| Water | −0.16 (1.1) | 0.11 (1.7) | NA |
| Sediment | −0.51 (1) | −0.07 (1.2) | NA |
| Enterococci | |||
| Water | 0.87 (0.6) | 0.58 (0.9) | 21 |
| Sediment | 0.02 (0.7) | 0.19 (1.4) | NA |
| E. coli O157:H7 | |||
| Water | −0.39 (0.8) | 0.03 (1) | NA |
| Sediment | −0.61 (0.7) | −0.09 (1) | NA |
| S. enterica | |||
| Water | 0.24 (1.8) | 0.33 (2.3) | NA |
| Sediment | −0.19 (1) | 0.09 (1.8) | NA |
| HPyV | |||
| Water | −0.12 (0.3) | 0.15 (0.4) | NA |
| Sediment | −0.15 (0.2) | 0.00 (0.2) | NA |
| Adenovirus | |||
| Water | −0.03 (0.2) | 0.09 (0.4) | NA |
| Sediment | 0.08 (0.1) | 0.01 (0.1) | NA |
| Light microcosm | |||
| E. coli | |||
| Water | −0.02 (0.4) | −0.50 (0.7) | NA |
| Sediment | −0.28 (0.9) | −1.59 (0.8) | NA |
| Enterococci | |||
| Water | 2.98 (1.6) | 5.05 (1) | 9 |
| Sediment | 0.30 (0.9) | 1.34 (1.9) | NA |
| E. coli O157:H7 | |||
| Water | −0.84 (1.9) | −1.24 (1.7) | NA |
| Sediment | −0.91 (1.5) | −1.93 (1.8) | NA |
| S. enterica | |||
| Water | −1.26 (3.4) | 0.64 (5.3) | NA |
| Sediment | −1.36 (3.1) | −1.00 (4) | NA |
a
Data are presented for both matrices in both dark and light microcosms. Values in parentheses are standard deviations.
b
NA, not applicable.