TABLE 1.
Activity measurements after 48 days of treatment at different temperaturesa
| Treatment | Total petroleum hydrocarbon concn in soil (μg/g of soil [dry wt]) | Heterotrophs (MPN, 106)b | Hydrocarbon degraders (MPN, 106) |
|---|---|---|---|
| Start (day 0) | 907 (87)c | 23 (16) | 2.3 (1.2) |
| Killed control | 754 (40) | NDd | ND |
| −5°C | 974 (67) | 93 (40) | 1.5 (1.2) |
| 0°C | 701 (14) | 210 (190) | 4.3 (1.1) |
| 7°C | 426 (30) | 33 (16) | 3.6 (1.2) |
| 7 and −5°C | 290 (31) | 120 (40) | 9.3 (1.2) |
a
Values are means (n = 3) with standard deviations in parentheses.
b
MPN, most probable number.
c
n = 15.
d
ND, not determined.