Comparison of Langmuir sorption parameters of sterile soils with corresponding non-sterile soils.

Results are shown as mean (standard error).Qmax and k values followed by different letters in parenthesis between non-sterile and sterile soils within a compound and soil order is statistically significant at P≤0.05. Only one soil type per order is compared, so the Qmax and k of non-sterile soils do not match with that in Table 2.NA = Not determined.