Degradation of mecoprop at different concentrations in surface and sub-surface soil
1998
Reffstrup, T.K. | Sorensen, H. | Helweg, A.
Biodegradation of [ring-14C] mecoprop (2-(4-chloro-2-methylphenoxy) propionic acid) was determined in surface and sub-surface soil at concentrations of 0.0005, 0.05, 0.5, 5, 50, 500, 5000 and 25 000 mg kg-1. The kinetics of mineralisation were evaluated from the mineralisation rates as a function of time and by non-linear regression analysis. In the sub-surface soil, degradation was 6-8 times slower than in surface soil, but the shape of the curves was the same in both layers. At concentrations between 0.0005 and 0.5 mg kg-1, in both surface and sub-surface soil, degradation was initially zero-order followed by first-order kinetics. At 5 to 500 mg kg-1 in surface soil and 5 to 50 mg kg-1 in sub-surface soil the degradation rate was initially either constant or decreasing followed by exponential degradation indicating increasing populations of mecoprop decomposers in the soil. At 5000 and 25000 mg kg-1 in the surface soil and at 500, 5000 and 25 000 mg kg-1 in the sub-surface soil, the degradation was negligible, as determined by the percentage [14C] carbon dioxide evolved. By non-linear regression, the three-half order model was found to describe the mineralisation.
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