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Degradation of mecoprop at different concentrations in surface and sub-surface soil

✍ Scribed by Reffstrup, Trine K.; Sørensen, Henrik; Helweg, Arne

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
356 KB
Volume
52
Category
Article
ISSN
1526-498X

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✦ Synopsis

Biodegradation of [ring-14C] mecoprop (2-(4-chloro-2-methylphenoxy) propionic acid) was determined in surface and sub-surface soil at concentrations of 0É0005, 0É05, 0É5, 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 6È8 times slower than in surface soil, but the shape of the curves was the same in both layers.

At concentrations between 0É0005 and 0É5 mg kg~1, in both surface and subsurface soil, degradation was initially zero-order followed by Ðrst-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 25 000 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.

1998

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