The fate of herbicide 14C- clodinafop-propargyl (CfP) was studied for 28 days in lab assays using soil and sediment-water system from Germany. Mineralization was 12.4% and 5.0% of applied 14C, respectively after 28 days. In soil, bioavailable fractions decreased rapidly to 4.4% (28 days). Subsequent extraction released 26.2%, non-extractable portion was 65.0%. In the sediment-water system, 14C in water decreased moderately to 18.5% after 28 days; 35.6% were extracted from sediment, 34.0% remained non-extractable. TLC, HPLC and GC/MS analysis revealed rapid cleavage of CfP to acid clodinafop (Cf). In soil, DT50 values were below 1 (CfP) and about 7 days (Cf), in sediment-water, below 1 and 28 days, respectively. TLC pointed to 2-(4-hydroxyphenoxy)-propionic acid as further metabolite in soil. Non-extractable 14C was associated with all organic fractions. Microorganisms growing on CfP as sole carbon source were isolated and identified by 16S rDNA sequence analysis as Rhodococcus wratislaviensis and Nocardiopsis aromaticivorans.

Metabolic fate of clodinafop-propargyl in a soil and a sediment-water system

248th National Meeting (2014)

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