Analysis of soils for diclofop‐methyl and diclofop

摘要

AbstractA method is described for the analysis of soils for residues of the herbicide diclofop‐methyl, methyl (RS)‐2‐4‐(2,4‐dichlorophenoxy)phenoxypropionate, and its breakdown product diclofop, (RS)‐2‐4‐(2,4‐dichlorophenoxy)phenoxypropionic acid. Diclofop‐methyl undergoes hydrolysis in the soil to diclofop, which also has herbicidal activity. A procedure, using a 1 phosphoric acid solution for extraction purposes, has been developed and gives good recoveries of both diclofop‐methyl and diclofop at the 0.5 and 0.05 mg kg−1levels. After methylation, gas‐liquid chromatography with electron‐capture detection is used to determine t