Determination of Chlorophenoxy Herbicides in Plant Material Exposed to Spray Drif

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Abstract
A method is described for the determination of five commonly used chlorophenoxy herbicides in plant material. These are mecoprop (2''-(4-chloro-2-methyl phenoxy) propionic acid), dicamba (2,-methoxy-3, 6-dichloro benzoic acid), MCPA ((2, methyl-4-chlorophenoxy) acetic acid), 2,4-D ((2,4-dichlorophenoxy) acetic acid), and 2,4,5-T ((2,4,5-trichlorophenoxy) acetic acid). The method is applied to the analysis of ornamental tree leaves affected by spray drift derived from aerial spraying of chlorophenoxy herbicides. The compounds are extracted from macerated leaf tissue with acidified acetone and derivatized with pentafluorobenzyl bromide. The pentafluorobenzyl esters are then cleaned up using minicolumns containing Florisil prior to analysis by gas chromatography with electron capture detection.