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Metabolism of Planavin Herbicide in a Lactating Cow

Pesticide Residue Laboratory, Department of Entomology, Cornell University, Ithaca, New York 14850

ABSTRACT

Planavin [4-(methylsulfonyl)-2,6-dinitro-n,n-dipropylaniline] herbicide was fed to a catheterized lactating dairy cow at 5 ppm in the feed ration for four days. Planavin or possible sulfur-containing metabolites were not detected in milk, urine, or feces by electron affinity and sulfur-flame photometric gas chromatographic analysis. The sulfur detector showed that the herbicide rapidly (15 min) decomposed in fresh rumen fluid with production of three sulfur-containing metabolites speculated to be 4-(methylsulfonyl)-2,2-diamino-n,n-dipropylaniline, 4-(methylsulfoxyl)-2,6-diamino-n,n-dipropylaniline and 4-(thiomethyl)-2,6-diamino-n,n-dipropylaniline.