FLUOROMETRIC AND COLORIMETRIC PROCEDURES FOR DETERMINING RESIDUES OF BENOMYL

Methods for determining benomyl, methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate, residue in plant and animal tissues and in soil involve isolation of the residue by extraction with an organic solvent, purification of the extract by a liquid-liquid partitioning procedure, conversion of the residue to 2-aminobenzimidazole, and final determination by direct fluorometric measurement or colorimetric analysis following bromination. Each method has a sensitivityof 0.1 p.p.m. based on a 50-gram sample. Average recoveries of about 87% have been obtained on all samples investigated, using both the fluorometric and colorimetric methods. © 1969, American Chemical Society. All rights reserved.