IPC AND CIPC RESIDUE ANALYSIS

Food crops grown in soil treated with IPC (isopropyl-N-phenylcarbamate) and CIPC (isopropyl N-S-chlorophenylcarbamate) are analyzed for residues by the basic alkaline hydrolysis and colorimetric method of Montgomery and Freed. The method is modified to adapt it to the specific crops examined. Modifications include selection of appropriate sample sizes (10 to 200 grams) and hydrolysis medium (acidic or alkaline) to achieve low and reasonable levels of interference with good recovery of residue and physical performance during analytical processing. Recovery of residue from fortified samples ranges from 80 to 120%. The low limit of residue measurement is 0.05 p.p.m. for cranberries employing 200 grams of sample and 2 p.p.m. for sesame seeds employing 10 grams of sample. © 1969, American Chemical Society. All rights reserved.