MULTIRESIDUE PESTICIDE DETERMINATIONS WITH A SIMPLE PHOTOCONDUCTIVITY HPLC DETECTOR

A simple postcolumn photoconductivity detector (PCD) was constructed and shown to be applicable to several classes of pesticides, especially a broad range of herbicides. In some cases, solvent mixture and/or photolysis coil material affected detector response. Measurement of ionic photoproducts by ion chromatography demonstrated the source of the detector response. This detector was easily constructed, and estimated detection limits for several pesticides were similar to those of a commercial PCD. Application of the simple PCD to multiresidue pesticide in soils and feeds was demonstrated. © 1990, American Chemical Society. All rights reserved.