U.S. Department of Health and Human Services


Date of this Version


Document Type



Journal of the A.O.A.C. (Vol. 45, No.2, 1962).


U.S. government work.


Some organic phosphorus pesticides have been determined successfully by polarography (1-7). However, in most cases the methods were used to determine the pesticide in commercial formulations. Little has been reported on the polarographic determination of microgram amounts of these pesticides such as those encountered in pesticide residue analysis.

Many of the methods used for the determination of these pesticides are nonspecific. They are based on cholinesterase assay (8- 12), radioactive tracer analysis (13, 14), total phosphorus (15-17), and paper chromatography (18-24).

In this paper we will discuss the polarography of Systox, Di-Syston, and· Thimet and some of their oxidation products, and will show that polarography combined with paper chromatography can be used to increase the specificity of analysis of these compounds.