Improved methods for extraction, cleanup, and gas chromatographic analysis have been developed for determination of dichlorvos (2,2-dichlorovinyl dimethyl phosphate, DDVP) in foods.The methods have been used to determine the residues absorbed by food exposed to dichlorvos concentrations used in in-flight disinsection of aircraft. Whole meals exposed for 30 min to 0.25 µg/l. of dichlorvos absorbed approximately 0.18 ppm. Approximately Vio of this concentration was found in beverages similarly exposed, while concentrations in margarine were three times as high. The method is sensitive to 0.005 ppm of dichlorvos.A system for disinsection of aircraft in flight by the use of vapors of dichlorvos (2,2-dichlorovinyl dimethyl phosphate, DDVP) has been described by Jensen et al. (1965). The system was installed in a commercial DC-6B passenger aircraft and tested on scheduled flights in the Caribbean area in 1963. Complete kill of mosquitoes and houseflies was observed when exposed in flight for 30 min at concentrations of 0.13-0.25 µg/l. of dichlorvos. Since that time the above system with modifications has been in-
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.