Simultaneous gas chromatographic-mass spectrometric quantitation of the alkylbenzene inert components, pesticide manufacturing by-products and active ingredient in two malathion formulations.
A rapid, reliable and effective method for direct determination of the inert components, manufacturing by-products of the pesticide, and active ingredient in two malathion formulations has been established using capillary gas chromatography-mass spectrometry (GC-MS) with the internal standard method. The C2-, C3-, and C4-alkylbenzenes, the major pesticide manufacturing by-products (O,O,S-trimethylthionophosphate, diethyl maleate and O,O,O-trimethylthionophosphate), and malathion were resolved, and quantified in the same chromatogram. Structural identification was based on MS total ion current data, comparison of GC retention times with those of authentic standards, and retention indices. O,O,S-Trimethylthionophosphate was quantified at 3.57 +/- 0.31% (w/w) in one malathion formulation. While the malathion contents were within specifications for both formulations, the total alkylbenzene contents were not.
Department of Environmental Health Sciences, UCLA School of Public Health 90095-1772, USA.
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D000465:Algorithms; D001555:Benzene Derivatives / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D007202:Indicators and Reagents; D008294:Malathion / Q000032:analysis*
D001555:Benzene Derivatives; D007202:Indicators and Reagents; D008294:Malathion