Abstract
Abstract A gas chromatographic method is described for determining Monitor (0,S-dimethyl phosphoramidothioate) in a variety of crops. After extraction of the sample with ethyl acetate, the solvent is evaporated and an ether solution of the residue is passed through a silica gel column to remove interferences. Monitor is then eluted from the column with acetone and measured by gas chromatography, using a cesium bromide thermionic detector. The majority of standard recovery values ranged between 90 and 100% when samples were fortified at 0.05 to 0.1 ppm.
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