A mass spectrometric method in the negative ion chemical ionization mode was used to analyze #x3B1;- and #x3B2;-endosulfan in biological samples. The selected ion recording technique was employed, monitoring the ions at m/z 35 and 37. Biological samples of animals treated with endosulfan were analyzed. The method is selective and sensitive enough to analyze crude extracts of mouse brain and plasma directly without purification, since the chromatograms were clean
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