Determination of dithiocarbamates pesticide residues in edible fungi by gaschromatography-mass spectrometry with solvent absorption

Abstract

Objective To establish a method for determination of dithiocarbamates (DTCs) pesticide residue in edible fungi by gas chromatography-mass spectrometry (GC-MS) with solvent absorption. Methods DTCs pesticide residues in samples were decomposed to carbon disulfide (CS2) by SnCl2-HCl solution under heating condition, the liberated CS2 was absorbed by hexane and then determined by GC-MS. Results Accuracy and precision were assessed by adding CS2 standard solution in edible fungi at three concentration levels (0.025, 0.05 and 0.25 mg/kg). The average spiked recoveries were in the range of 94.8%-109%. The relative standard deviation of precision was from 3.7%-5.5% (n=3). The limits of detection were 0.01 mg/kg and the limits of quantitation were 0.02 mg/kg. Conclusion The method is simple, accurate and reliable. It can be applicable to determination of DTCs pesticide residue in edible fungi.

Keywords

• gaschromatography-mass spectrometry
• dithiocarbamates
• pesticide
• edible fungi
• solvent absorption