Simultaneous Determination of Five Common Triazene Herbicides in Edible Fungus Planting Soil by Gas Chromatography Tandem Mass Spectrometry

The research on the determination of triazene herbicide residues involves a single type of herbicide at present, which could not comprehensively examine the level of trace triazene herbicide residues in soil. Therefore, the study mentioned by title was done. The pre-treated sample (10.0 g) was taken, and about 12 g of diatomite was added. After mixing well, the mixture was extracted at 80 ℃ for 10 min according to the set accelerated solvent extraction procedure. The extraction solution was purified by gel permeation chromatography, and the eluent was blown to near dryness at 50 ℃ by nitrogen. The residue was dissolved by 1 mL of a mixture of acetone and ethanol at a volume ratio of 1∶2. Five herbicides in the filtrate, including simazine, cyanazine, atrazine, ipramazine, and oxalazine, were simultaneously determined by gas chromatography tandem mass spectrometry (GC-MS/MS). As shown by the results, linear relationships between values of peak area and mass concentration of five herbicides were found in the range of 0.01-5.0 mg·L^-1. with detection limits (3S/N) ranged from 0.010 to 0.014 mg·kg^-1. Test for recovery was made by standard addition method, giving results in the range of 84.6%-103%. The 0.1 mg·L^-1 blank soil sample was parallel determined 6 times, with RSDs of the determined values less than 3.0%. The method was applied to the analysis of soil samples from actual edible fungus planting soil samples, with detection amounts of 0.015, 0.011 mg·kg^-1 for atrazine and 0.020 mg·kg^-1 for chlorpyrifos, respectively.