In order to improve the extraction efficiency of diuron in soil and to detect its residues more accurately,pressurized solvent extraction was used as the extraction method for diuron in soil,and a new method for the extraction and detection of diuron in soil was established by using ultra performance liquid chromatography-triple quadrupole tandem mass spectrometry.The sample was freeze-dried and loaded into a pressurized solvent extractor,and a methanol-dichloromethane mixture was used as the extractant.The extract was cleaned up by a Carb/PSA graphitized carbon black/ethylenediamine-N-propyl solid phase extraction column,and then separated by a C18 column with a gradient elution of methanol-dichloromethane mixture at a volume ratio of 1 ∶ 9.The electron bombardment ion source and multiple reaction were selected in the mass spectrometry monitoring mode.The results showed that there was a good linear relationship within the range of 20-500 μg·L-1 diuron,with a correlation coefficient of 0.999 5,and the target peak separation effect is good.The spiked recoveries of diuron were 71.2%-90.3%,the relative standard deviations were 1.7%-9.4%,and the detection limits were 0.000 287 0 μg·g-1.This method is conducive to the operation of large-scale detection of diuron residues in soil,improving the extraction and detection efficiency of target substances,and improving the accuracy of sample detection.
diuronpressurized solvent extractionliquid mass spectrometrypesticide residues
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NSTL
维普
万方数据
