[Aims]A method was established for the analysis and testing of 8 cyclohexenone herbicides and 2 metabolites in soil using ultrasonic assisted extraction and ultra-high performance liquid chromatography tandem mass spectrometry.[Methods]The soil samples were extracted by dichloromethane assisted with ultrasound,purified by aminated multi walled carbon nanomaterials,and separated by C18 chromatography column after solvent conversion,using 5 mmol/L ammonium formate aqueous solution and methanol as mobile phases for gradient elution,with multiple reaction monitoring(MRM)positive ion mode(ESI+)ionization scanning.Quantification was performed using a matrix matching standard curve external standard method.[Results]There was a good linear relationship between 8 cyclohexenone herbicides and 2 metabolites,with correlation coefficients greater than 0.999.The detection limit of the method was 0.01-0.1 μg/kg,with a quantification limit of 0.03-0.3 µg/kg.At the addition levels of high,medium and low blank samples,the average recovery rates of 8 cyclohexenone herbicides and 2 metabolites ranged from 71.81％ to 111.04％ ,with a relative standard deviation(RSD)of 0.46％ to 10.30％ (n=6).[Conclusions]This method is fast,accurate and easy to operate,which is suitable for residual detection of cyclohexenone herbicides and their metabolites in soil.
关键词
氨基化多壁碳纳米管/液相色谱串联质谱/土壤/环己烯酮/除草剂
Key words
aminated multi walled carbon nanotube/liquid chromatography tandem mass spectrometry/soil/cyclohexenone/herbicide
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