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建立生姜、红薯、土豆、荔枝中多菌灵、吡虫啉、涕灭威、三唑酮、乙草胺、苯醚甲环唑的液相色谱-串联质谱检测方法。样品经乙腈溶液提取,50 mg N-丙基乙二胺吸附剂、25 mg十八烷基键合硅胶(C_(18))净化,C_(18)色谱柱分离,0.1%甲酸溶液-甲醇作为流动相进行梯度洗脱,在电喷雾正离子电离模式下,质谱多离子监测模式定量分析,基质标准曲线外标法定量。结果表明,6种农药在10~500μg/L范围内呈良好的线性关系,相关系数(r)均大于0.995。3个加标水平下,6种农药的平均回收率为87.9%~110.3%,相对标准偏差不大于14.6%。该方法简单、快速、灵敏度高,能够满足小宗作物农药残留的监控要求。
To establish a method for the determination of carbendazim, imidacloprid, aldicarb, triadimefon, acetochlor and difenoconazole in ginger, sweet potato, potato and lychee by liquid chromatography-tandem mass spectrometry. The samples were extracted with acetonitrile, 50 mg N-propyl ethylenediamine adsorbent, 25 mg octadecyl-bonded silica gel (C 18), and separated on a C 18 column with 0.1% formic acid-methanol Mobile phase gradient elution in the electrospray positive ionization mode, mass spectrometry multi-ion monitoring mode quantitative analysis, matrix standard curve external standard method. The results showed that there was a good linear relationship between the six pesticides in the range of 10 ~ 500 μg / L and the correlation coefficients (r) were all greater than 0.995. The average recoveries of the six pesticides ranged from 87.9% to 110.3% The relative standard deviation is not more than 14.6%. The method is simple, rapid and sensitive, and can meet the monitoring requirements of pesticide residues in small crops.