【摘要】 利用乙腈提取、氧化铝和弗罗里硅土填料净化的前处理方法,研究了采用毛细管气相色谱同时测定苹果、梨中氯氰菊酯、联苯菊酯和氟氯氰菊酯残留量的方法。结果表明,用20mL10%丙酮/石油醚作为淋洗液,0.5mg·L-1水平时苹果、梨在两种填料的回收率都在90%—120%之间;在0.05mg·L-1水平时,苹果、梨在弗罗里硅土柱上,3种菊酯都达到了90%—110%的满意结果;而在氧化铝柱上,只有联苯菊酯和氟氯氰菊酯达到90%—110%的结果,氯氰菊酯只达到64.8%和61.5%的结果。综合考虑,利用弗罗里硅土柱对这3种菊酯的净化效果较好,高低浓度均符合农药残留分析的要求。更多还原

【Abstract】 A rapid method for determination of residues of cypermethrin, bifenthr in and cyfluthrin in apple and pear by capillary gas chromatography was develope d. The sample was extracted with acetonitrile and cleaned-up with Florisil colu mn and aluminia column, respectively, with acetone/petroleum ether (9:1, V/V) as the effluent in this experiment. In both columns, the recoveries of the pestici des from apple and pear fortified samples were between 90% and 120% at 0.5 mg ·L-1 level. While at 0.05 mg·L-1 level, the recoveries of bifenthrin, cyflut hrin and cypermethrin in apple and pear from Florisil column obtained 90% — 110%. However, only the recoveries for bifenthrin and cyfluthrin were quantita tive for alumina column, that of cypermethrin was just in a range of 64.8% to 6 1.5%.更多还原