【摘要】 针对气相色谱法测定有机磷农药残留过程中常见的基线噪声大、活性位点吸附、热分解和基质效应等4个问题,从气相色谱仪的结构和有机磷农药的性质出发,探讨了解决办法。提出从气路故障、检测器、外部干扰等3个方面排查,降低基线噪声;正确使用玻璃衬管和色谱柱,消除活性位点;合理设置进样口和检测器温度,防止发生热分解现象;采用基质净化、基质匹配校准及加入分析保护剂的方法,避免基质效应。更多还原

【Abstract】 According to the structure of gas chromatograph and properties of organophosphorus pesticide,the solutions to common problems in determination of organophosphorus pesticide by gas chromatography,as high baseline noise,adsorption on active points,thermal decomposition and matrix-induced response enhancement were studied.We suggested checking gas path fault,detector and external disturbance to reduce baseline noise;using glass insert and column correctly to eliminate active points;setting the temperature of injector and detector reasonably to prevent thermal decomposition;adopting matrix simplification procedures,matrix-matched calibration standards and analyte protectants to avoid matrix-induced response enhancement.更多还原