快速溶剂萃取–气相色谱–质谱法测定土壤中苯胺类化合物

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建立快速溶剂萃取(ASE)–气相色谱–质谱(GC–MS)法测定土壤中苯胺、邻硝基苯胺、间硝基苯胺、对硝基苯胺、二硝基苯胺5种苯胺类化合物的方法.样品经丙酮–二氯甲烷混合溶剂(体积比为1:1)提取,用硅酸镁小柱净化,经无水硫酸钠脱水,氮吹浓缩至1.0 mL,用GC–MS法测定,外标法定量.5种苯胺类化合物的质量浓度在0.2~2.0μg/mL范围内与特征离子色谱峰面积具有良好的线性关系,相关系数均不小于0.995,方法检出限为0.7~5.7μg/kg.当空白土壤样品加标质量分数分别为60、140μg/kg时,苯胺回收率为51.0%~64.2%,其余4种硝基苯胺的回收率为68.0%~121.5%,测定结果的相对标准偏差为1.2%~7.4%(n=6).该方法适用于低含量苯胺类化合物的土壤测定.
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