建立了在线净化/固相萃取(SPE)-高效液相色谱(HPLC)快速、准确测定饮用水和环境水体中的两种痕量除草剂百草枯和敌草快的方法.样品用大体积自动进样器注入在线净化小柱并流经固相萃取小柱,通过双梯度高效液相色谱系统中的上样泵实现净化和富集后,通过阀切换将固相萃取小柱切换至分析流路中;用分析泵将待测物从富集柱冲洗至分析柱进行测定.上样泵流速和分析泵流速分别为0.7和0.6 mL/min,采用等度洗脱方式完成两种除草剂的分离和检测.检测波长分别为260 nm(百草枯)和311 nm(敌草快),进样体积为2.5 mL,整个分析时间为16 min.该方法在1.0～ 20 μg/L范围内线性关系良好,两种除草剂的线性相关系数均大于0.998 0,检出限分别为0.10和0.12 μg/L(S/N=3).该方法前处理简单,快速,可用于饮用水和环境水体中痕量除草剂的测定.
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