动态顶空-气相色谱／离子阱质谱法测定土壤中苯系物

摘要

采用动态顶空进样，气相色谱/离子阱质谱法测定土壤中的苯系物。对样品的吹扫温度、吹扫时间和解析时间进行了优化，各组分的方法检出限：苯为0．43μg/kg，甲苯为1．13μg/kg，对、间二甲苯均为1．74μg/kg，邻二甲苯为0．37μg/kg；对5种苯系物的低、中质量浓度标液进行加标，回收率为82．0％～115％，重复测定7次的RSD为4．8％～15．1％。对某造纸厂周边土壤样品中苯系物进行测定，结果固废堆存处周边土壤中苯和甲苯检出。%A gas chromatography/mass spectrometry coupled with dynamic headspace method was estab-lished for the determination of benzene series in soil .The sweeping temperature ,sweeping time , and desorption time were optimized, and the detection limits were from 0.37 μg/kg~1.74 μg/kg.The low and medium con-centration of blank spike showed the recovery rate were form 82 .0%~115%.The RSDs of seven times′repeti-tive determination ranged from 4 .8%~15 .1%.At the same time , the benzene series in the soil around the pa-per mill were detected using this method and the result was benzene and toluene were detected in the soil around the solid waste piles .