土壤和沉积物中持久性有机污染物分析的不确定度评估

摘要

There were four necessary steps in persistent organic pollutants analysis of soil and sediment, which was: sampling, transportation and preservation, preparation, and analysis. The sources of uncertainty in the entire course of the determfining p,p'-DDT in soil and sediment with qual, homogeneity, ASE, multi -layer column cleaning, GC- MS were evaluated. The predominant uncertainty of 90.6％ was from sample preparation, the others from sampling, transportation and preservation, and analysis were 5.4％, 2.1％ and 1.9％ respectively.%土壤和沉积物中POPs分析过程中的不确定度来源于样品制备、运输和保存、前处理和分析4个环节.土壤经四分法采样、均质化制样、快速溶剂萃取、多层符合硅胶柱净化、GC/MS分析.以p,p'-DDT为例,评定了各环节不确定度的大小,结果表明:样品前处理的不确定度分量对合成不确定度的贡献最大,约占90.6%;样品制备、保存和分析环节的贡献分别为5.4%、2.1%、1.9%.