稳定性同位素稀释气相色谱-质谱法测定金枪鱼中多氯联苯的不确定度评定
Journal of Shandong University(Natural Science)(2013)
Abstract
鱼肉制品中多氯联苯的测定步骤复杂,分析结果与真实值之间往往存在一定的出入。本文采用稳定性同位素稀释气相色谱-质谱法对金枪鱼中多氯联苯的含量进行测定,并对整个测试过程的不确定度来源进行系统分析。以PCB28(Polychlorinated Biphenyl 28)为分析对象,对测试过程中引入的不确定的各个分量进行评定与合成,当PCB28测定结果为17.7 ng/g时,扩展不确定度为1.9 ng/g,k=2,p=95%。较为全面地评定了测量结果不确定度的影响因素,并提出了金枪鱼中多氯联苯测定质量控制的改进方法。
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Key words
polychlorinated biphenyls(PCBs),tuna,Gas Chromatography-Mass Spectrometry(GC-MS),uncertainty
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