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  

Uncertainty estimation in determination of polychlorinated biphenyls in tuna by stable isotope dilution gas chromatography-mass spectrometry

作　　者：申中兰[1] 袁东[2] 王茂森[1] 脱英英[3] 张红霞[1] 盛建伟[1] 张卉[1] 祝建华[1] 

机构地区：[1]山东省产品质量监督检验研究院,山东济南250100 [2]齐鲁师范学院化学系,山东济南250013 [3]山东轻工业学院学生处,山东济南250353

出　　处：《山东大学学报（理学版）》2013年第5期34-38,共5页Journal of Shandong University(Natural Science)

基　　金：山东省质量技术监督局项目(2009KY13)

摘　　要：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。Existing methods for analyzing PCBs in animal muscle require multiple and laborious steps prior to quantitation.In this paper,a method for determination of Polychlorinated Biphenyls（PCBs） in tuna by Stable Isotope Dilution Gas Chromatography-Mass Spectrometry（GC-MS） has been proposed.Uncertainty source of the method has been analyzed systematically.By analyzing of standard material PCB28,the uncertainty factors of testing process were evaluated and synthesized.When the result for the determination of PCB28 was 17.7 ng/g,the expanded uncertainty was 1.9 ng/g,k=2,p=95%.This paper evaluated comprehensively the predominant influences on the uncertainty,some methods used to improve the quality control were also discussed.

关 键 词：气相色谱-质谱法 金枪鱼 多氯联苯 不确定度 

分 类 号：O657.63[理学—分析化学]