石墨炉原子吸收法测定考核盲样中镉的不确定度评定  

Uncertainty evaluation for graphite furnace atomic absorption method applied to determining cadmium in blind sample

作　　者：李敏[1] 郭蒙京[1] 王紫纹[1] 

机构地区：[1]北京市西城区疾病预防控制中心,北京100120

出　　处：《医疗卫生装备》2016年第9期106-109,共4页Chinese Medical Equipment Journal

摘　　要：目的:采用石墨炉原子吸收法,对不同浓度的样品中镉的含量进行测定,为定量评价测量结果的质量提供依据。方法:采用石墨炉原子吸收分光光度计,分别测定2个考核盲样中镉的含量,建立不确定度评定数学模式,系统分析和量化影响不确定度的各因素。结果:k=2(置信概率95%)时,得出不同浓度2个样品测定的扩展不确定度分别为9.2和28μg/kg。结论 :该评定方法合理反映了盲样考核测定值的置信度,可为测定不同浓度中镉时的不确定度分析提供参考。Objective To apply graphite furnace atomic absorption method to detecting the cadmium in the samples with different concentrations to lay a foundation for quantitative evaluation.Methods Graphite furnace atomic absorption spectrometer was used to measure cadmium in two pieces of blind samples,so that uncertainty evaluation model could be established to analyze and quantify the factors influencing the uncertainty.Results In case k value was 2（confidence probability being 95%）,the expanded uncertainties of the two samples were 9.2 and 28 μg/kg respectively.Conclusion The assessment method reflects the confidence degree properly,and provides references for analyzing cadmium in concentrations of samples.

关 键 词：考核盲样 石墨炉原子吸收法 不确定度 镉 

分 类 号：O657.31[理学—分析化学]