【摘要】 为探索食品检验制样均匀性对检测结果分散性的影响,以原子荧光法检测小白菜中砷为例,采集了一组四分取样过程中取舍的样品并测得其数据,用单因素方差分析法检验出样品间的均匀性存在差异,算得其相对不确定度为10-2量级,此量级与常占主要地位的曲线拟合浓度的不确定度、回收率及方法偏差不确定度的量级相当。表明制样均匀性不确定度是非均匀性食品样品测量不确定度的主要来源之一,在评估非均匀性食品样品测量不确定度时不可忽视制样环节均匀性的影响。更多还原

【Abstract】 To explore the influence of homogeneity in sample preparation on the test dispersion,As detecting in pakchoi by atomic fluorescence method was studied.Data from a group of samples reserved or deleted by the process of quartering method.The differences of homogeneity between the samples were analyzed by the one-factor variable method.The result of uncertainty magnitude was of 10-2.The relative uncertainty of the differences is the same as the uncertainty of dominant concentration curve,percentage of recovery and method bias uncertainty.Hence,the results show that,the uncertainty of homogeneity sample mainly generates the measurement uncertainty of heterogeneity food samples.The influence of homogeneity coming from sample preparation cannot be ignored in the evaluating of uncertainty of heterogeneity food samples.更多还原