【摘要】 建立了电感耦合等离子体发射光谱(ICP-AES)测定糖果中铅的相应数学模型,对数学模型中各个参数进行不确定度来源分析,分别对A类不确定度或B类不确定度进行评定。对各不确定度分量合成和扩展,得到铅质量分数的不确定度。结果表明:标准溶液的配制、标准曲线拟合线性方程及样品溶液的定容是不确定度的主要来源。更多还原

【Abstract】 A mathematic model for evaluating the uncertainty of the determination procedure for lead in candies by ICP-AES was established.The uncertainty sources for each of the parameters in the model were analyzed.The uncertainties of type A(based on the calculation of the statistical distribution of the determination results) or type B(based on the estimation by experience and the probability distribution of other information) were evaluated.According to the international general method,the component uncertainties were synthesized and extended,respectively to obtain the uncertainty evaluation.The results showed that the preparation of standard solutions,the fitted linear regression equation for the calibration curve and the volume of sample solution were the main sources of uncertainties.更多还原