ICP-AES法测定金饰品中铜、铁、锌含量的不确定度评定  

Evaluation of Uncertainty in Measurement of Copper,Iron and Zinc in Golden Jewelry by ICP-AES Method

作　　者：张凤霞[1,2] 刘化峰[1,2] 王岳[1,2] 燕菲[1,2] 

机构地区：[1]国家黄金钻石制品质量监督检验中心,山东济南250014 [2]山东省计量科学研究院山东省计量检测重点实验室,山东济南250014

出　　处：《黄金科学技术》2012年第5期67-70,共4页Gold Science and Technology

基　　金：国家质检总局科技计划(质量技术监督)项目"首饰中有害杂质的检测研究"(编号:2011QK226);山东省质量技术监督局科研项目"饰品中有害物质的关键指标控制"(编号:2010KYZ13)联合资助

摘　　要：采用湿法消解样品,建立电感耦合等离子体发射光谱(ICP-AES)测定黄金饰品中铜、铁和锌元素含量的方法。该方法具有简便、快速、灵敏度高及重现性好等优点。根据测量原理,建立了该方法的定量数学模型并推导出不确定度计算公式,找出了该检测过程中的不确定度来源,对各不确定度分量进行了合成和扩展,得到了铜、铁和锌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重复测量是不确定度的主要来源,黄金饰品中铜、铁和锌的质量分数可分别表示为(10.42±1.54)、(10.79±1.21)和(26.89±1.88)mg/kg。Using wet digestion sample,a method was developed for determination of copper,iron and zinc elements in golden jewelry by ICP-AES method.The method has the advantages of accurate,simple,sensitive and rapid. Based on the measuring principle, the calculation formula was deduced, some data were collected in the procedure of analyzing the golden sample and the various uncertainties in measurement were calculated.According to the international general method,the component uncertainties were synthesized and extended,respectively to obtain the uncertainty evaluation.The results showed that the sources of uncertainty were comprised of sample weighing, the preparation of standard solutions, the fitted linear regression equation for the calibration curve and the repeated determination of copper, iron and zinc concentration in golden jewelry decomposed solution.The combined standard uncertainty and expanded uncertainty of copper,iron and zinc concentration were showed （10.42±1.54）, （ 10.79±1.21） and （26.89±1.88） mg/kg respectively.

关 键 词：电感耦合等离子体-原子发射光谱法 黄金饰品 铜 铁 锌 不确定度 

分 类 号：O657.31[理学—分析化学]