电感耦合等离子体原子发射光谱法测定石英砂中铝、钙、铁含量的不确定度评定  

Uncertainty evaluation for the determination of aluminium,calcium and iron content in quartz sand by inductively coupled plasma atomic emission spectrometry

作　　者：孙改华 薛宁 康少杰 路晓涛 SUN Gaihua;XUE Ning;KANG Shaojie;LU Xiaotao(Chinalco Test Science&Technology(Zhengzhou)Co.,Ltd.,Zhengzhou 450041,China;Zhengzhou Non-ferrous Metals Research Institute Co.,Ltd.of CHALCO.,Zhengzhou 450041,China)

机构地区：[1]中铝检测科技(郑州)有限公司,郑州450041 [2]中铝郑州有色金属研究院有限公司,郑州450041

出　　处：《化学分析计量》2024年第6期117-121,共5页Chemical Analysis And Meterage

基　　金：国家科技部重点研发计划(2022YFC2904400)基金项目;广西科技重大专项(2023AA12005)。

摘　　要：对电感耦合等离子体原子发射光谱法测定石英砂中铝、钙、铁含量的不确定度来源进行了分析,建立了数学模型,对测量过程中样品的称量、标准曲线的变动性、标准溶液、样品溶液的体积、测量的重复性等引起的不确定度分量进行了合理的评定,计算出石英砂中铝、钙、铁的含量分别为:(0.091±0.0014)%、(0.0035±0.00036)%、(0.0055±0.00026)%。从评定结果可以看出,标准工作曲线的变动性、测试重复性对不确定性影响最大。因此在实际工作中,维护好设备的稳定性、选取合适浓度梯度的标准曲线、多次测量可以有效提高测量结果的准确性。The causes of uncertainty for quantitative determination of aluminium,calcium and iron in quartz sand by inductively coupled plasma atomic emission spectrometry(ICP-AES)were discussed.The mathematical model was established to quantify the uncertainties caused by the sample weighing,standard curve linear regression,standard solution,volume of sample solution,repeatability of measurement.The contents of aluminum,calcium,and iron in quartz sand alculated were(0.091±0.0014)%,(0.0035±0.00036)%,and(0.0055±0.00026)%respectively.The results showed that the standard curve linear regression and measurement repeatability made the greatest contribution to the overall uncertainty.Therefore,maintaining the stability of equipment,selecting standard curves with appropriate concentration gradient and parallel repetitive measurements can effectively improve the accuracy of measurement results.

关 键 词：电感耦合等离子体原子发射光谱法 石英砂 铝 钙 铁 测量不确定度 

分 类 号：O657.6[理学—分析化学]