氢化物无色散原子荧光光度计法测定多金属矿物中铋不确定度评定

Evaluation Minerals of by Uncertainty in Determination Hydride Generation Atomic of Bismuth in Polymetallic Fluorescence Spectrophotometry

通过建立数学模型，探讨氢化物无色散原子荧光光度计法测定多金属矿物中铋量的多种不确定度影响因素；计算其测量结果的不确定度分量；对合成标准不确定度和扩展不确定度进行评定。结果表明：测量不确定度主要由测量液制备过程使用的器具和标准曲线拟合过程构成。采用国家标准物质GBW07163进行实验测量评定不确定度，取置信水平为95％，其测定值为76．75±1μg／g（K=2），结果符合测试规范要求。

s Through establishing the mathematical model, the various factors affecting uncertainty for the determination of bismuth content in polymetallic minerals was discussed by hydride generation non-dispersion atomic fluorescence spectrophotometry. The components of the uncertainty of measurement result were calculated. The uncertainty of synthetic standard and expanded uncertainty were evaluated.The results showed that The uncertainty of measurement is mainly composed of the instrument used in the preparation of the measuring fluid and the fitting process of the standard curve. The uncertainty was evaluated by the national standard material GBW07163. The measured value is 76.75±1μg/g （K=2） at a confidence level of 95%, and the results meet the requirements of test specification.