碘酸钾滴定法测定钽铁、铌铁精矿中锡量的不确定度评定

Evaluation of uncertainty for determination of tin content in potassium iodate titration method of tantalite, columbite concentrate

对碘酸钾滴定法测定钽铁、铌铁精矿中锡量的不确定度进行了评估,建立了数学模型,认为测量过程中不确定度主要来源于重复性实验,样品制备与分取,标准溶液配制与分取,滴定管及实验人员读数估计产生的不确定度.当锡的平均含量为4.55%时,评定其扩展不确定度为0.05%(k=2).

The measurement uncertainty of t in determination results for tantalite,columbite concentrate by potassium iodate titration method was evaluated and the mathematical model of uncertainty was also established. The measurement uncertainty originated from the sub-uncertainties of repetitive experiments, sample preparation, preparation of standard solution,burrete and the volume estimination from the experimental persons. When the average concentration of Sn in samples was 4.55%, the expanded uncertainty was 0.05%（k=2）.