【摘要】 目的建立GB/T 601-2016《化学试剂标准滴定溶液的制备》重铬酸钾标准滴定溶液[c（1/6K2Cr2O7）=0.1mol/L]浓度测量的不确定度评定方法。方法通过对不确定度来源分析,建立测量模型,对制备过程中各不确定度的分量进行分析评估,计算扩展不确定度。结果通过计算各变量的不确定度分量,得到本次标定浓度的相对标准不确定度为1.71×10^-4mol·L^-1,合成标准不确定度为1.7×10^-5mol·L^-1,扩展不确定度U=0.0001 mol·L^-1,包含因子k=2。结论建立了重铬酸钾标准滴定溶液浓度的测量不确定度评定方法,通过评估分析各分量的不确定度的大小而明确影响测量不确定度的主要因素,优化实验条件使测定结果更加准确可靠。更多还原

【Abstract】 Objective To evaluate for the uncertainty of the concentration of potassium dichromate standard titration solution（0.1mol/L）prepared and calibrated according to the method in the GB/T 601-2016 Chemical reagent-Preparations of reference titration solutions.Methods According to the sources of uncertainty analysis,the measurement model was established and the various influencing factors in the calibration process was evaluated to calculate the expanded uncertainty.Results By calculating each fraction of uncertainty in various variable parameters,the relative standard uncertainty was 1.71×10^-4mol·L^-1,the combined uncertainty was 1.7×10^-5mol·L^-1,and the expanded uncertainty was 0.0001 mol·L^-1,coverage factor k=2.Conclusion The method of the uncertainty evaluation for calibrating the concentration of potassium dichromate standard titration solution is established.The more reliable results of the measurement could be obtained when the measure was optimized by magnitude analysis all uncertainty.更多还原