硫酸钡比浊法测定水中硫酸盐的不确定度评估

Evaluation of Measurement Uncertainty in Determination of Sulfate in Drinking Water by the Barium Sulfate Turbidimetric Method

目的分析和评估硫酸钡比浊法测定水中硫酸盐含量的不确定度。方法依据测量不确定度评定与表示(JJF1059-1999),建立数学模型,得出测定硫酸盐的合成不确定度和扩展不确定度。结果水中硫酸盐的合成不确定度为0.33mg/L,扩展不确定度为0.7mg/L。结论通过对硫酸钡比浊法测定水样中硫酸盐含量不确定度的来源分析,找出影响测量结果的各种因素,计算不确定度分量及合成不确定度,有效掌握了测量结果的可信程度和准确性,保证检测工作和检测结果的质量。

Objective Analysis and evaluation of measurement uncertainty in determination of sulfate in drinking water by barium sulfate turbidity. Methods Based on the evaluation of measurement uncertainty and expresses （JJF1059-1999）, establishes the mathematical model, obtains the determination sulfate the synthesis uncertainty and the expansion uncertainty. Results tn the water the sulfate synthesis uncertainty is： 0.33 mg/L, the expansion uncertainty is： 0.7 mg/L. Conclusion Through to the barium sulfate turbidimetric method determination water sample in the sulfuric acid salt content uncertainty source analysis, discovers the influence measurement result each kind of factor, the computation uncertainty component and the synthesis uncertainty, has effectively grasped the measurement result credible degree and the accuracy, guaranteed the quality of the surveillance and the result.