电镀废水总氮测定不确定度的评定

Evaluation of Uncertainty in Determination of Total Nitrogen in Electroplating Wastewater

分析用碱性过硫酸钾消解紫外分光光度法测试电镀废水经处理后排放水总氮,查找不确定度来源,对各不确定度分量进行评定,并计算出合成不确定度。分析得出对不确定度贡献最大的主要分量是校准曲线测定引入的不确定度,其次为样品测定重复性引入的不确定度。

The ultraviolet spectrophotometry method was used to measure the total nitrogen discharged from electroplating wastewater after treatment.The source of uncertainty was studied,the uncertainty components were evaluated,and the combined uncertaintywas calculated.It was concluded that the uncertainty introduced by the calibration curve measurement and the uncertainty introduced by the repeatability of the sample measurement,were the main components contributing to the combined uncertainty.