水中COD_(mn)测量不确定度的评定

Evaluation of the Uncertainty Determination of COD_(mn) in Water Sample

建立了用高锰酸钾氧化法测定水中CODmn测定的不确定度数学模型,通过对测量重复性、滴定管、移液管、标准溶液浓度等影响,测量结果的不确定度分量的分析和量化,求得扩展不确定度。

This paper establishes a mathematical model of uncertainty measurement to determine the proportion of CODmn in water by means of potassium permanganae oxidation. Through the analysis of Measurement repeatability, burette, pipette and standard solution concentration, this paper also quantizes the measuring results of uncertainty components, and obtains the expanded uncertainty.