污泥中pH值测定不确定度的评定

Evaluation of Uncertainty in Determination of pH Value in Sludge

本文以玻璃电极法测定污泥中pH值为实例,确立了pH值测定不确定度数学模型,从而进行pH值测定不确定度来源的分析及计算,分析了污泥中pH值测定不确定度的主要影响因素是制备试样溶液和仪器测量。同时通过对模拟污泥样进行测定,得到pH测得值为6.88,其扩展不确定度为0.10。

Through the example of pH value in sludge by glass electrode method in this paper,the mathematical model of uncertainty in determination of pH value is established.Based on sources of analysis and calculation of uncertainty in determination of pH value,the main influence factors of uncertainty in determination of pH value in sludge are preparation of sample solution and instrument measurement.And through the determination of the simulated sludge sample,the pH value is 6.88,its expanded uncertainty is 0.10.