煤灰成分中Al_(2)O_(3)测定结果的不确定度评定

Evaluation of uncertainty in the determination of Al_(2)O_(3) in coal ash composition

分析了利用氟盐取代EDTA络合滴定法测定煤灰成分中Al_(2)O_(3)测定结果不确定度的来源,对各标准不确定度分量进行了评定,在此基础上合成标准不确定度,最终确定扩展不确定度后报出测定结果。所测试样按照文中方法评定的煤灰成分中Al_(2)O_(3)测量结果为:w_(Al_(2)O_(3))=(29.53±0.44)%,k=2。

The sources of uncertainty in the determination of Al_(2)O_(3) in coal ash using fluoride salt instead of EDTA complexometric titration were analyzed,and the standard uncertainty components of each source were evaluated.Based on this,the standard uncertainty was synthesized,and the extended uncertainty was finally determined before reporting the determination results.The evaluated result of Al_(2)O_(3) in the coal ash composition according to the method in the text is:w_(Al_(2)O_(3))=(29.53±0.44)%,k=2.