土壤有机质含量测定的不确定度评定  

Evaluating Uncertainty in Determination of Soil Organic Matter

作　　者：张晓娟[1,2] 汪聪慧[1,2] 范中南[1,2] 黄金丽[1,2] 

机构地区：[1]中国农业科学院农业环境与可持续发展研究所,北京100081 [2]农业部农业环境与气候变化重点开放实验室,北京100081

出　　处：《现代科学仪器》2011年第4期62-65,共4页Modern Scientific Instruments

摘　　要：本文以土壤有机质含量测定为例,依据化学分析中不确定度评估指南,详细阐述了其不确定度评定过程,即建立不确定度评定的数学模型及主要不确定度来源的确定,如测量的重复性、标准物质的纯度和摩尔质量、称量和定容体积、移液管、滴定管和温度等,对各不确定分量的量化,分别计算各不确定度分量的标准不确定度和相对不确定度分量,以得到测量结果的标准不确定度。结果表明影响不确定度测量的关键因素,如测量重复性的改善,将是提高测试水平的方向。Taking the determination of soil organic matter as an example,the evaluation process is described exhaustively in this paper.Based on the guide to the evaluation of uncertainty in analytical measurement,the evaluation included the following process,namely,setting up a mathematical model,discerning the sources affecting measurement result,such as the repeatability,the purity and molar mass for standards,weighting,constant volume,pipette buret,temperature etc.,quantifying each subcomponent of uncertainty,calculating the combined standard uncertainty,and determining and expressing the expanded uncertainty.The result showed that the key factors affecting uncertainty measurement,such as measurement repeatability,would be the way to elevate the testing level in future

关 键 词：土壤 有机质 测量不确定度 

分 类 号：X53[环境科学与工程—环境工程]