土壤全氮半微量凯氏法测定的不确定度评定  

Uncertainty evaluation for the determination of total nitrogen in soil by semimicro-kjeldahl method

作　　者：郝冠军[1] 

机构地区：[1]上海市园林科学研究所,上海200232

出　　处：《上海农业学报》2014年第4期101-106,共6页Acta Agriculturae Shanghai

基　　金：上海辰山植物园科研专项(G102402)

摘　　要：对半微量凯氏法测定土壤全氮进行不确定度评定,并分析了该方法中不确定度的来源。各来源项的相对标准不确定度显示,在标定盐酸标准溶液、滴定过程和滴定重复3个过程中引入的不确定度程度比较高,这对人员操作能力提出了更高的要求。The factors affecting the uncertainty for the measurement of total nitrogen in soil by semimicro-kjeldahl method were analyzed and assessed in detail.The results showed that three meas-ured steps may lead to the higher uncertainty of measurement,including hydrochloric acid standard so-lution,titration process and repetitive titration.Therefore,the more experience of experimental skills were required to reduce the determination uncertainties.

关 键 词：测量不确定度 不确定度评定 土壤全氮 半微量凯氏法 

分 类 号：S151.9[农业科学—土壤学]