重铬酸钾滴定法测定植物有机碳含量的不确定度评估  

Evaluation of Uncertainty in Determination of Organic Carbon Content in Plants by Potassium Dichromate Titration

作　　者：王多伽[1] 张鑫[1] 刘丽宅 骆红 刘笑笑[1] 金香淑[1] Wang Duojia;Zhang Xin;Liu Lizhai;Luo Hong;Liu Xiaoxiao;Jin Xiangshu(Jilin Academy of Agricultural Sciences,Key laboratory of Beef Cattle Genetics and Breeding,Ministry of Agriculture and Rural Affairs,P.R,Jilin Provincial International Joint Research Center for Meat Herbivirous Livestock Production Technology,Changchun 130033,China)

机构地区：[1]吉林省农业科学院,农业农村部肉牛遗传育种重点实验室,吉林省肉用草食家畜生产技术国际联合研究中心,吉林长春130033

出　　处：《山东化工》2023年第6期137-140,144,共5页Shandong Chemical Industry

基　　金：吉林省农业科技创新工程项目(编号:CXGC2021ZYD123);吉林省科技厅技术创新引导项目(编号:20220404009NC)。

摘　　要：通过分析植物中有机碳测定过程中不确定度来源,评定各不确定度分量,建立重铬酸钾滴定法检测植物中有机碳不确定度评估方法。结果表明:采用重铬酸钾滴定法测定植物中有机碳,各不确定度因素影响顺序为,滴定>重复性检测>硫酸亚铁溶液标定>试样称量,合成不确定度为8.581 375 g/kg,扩展不确定度为17.162 7 g/kg,植物中有机碳检测结果:(481.05±17.16)g/kg(k=2,P=95%)。植物有机碳检测中,试样滴定是不确定度产生的主要来源,其次是重复性检测。An uncertainty evaluation method for the measurement of organic carbon in plants by potassium dichromate titration was established by analyzing the sources of uncertainty in the measurement of organic carbon in plants and evaluating each uncertainty component.The result showed that by adopting potassium dichromate titration to determine organic carbon in plants,the order of influence of each uncertainty factor was titration>repeatability detection>ferrous sulfate solution calibration>sample weighing,the synthetic uncertainty was 8.581375 g/kg,the expanded uncertainty was 17.1627 g/kg,the determination result of plant organic carbon content was(481.05±17.16)g/kg(k=2,P=95%).The uncertainty of titration introduction is the first main source of uncertainty in determination of organic carbon in plants,while the second main source is repeatability detection.

关 键 词：不确定度 滴定法 有机碳 植物 

分 类 号：O655.2[理学—分析化学]