土壤样品中碱解氮测定不确定度评定  

Uncertainty evaluation of measurement results for determination of alkaline-N in soil

作　　者：蔡玉曼[1] 彭磊[1] 常青[1] 陈美芳[1] 李海敏[2] 

机构地区：[1]江苏省地质调查研究院,江苏南京210018 [2]江苏出入境检验检疫局,江苏南京210001

出　　处：《地质学刊》2012年第2期212-215,共4页Journal of Geology

摘　　要：通过容量法测定土壤样品中碱解氮,重复测定11次,计算实验标准差,同时对测试过程系统效应产生的不确定度分量进行评估。经评定,不确定度主要由盐酸标准溶液标定、样品重复性试验和样品制备所产生。当土壤样品中碱解氮质量分数为58.4、73.4、95.1、169mg/kg时,其扩展不确定度分别为2.0、2.4、3.4、5.0mg/kg。测定不确定度越小,用测定值表示真值的可靠性越高。Alkaline-N in soil was determined through volumetric method for 11 times, standard deviation was calculated and uncertain- ty assessment was evaluated in experiment testing process system at the same time. Uncertainty was generated by hydrochloric acid cali- bration, sample repeatability tests and sample preparation. When the content of alkaline-N in soil samples reached 58.4, 73.4, 95.1 and 169 mg/kg, its extending uncertainty was 2. 0, 2.4, 3.4 and 5.0 mg/kg, respectively.

关 键 词：容量法 土壤 碱解氮 不确定度评定 

分 类 号：X833[环境科学与工程—环境工程]