紫外分光光度法测定地下水中硝酸根的不确定度评定  

Evaluation of the Uncertainty in Determination of Nitrate Radical in Groundwater by Ultraviolet Spectrophotometry

作　　者：刘建坤[1] 朱家平[1] 郑荣华[1] 

机构地区：[1]南京地质矿产研究所,南京210016

出　　处：《现代科学仪器》2012年第3期79-82,共4页Modern Scientific Instruments

基　　金：国土资源部公益性行业科研专项资助(NO.200811133)

摘　　要：采用不确定度连续传递模型,对紫外分光光度法测定地下水中硝酸根的不确定度进行了评定。测量结果的不确定度主要来源于标准溶液引入的不确定度、曲线拟合产生的不确定度和测量过程引入的不确定度三部分,摩尔质量、样品体积产生的不确定度较小,可以忽略不计。采用双误差对标准曲线进行拟合,利用STDCURVE软件可以直接得到测量结果在95%置信度时的扩展不确定度。Uncertainty of the determination of nitrate radical in groundwater by ultraviolet spectrophotometry was evaluated using Continuous Propagation Model of Uncertainty. The main sources of uncertainty came from calibration solution, calibration curve and the measurement process. Uncertainty of molar mass and sample volume were ignored because of their less contribution. The regression of double error was used in the course of standard curve fitting.The extended uncertainty of measurement was obtained from STDCURVE software under 95% confidence level.

关 键 词：紫外分光光度法 硝酸根 不确定度评定 双误差回归 

分 类 号：X832[环境科学与工程—环境工程] O657.32[理学—分析化学]