连续流动在线UV消解测定海水中的总氮的不确定度评定  

Uncertainty Evaluation in Determination of Total Nitrogen in Seawater by UV Digestion and Flow Injection Spectrophotome

作　　者：曾兴宇 周东星 赵云荣 刘静 ZENG Xing - yu;Zhou Dong - xing;Zhao Yun - rong;Liu Jing(Institute of Seawater Desalination and Multipurpose Utilization, State Oceanic Administration, Tianjin 300192, China)

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192

出　　处：《盐科学与化工》2017年第12期13-17,共5页Journal of Salt Science and Chemical Industry

基　　金：海洋公益性行业科研专项经费项目(201305039);海水淡化与综合利用创新服务平台-膜法海水淡化技术创新服务平台(cxsf2014-34-B);中央级公益性科研院所基本科研业务费专项资金项目(K-JBYWF-2015-G27)

摘　　要：采用连续流动在线UV消解测定海水中的总氮。对测量结果的不确定度进行了评定。分析了测量程序中不确定度的各项来源,包括样品采集、标准溶液制备、校准曲线回归、在线UV消解、样品回收率等分量引入的不确定度及其计算方法,最后合成标准不确定度,通过乘以95%概率下的扩展因子2,获得测量结果的扩展不确定度。Total nitrogen in marine aquaculture wastewater were determined by UV digestion and flow injection spectrophotometry. The sources of uncertainty produced in analysis process were discussed and the volume of sample collection preparation of standard solution, standard curve regres- sion, dilution of sample, sample recovery of the UV digestion process, etc. were considered as the main sources of the measurement uncertainty . And the expanded uncertainty was obtained from syn- thetical standard uncertainty multiplied by expanded factor of 2 under the confidence level of 95%.

关 键 词：连续流动 在线UV消解 海水 总氮 不确定度 

分 类 号：O657.7[理学—分析化学]