分光光度法测定水中总磷的不确定度评定  

Evaluation of Uncertainty in Determination of TP in Water by Spectrophotometry

作　　者：刘萍 Liu Ping(Kunming Guandu Branch Bureau of Ecology and Environment Ecological Environment Monitoring Station,Kunming 650300,China)

机构地区：[1]昆明市生态环境局官渡分局生态环境监测站,云南昆明650300

出　　处：《云南化工》2022年第11期62-65,共4页Yunnan Chemical Technology

摘　　要：为了提高总磷检测的准确性,降低不确定度,控制产生不确定度大的因素。根据CNAS GL006《化学分析中不确定度的评估指南》和GB11893-89《水质总磷的测定钼酸铵分光光度法》,对水中总磷进行了不确定度评定,得出该样品总磷的不确定度为0.71±0.02 mg/L,k=2。由不确定度分量值大小得出工作曲线的绘制、拟合,重复性试验环节产生的不确定度影响较大。In order to improve the accuracy of TP detection,reduce the uncertainty and control the factors that produce large uncertainty,according to CNAS GL006 Evaluation Guide of uncertainty in Chemical Analysis and GB11893-89 Determination of TP in Water Ammonium Molybdate Spectrophotometric Method,the uncertainty of TP was analyzed and evaluated,and the sample of TP uncertainty report was 0.71±0.02 mg/L,k=2.The uncertainty component can be used to draw and fit the working curve,and the uncertainty introduced by repeatability test has great influence.

关 键 词：总磷 不确定度评定 分光光度法 重复性试验 

分 类 号：O65[理学—分析化学]