水中痕量钙镁总量的流动注射分析——偶氮氯膦Ⅰ分光光度法  

Flow Injection Analysis of the Sum of Trace Level Calcium and Magnesium in Water with CPA I Spectrophotometry

作　　者：李志军[1] 张微[1] 葛继荣[1] 叶崧 马惠昌[1] 

机构地区：[1]中国科学院生态环境研究中心

出　　处：《分析科学学报》1998年第2期142-144,共3页Journal of Analytical Science

摘　　要：在乙醇对钙、镁与偶氮氯膦Ⅰ显色体系的增敏条件下，钙镁配合物等摩尔吸光系数波长为５９０ｎｍ．借此建立了测定水中痕量钙镁总量的流动注射分析方法．该法快速准确，检出限可达０．０７μｍｏｌ／Ｌ的钙．对浓度为１０μｍｏｌ／Ｌ的样品测定１０次的相对标准偏差为０．３％．分析能力为１２０样／ｈ，方法适用于各种软化水的分析．In this paper, a wavelength(590nm) with equal absorption coefficients for calcium and magnesium was discovered using the sensitivity enhancement of alcohol in the reaction system of calcium and magnesium with CPA I. Therefore, a flow injection analysis method was established to determined the sum of trace level calcium and magnesium in water with a detection limit of 0.07μm·L -1 . The R.S.D.(n=10) for a sample of 10μm·L -1 was ±0.3% with a sample throughput of 120 samples per hour. The proposed procedure was applied successfully to the analysis of kinds of soft water.

关 键 词：镁 钙镁总量 软化水 水硬度 硬度 测定 分析 

分 类 号：TU991.21[建筑科学—市政工程]