分光光度法测定环境水样中镁的研究  

Study on Determining Mg in Environmental Water Sample by Spectrophotometry

作　　者：李德良[1] 黄庆斌[1] 李明[1] 李海涛[1] 尹家元[2] 胡秋芬[1] 

机构地区：[1]云南省玉溪师范学院化学系,云南玉溪653100 [2]云南大学化学系,云南昆明650091

出　　处：《干旱环境监测》2004年第1期5-6,共2页Arid Environmental Monitoring

摘　　要：研究了4-(2-羟基-4-硝基苯偶氮)-1-苯基-3-甲基吡唑啉酮(HNAPMP)与镁的显色反应,在硼砂—氢氧化钠(pH=10)缓冲介质中,乳化剂-OP存在下,HNAPMP与镁反应生成2∶1稳定络合物,λmax为525nm,ε为3 63×104L·mol-1·cm-1。镁含量在0—0 8mg/L内符合比耳定律,方法用于环境水样中镁的测定,结果令人满意。This paper studys color reaction of HNAPMP with Mg. At the condition of pH=10 buffer solution, HNAPMP can react with cobalt and form a stable 2∶1 complex. After extracted by C_(18) solid-phase extraction colum and then eluted by alcohol, the complex can be detected at λ=525 nm. The molar absorpitivity is 3.63×10~4　L·mol^(-1)·cm^(-1), and the beer's law is obeyed in the Mg rang of 0 — 0.8　mg/L. It is satisfied that apply this method to determine Mg in environmental water sample.

关 键 词：4-(2-羟基-4-硝基苯偶氮)-1-苯基-3-甲基吡唑啉酮 镁 光度法 环境水样 

分 类 号：X830.2[环境科学与工程—环境工程]