镉(Ⅱ)-邻菲啰啉-曙红Y缔合体系光度法测定痕量镉  

Spectrophotometric determination of trace cadmium with cadmium(Ⅱ)-o-phenanthroline-eosin Y complex system

作　　者：李咏梅[1] 王新宇[1] 陈蕾[1] 赵盛平 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005

出　　处：《冶金分析》2011年第9期78-80,共3页Metallurgical Analysis

基　　金：国家自然科学基金项目(21001048);淮海工学院化学工程学院2011年度大学生实验室创新项目

摘　　要：研究了镉(Ⅱ)与邻菲啰啉(phen)和曙红Y(EY)的显色反应条件。试验表明,在pH5.0HAc-NaAc缓冲溶液中,镉(Ⅱ)与phen和EY反应生成稳定的离子缔合物[Cd(phen)3]EY,离子缔合物的最大吸收峰位于568nm。镉(Ⅱ)浓度在0.02～0.8μg/mL范围内符合比尔定律,表观摩尔吸光系数为1.07×105 L.mol-1.cm-1,检出限为11.7μg/L。大部分常见离子不干扰测定,样品中较高浓度的Ag+,Hg2+,Ni 2+等离子干扰严重,测定前用巯基棉分离去除。方法用于测定工业废水中镉,结果与原子吸收光谱法一致,相对标准偏差为1.3%～1.6%(n=5),回收率为98%～103%。The color reaction conditions of cadmium  with o-phenanthroline and eosin Y（EY） was investigated.The results showed that cadmium  could react with o-phenanthroline and EY to form a stable ion complex [Cd（phen）3]EY which had maximum absorption peak at 568 nm in HAc-NaAc buffer solution at pH 5.0.Beer＇s law was obeyed in the concentration range of 0.02-0.8 μg/mL for cadmium.The apparent molar absorptivity was 1.07×105 L·mol-1·cm-1 and the detection limit was 11.69 μg/L.Most common irons did not interfere with the determination.The interference of high-content Ag＋,Hg2＋ and Ni2＋ was serious and they should be separated and removed with sulphydryl cotton before determination.The proposed method has been applied to the determination of cadmium  in industrial wastewater samples,and the results were consistent with those obtained by atomic absorption spectrometry.The relative standard deviations（RSD,n=5） were 1.3%-1.6 %,and the recoveries were 98%-103%.

关 键 词：分光光度法 镉 邻菲啰啉 曙红Y 离子缔合物 

分 类 号：O657.32[理学—分析化学]