Zn^(2+)-邻菲啰啉-亮黄缔合体系双波长光度法测定锌  

Dual-wavelength spectrophotometric determination of zinc with Zn^(2+)-phen-bright yellow association system

作　　者：李人宇[1,2] 李咏梅[2,3] 卢洋[1] 

机构地区：[1]连云港师范高等专科学校,连云港222006 [2]淮海工学院江苏省海洋资源开发研究院,连云港222005 [3]淮海工学院化学工程学院,连云港222005

出　　处：《分析试验室》2010年第10期81-83,共3页Chinese Journal of Analysis Laboratory

基　　金：连云港市科技项目(SH0816);江苏省海洋资源开发研究院科技开放基金项目(JSIMR09C08)资助

摘　　要：在pH5.7的NaAc-HAc缓冲溶液中,Zn2+与邻菲啰啉(phen)和亮黄(BY)反应生成稳定的离子缔合物[Zn(phen)3]BY,使BY褪色,492 nm处出现正吸收峰,379 nm处出现负吸收峰。选定测量波长为492 nm,参比波长为379 nm,建立了双波长光度法测定微量锌的新方法。表观摩尔吸光系数为3.01×104L.mol-1.cm-1,线性范围为0~1.5μg/mL,检出限为18.5μg/L。方法用于测定锌强化营养盐和健康平衡盐中锌,相对标准偏差为0.69%~0.87%(n=5),回收率为98.4%~99.3%。A new method for the determination of micro zinc by double-wavelength spectrophotometry using 492 nm as the detection wavelength and 379 nm as the reference wavelength was developed.In NaAc-HAc buffer solution at pH 5.7,Zn2+ reacts with phen and bright yellow(BY) to form a stable ion-association complex [Zn(phen)3]BY,which leads to the fading of BY.As a result,there were a positive Absorption peak at 492 nm and a negative Absorption peak at 379 nm.The apparent molar Absorption coefficient was 3.01×104 L·mol...

关 键 词：双波长光度法 锌 邻菲啰啉 亮黄 离子缔合物 

分 类 号：O657.3[理学—分析化学]