甲苯浮选金属离子-碘离子-甲基蓝缔合物光度法测定高盐溶液中痕量铜银镉锌  

Spectrophotometric determination of trace Cu,Ag,Pb,Cd in high salt samples with toluene flotation of metal ions-iodine anion-methylene blue association complex

作　　者：李春香[1] 徐婉珍[1] 李松田[1] 闫永胜[1] 

机构地区：[1]江苏大学化学化工学院,江苏镇江212013

出　　处：《冶金分析》2007年第3期75-77,共3页Metallurgical Analysis

基　　金：科技部创新基金项目(03C26213200932);江苏大学高级人才基金(04JDG017)

摘　　要：在酸性条件下,利用金属离子、碘离子和亚甲蓝形成一种三元缔合物[MIn+1]-[MB]+,该缔合物极易溶于甲苯,通过N2能浮选于甲苯中,分光光度法测定,据此建立了复杂基质样品中痕量重金属银、铜、镉、铅的检测新方法。考查了溶液pH值、KI和亚甲蓝溶液用量以及有机溶剂等对浮选的影响,讨论了共存离子的干扰情况。Cu,Pb,Cd和Ag的检出限分别为0·9,0·8,0·5和0·4ng/mL。本法用于高浓度盐溶液和工业硫酸样品中痕量Cu,Cd,Pb,Ag的分析,实测样品的回收率为80%～93%,相对标准偏差小于5%。A ternary association complex [MIn＋1]^-[MB]^＋, which were formed by metals ions（Mn^2＋）, iodine anion（I^-）and methylene blue （C16H18 C1N3S·3H2O, MB）, was applied in the preconcentration of trace heavy metals （i. e. Ag,Cu,Cd,Pb） in complex matrix samples,such as high salt solution and commercial sulfuric acid by gas flotation. The ternary association complex was floated and absorbed into 5 mL of toluene,and the toluene phase was directly determined by the spectrophotometry. Several parameters, including flotation pH, volume of KI and methylene blue solution, and selection of organic solvent were studied. The detection limits were 0. 9,0. 8,0. 5 and 0.4 ng/mL for Cu,Pb,Cd and Ag, respectively. The interference of coexistent elements in the determination were also studied. The developed method was applied in the determination of trace Cu,Pb,Cd and Ag in artificial seawater and commercial sulfuric acid samples with the average recoveries for determined metals of 80M-93M, RSD of less than 5 %.

关 键 词：溶剂浮选 分光光度法 痕量重金属 复杂样品 

分 类 号：O657.3[理学—分析化学]