铜(Ⅱ)-硫氰酸盐-乙基紫-微乳液分光光度法测定钢样中的微量铜  

Determination of trace copper in steel samples with copper-thiocyanate-ethyl violet-microemulsion spectrophotometry

作　　者：董文丽[1] 徐刚[1] 刘火安[1] 

机构地区：[1]重庆科技学院化学化工学院,重庆401331

出　　处：《分析试验室》2012年第3期33-35,共3页Chinese Journal of Analysis Laboratory

基　　金：国家国际科技合作专项(2009DFA91450)资助

摘　　要：在非离子型微乳液(OP/n-C5H11OH/n-C7H16/H2O)存在下,Cu2+与硫氰酸盐形成络阴离子[Cu(SCN)4]2-,在pH 3.6乙酸盐缓冲溶液中,该络阴离子再与乙基紫(EV)形成吸附型离子络合物,该络合物的组成为[Cu(SCN)4]2-:EV=1:2,最大吸收波长为660nm,表观摩尔吸光系数ε660为1.08×l05L.mol-1.cm-1,Cu2+含量在1.7～18.0μg/50 mL范围内符合比尔定律,检出限为0.5μg/50 mL,用该方法测定了钢中的铜,相对标准偏差小于2%。Copper and thiocyanate can form a complex anion [Cu（SCN）4]^2-.Then ethyl violet forms an adsorption ion-association complex with [Cu（SCN）4]2-in pH 3.6 acetate buffer solution by using the nonionic（O/w） microemulsion（OP/n-C5H11OH/n-C7H16/H2O）.The composition ratio of [Cu（SCN）4]2-to ethyl violet is 1：2.The maximum absorption wavelength of the ion-association complex is 660 nm.The apparent molar absorption coefficient is 1.08×10^5 L·mol^-1·cm^-1.Beer′s law is obeyed in the concentration rang of 1.7-18.0 μg/50 mL for copper.The detection limit is 0.5 μg/50 mL.The method is applied to the determination of copper in the steel samples,the relative standard deviation is less than 2%,and the results are satisfactory.

关 键 词：铜 乙基紫 微乳液分光光度法 钢样 

分 类 号：O657.3[理学—分析化学]