曙红共振散射法测定痕量银  

Eosin resonance scattering method for the determination of trace silver

作　　者：翟好英[1] 张学艳[1] 阮尚全[1] 谭学蓉[1] 

机构地区：[1]内江师范学院化学与生命科学系,四川内江641112

出　　处：《冶金分析》2009年第12期17-20,共4页Metallurgical Analysis

基　　金：四川省教育厅科研项目资助(No.2006B101)

摘　　要：在pH4．39的Walpole缓冲溶液中，Ag^＋分别与曙红B（EB）和曙红Y（EY）反应形成络合物微粒，使溶液的共振散射（RS）强度显著增强，其最大散射峰均位于282nm处。在优化的实验条件下，在0．0108～1．30μg／mL范围内，Ag^＋浓度分别与EB和EY体系的共振散射强度（ΔI282nm）之间呈较好的线性关系，检出限分别为74．2ng／L（EB）和86．5ng／L（EY）。该方法应用于废胶片中痕量银的测定，相对标准偏差为1．3％～3．4%，回收率在96．7％～104．3％之间。In Walpole buffer solution at pH 4.39, Ag^＋ reacted with Eosin B and Eosin Y, respectively, forming two kinds of ion-association complexes. The resonance scattering intensity of the solution was obviously strengthened, and their maximum resonance scattering peaks were all at 282 nm. Under the optimum experimental conditions, there was a good linear relationship between the resonance scattering intensity （ΔI282.m） of the EB or EY system and the Ag^＋ concentration in the range of 0. 010 8- 1.30 μg/mL. The detection limits were 74. 2 ng/L （EB） and 86.5 ng/L （EY）. This method has been applied to determine trace silver in waste film with the RSD of 1.3%- 3.4% and the recovery of 96. 7%-104. 3%.

关 键 词：银 曙红B 曙红Y 共振散射 

分 类 号：O657.31[理学—分析化学]