5-(4-氨基)苄叉若丹宁光度法测定银  

Spectrophotometric Determination of Silver with 5-(4-Aminobenzylidene)rhodanine

作　　者：汤峨[1] 黄章杰[1] 段德良[1] 尹家元[1] 

机构地区：[1]云南大学化学系,昆明650091

出　　处：《冶金分析》2000年第5期19-21,共3页Metallurgical Analysis

基　　金：云南省教委基金!项目 (991 1 1 39)

摘　　要：研究了新试剂 5 (4 氨基 )苄叉若丹宁 (ABR)与银的显色反应。在 pH7 0NH4Ac缓冲介质中 ,Tween 80存在下 ,ABR与Ag+生成 2∶1桔红色稳定络合物 ,λmax=495nm ,ε =6 0 54× 1 0 4 ,银含量在 0～30 μg/2 5mL范围内符合比尔定律。方法用于显影液和工业废水中微量银的测定 ,结果令人满意。The color reaction of 5 (4 aminobenzylidene)rhodanine(ABR)with silver? was studied. In the presence of Tween 80, the silver? with ABR forms an orange red stable complex of molar ratio 1∶2 at pH7(ammonium acetate buffer soln.). The apparent molar absorptivity is 6.054×10 4 at the maximum absorption wavelength of complex(495nm). Beer's law is obeyed in the range of 0 30μg/25mL for silver?. The method has been applied to the determination of silver in developing agent and the industrial waste water with satisfactory results.

关 键 词：银 光度法 测定 ABR 显色剂 

分 类 号：O657.32[理学—分析化学]