溴金酸-罗丹明B和氯金酸-罗丹明6G超高灵敏显色反应的研究——离心光度法测定金  

Studies on Highly Sensitive Colour Reaction of the Complex in the System of Bromogoldic Acid-Rhodamine B and Chlorogoldic Acid-Rhodamine 6G——Centrifugation-Spectrophotometric Determination of Gold

作　　者：吴绍祖[1] 方文焕[1] 

机构地区：[1]华侨大学化学系,泉州362011

出　　处：《分析化学》1993年第2期148-153,共6页Chinese Journal of Analytical Chemistry

摘　　要：本文研究了一个超高灵敏的测定金的方法,离心光度法。在Au-Br-RB体系中络合物λ_(max)=559nm,表观摩尔吸光系数ε_(559)=3.39×10^(11)L·mol^(-1)·cm^(-1),Au(Ⅲ)浓度(0.20×10^(-5)～2.5×10^(-5)μg/10 ml呈线性关系;Au-Cl-R6G体系络合物λ_(max)=531 nm,表观摩尔吸光系数ε_(531)=2.52×10~8L·mol^(-1)·cm^(-1),Au(Ⅲ)浓度(0.20×10^(-2)～2.4×10μg/10ml。呈线性(Ⅲ)关系。本法已用于某些低品位矿样中金的分析,分析结果与标准值相吻合。探讨了超高灵敏的显色反应机理。A highly sensitive centrifugatipn spectrophotometric method has been developed for the determination of trace gold. The molar absorptivity is 3. 39 × 1011L · mol-1 · cm-1 at 559nm in the bromogoldic acid-rhodamine B system,Beer's law is obeyed in the range of 0. 20X 10-s-2. 5X 10' Vg/l?ml for gold. The molar absorptivitiy is 2. 25×108 L · mol-1 · cm-1 at 531 nm in the chlorogoldic acid-rhodamine 6G system, Beer's law is obeyed in the range of 0. 20× 10-2-2. 4×10·g/10 ml for gold. The method has been applied to the determination of gold in the geological sample. The analytical result obtained for gold in sample is in good a-greement with the standard value. The reaction mechanism has been discussed.

关 键 词：金 分光光度法 罗丹明B 

分 类 号：O614.123[理学—无机化学]