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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。
This article examines an ultra-sensitive method of determining gold by centrifugal photometry. In the Au-Br-RB system, the complex λ max = 559 nm, the apparent molar absorptivity ε 559 = 3.39 × 10 11 L · mol -1 cm -1, , The concentration of Au (Ⅲ) was 0.20 × 10 -5 ~ 2.5 × 10 -5 μg / 10 ml, the λ max of the Au-Cl-R6G complex was 531 nm, The molar extinction coefficients ε_ (531) = 2.52 × 10 ~ 8L · mol ~ (-1) · cm ~ (-1) and the concentration of Au (Ⅲ) were 0.20 × 10 ~ (-2) ~ 2.4 × 10μg / 10ml. (Ⅲ) .The method has been applied to the analysis of gold in some low-grade ore samples, the results of which are consistent with the standard values, and the ultra-sensitive color reaction mechanism is discussed.