直接金驼褪色光度法测定镀铬溶液中Cr(Ⅵ)  

Determination of Cr(Ⅵ) in Chrome Plating Solution by Direct Brown 1 Discoloring Spectrophotometry

作　　者：刘志江[1] 张欣[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110168

出　　处：《电镀与精饰》2009年第4期31-33,共3页Plating & Finishing

摘　　要：在硫酸介质中,90℃的水浴加热条件下,Cr(Ⅵ)能氧化色素直接金驼,使其显著褪色,且褪色程度(ΔA)与ρ[Cr(Ⅵ)]在一定范围内成正比关系,据此,建立了测定Cr(Ⅵ)的新方法。线性范围为0～3 mg/L,表观摩尔吸光系数为19 kL/(mol.cm)。方法用于镀铬溶液中Cr(Ⅵ)的测定,结果满意。The direct brown 1 is oxidized directly and discolored obviously by Cr（Ⅵ） in sulfuric acid medium and heating in water bath at 90℃. A new method to determine Cr（ Ⅵ ） is set up according to that the discoloring extent is keeping proportional to the Cr（ Ⅵ ） mass concentration in a certain range. The linear range is 0 -3 （mg/L）. The apparent molar absorptivity is 19 kL/（ mol · cm）. The method can be used to determine Cr（Ⅵ） concentration in chrome plating solution with satisfactory result.

关 键 词：镀铬溶液 Cr(Ⅵ) 直接金驼 褪色光度法 

分 类 号：TG115.335[金属学及工艺—物理冶金]