活性炭吸附脱色法测定深色革样中的Cr(Ⅵ)含量  

Determination of Cr(Ⅵ) in Deep Color Leather by Means of De-coloring with Act ive Carbon

作　　者：张见立[1] 王全杰[1,2] 汤克勇[1] 

机构地区：[1]郑州大学材料科学与工程学院 [2]国家制革技术研究推广中心山东烟台264000

出　　处：《中国皮革》2006年第3期43-46,51,共5页China Leather

基　　金：国家高技术研究发展计划(863计划)资助项目(编号:2003AA327100)

摘　　要：探讨了用活性炭吸附时,被吸附的六价铬离子的量与混合液pH之间的关系。试验表明:当混合液的pH超过11·0时,活性炭将很少甚至不再吸附六价铬离子。因此,检测深色革样中的六价铬离子浓度时,可以在混合液的pH大于11·0的情况下,采用活性炭对革样萃取液进行多次吸附脱色处理,达到完全去除革样本身颜色的目的,而不会引起六价铬离子含量的变化,这样就可以准确测出革样中六价铬离子的含量。The relationship between the pH of the mixture and the Cr（ Ⅵ ） quantity adsorbed by active carbon is discussed. The results indicate that little or even no Cr（ Ⅵ ） may be adsorbed by active carbon when the pH of the mixture is higher than 11.0. A precise method to detect the Cr（ Ⅵ ） amount in deep color leather sample may＇be found accordingly. Therefore, before the amount of sexivalent chromium ion（Cr（ Ⅵ ） in the mixture is detected, the pH of the mixture should be adjusted to a value that is higher than 11.0. And then, active carbon is used to de-color the solution repeatedly until the dyestuff is adsorbed thoroughly. The amount of sexivalent chromium ion （Cr（ Ⅵ ） ） in the extraction mixture may be detected precisely and without any influence of dyestuff.

关 键 词：活性炭 吸附脱色 PH 六价铬离子 

分 类 号：TS57[轻工技术与工程—皮革化学与工程]