纸色谱—硫代米蚩酮目视比色法测定岩矿中微量金

Colorimetric Determination of Micro Amount of Gold in Ores with TMK by Using Paper-chromatography

岩矿中微量金的测定,一般采用炭粉吸附、萃取、离子交换等方法分离后,用原子吸收光度法或孔雀绿、硫代米蚩酮萃取分光光度法测定。硫代米蚩酮—异戍醇(或正丁醇)萃取比色法灵敏度较高,但稳定性差,手续烦琐,不易掌握。我们试验用纸色谱分离直接在色谱纸上用硫代米蚩酮显色目视比色测定,手续简单、灵敏度高、稳定性好,可测定0.00x—0.x克/吨金。

A new simple paper-chromatography for the colorimetric determination of micro amount of gold with.thio-Michlers ketone(TMK)in ores has been studied.The sample solution in hydrochloric acid medium was introduced on chro-matographic paper.The developing medium was alcohol-acetic acid-water solution and ascending process was applied.The chromatogram was developed with 0.3%TMK of ethyl alcohol solution.The Rf value of gold was found to be 0.99,the other elements such as Cu,Ni,Co,Se,As,Ag,Mo and Te were less than 0.82.The method could be applied to the determination of 0.00x-0.x g/T gold in ores.