無機薄層クロマトグラフィーの研究(第11報) : 金属ジチゾネートの薄層クロマトグラフィー(その2)

抄録

A method for the separation and identification of fourteen metal ions with dithizone extraction and thin-layer chromatography was investigated. From a solution containing various metal ions, dithizonates of Pd²⁺, Hg²⁺, Cu²⁺ and Ag⁺ were extracted with 0.1% CHCl₃ solution of dithizone at pH 0-1, and then those of Bi³⁺, Cd²⁺, Co²⁺, Ni²⁺, Pb²⁺ and Zn²⁺ at pH 7-8, and lastly, those of Tl⁺, Fe²⁺, Mn²⁺ and Sn²⁺ at pH 9-10. The dithizonates extracted at pH 0-1 and 7-8 were separated on MN-silica gel S-HR layer by using CCl₄-CH₂Cl₂-benzene (1 : 7 : 4) and each spot of the dithizonates was detected and identified directly by its characteristic coloration. The dithizonates extracted at pH 9-10 were reextracted with 20% HNO₃, and free metal ions thus extracted were separated on the same kind of layer by using acetone-3_N HCl (99 : 1) and detected by appropriate reagents. Each limiting amount for the identification of metal ions by this method was as follows : 0.2 ppm for Cu²⁺, Ni²⁺, Co²⁺, 0.3 ppm for Hg²⁺, 0.4 ppm for Pd²⁺, Ag⁺, Cd²⁺, 0.8 ppm for Zn²⁺, 3.0 ppm for Pd²⁺, 5.0 ppm for Bi³⁺.