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 Pd
2+, Hg
2+, Cu
2+ and Ag
+ were extracted with 0.1% CHCl
3 solution of dithizone at pH 0-1, and then those of Bi
3+, Cd
2+, Co
2+, Ni
2+, Pb
2+ and Zn
2+ at pH 7-8, and lastly, those of Tl
+, Fe
2+, Mn
2+ and Sn
2+ 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 CCl
4-CH
2Cl
2-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% HNO
3, 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 Cu
2+, Ni
2+, Co
2+, 0.3 ppm for Hg
2+, 0.4 ppm for Pd
2+, Ag
+, Cd
2+, 0.8 ppm for Zn
2+, 3.0 ppm for Pd
2+, 5.0 ppm for Bi
3+.
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