Separation of transition metals in nonaqueous media with capillary electrophoresis.
The separation of transition metal Ni2+, Cu2+, Co2+, Zn2+, Cd2+ and Fe3+ in methanol was investigated by using different types of organic acids as complexing agents. In pure methanol, the weaker and simpler acetic, propionic, butyric and valeric acids could enhance metal ions selectivity by increasing acid concentration and metal ions could be separated with high efficiency. However, hydroxycarboxylic acids obviously made separation efficiency worse. The effect of mixed organic acids, mixture solvent (methanol-acetonitrile, methanol-water) on metal ions separation was discussed further. The advantages of using nonaqueous solvent over aqueous for metal ions separation were shown finally.
Qu
Feng
F
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Lin
Jin-Ming
JM
D019075:Electrophoresis, Capillary / Q000379:methods*; D008670:Metals / Q000302:isolation & purification*; D012997:Solvents / Q000737:chemistry
D008670:Metals; D012997:Solvents