Using amino acids for the chromatofocusing of metal ions on silica with bonded tetraethylenepentamine groups.

Amino acid-based eluents are used for the chromatofocusing of metal ions on Tetren-SiO chelating sorbent (silica with bonded tetraethylenepentamine groups) for the first time. The smoothest quasilinear pH gradients form for eluents based on glutamic and aspartic acids. The separation of Mn, Cr, Co, Ni, and Cu is achieved. [ABSTRACT FROM AUTHOR]