Abstract
A new redox-driven type of emulsion liquid membrane separation is described. Milligram amounts of copper(II) in 0.2 M hydrochloric acid were reduced to copper(I) in the presence of ascorbic acid (1 M≡1 mol l−1). The copper solution was emulsified with a (1+4) mixture of toluene and n-heptane using Span-80 (sorbitan monooleate) as an emusifier. The resulting water-in-oil emulsion was dispersed in 0.2 M hydrochloric acid containing hydrogen peroxide and neocuproine (2,9-dimethyl-1,10-phenanthroline) by stirring for 10 min. The copper in the internal aqueous phase was selectively transported to the external one, leaving other heavy metals (e.g., Mn, Co, Ni, Cd and Pb) in the internal aqueous phase. After collecting the dispersed emulsion globules, they were demulsified by heating and the metals in the segregated aqueous phase were determined by graphite-furnace atomic absorption spectrometry (GFAAS). The selective transport of copper offered the multielement separation of trace heavy metals from a copper matrix, allowing the GFAAS determination of impurities at the 0.01% level in copper metal.
References
Nakashio F (1993) J Chem Eng Jpn 26:123–133
Sastre AM, Kumar A, Shukla JP, Singh RK (1998) Sep Purif Methods 27:213–298
Hiraide M, Ishikawa K, Kawaguchi H (1996) Fresenius J Anal Chem 356:155–158
Hiraide M, Hasegawa K (1999) Fresenius J Anal Chem 363:261–264
Matsumiya H, Kageyama T, Hiraide M (2004) Anal Chim Acta 507:205–209
Kageyama T, Matsumiya H, Hiraide M (2004) Anal Bioanal Chem 379:1083–1087
Matsumiya H, Ohkouchi R, Hiraide M (2006) Anal Chim Acta 556:438–443
Gennis RB (1989) Biomembranes: molecular structure and function. Springer, Berlin Heidelberg New York
Marczenko Z (1986) Separation and spectrophotometric determination of elements. Ellis Horwood, Chichester, UK
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Matsumiya, H., Yatsuya, Y. & Hiraide, M. Redox-driven transport of copper ions in an emulsion liquid membrane system. Anal Bioanal Chem 385, 944–947 (2006). https://doi.org/10.1007/s00216-006-0487-1
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00216-006-0487-1