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Ion-Chromatography Performance of Poly(Aspartic) Acid Bonded Silica with Various Pore Sizes at Different Ionic Strengths and Column Temperatures

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Abstract.

A significant effect of pore size on selectivity was observed for anion exchange on polyaspartic acid-coated silica (PolyCAT A). The retention order of halogenide anions, Cl− <Br− <I−, was completely reversed between 30 nm and 6 nm pore materials. The zwitterionic nature of PolyCAT A made possible the simultaneous separation of anions and cations. With the column temperature, retention of cations is increased whereas retention of anions is decreased. The ionic composition of the eluent had a dramatic effect on separation efficiency with PolyCAT A of 30 nm pores. The separation efficiency of ions was optimal in sulfuric acid-based eluents of reasonably high ionic strength.

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Authors and Affiliations

  1. Division of Analytical Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 119 992, Moscow, Russian Federation

    Pavel A. Kebets, Ekaterina P. Nesterenko & Pavel N. Nesterenko

  2. PolyLC Inc., 9151 Rumsey Road Suite 180, 21045, Columbia, MD, USA

    Andrew J. Alpert

Authors
  1. Pavel A. Kebets
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  2. Ekaterina P. Nesterenko
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  3. Pavel N. Nesterenko
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  4. Andrew J. Alpert
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Correspondence to Pavel N. Nesterenko.

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Kebets, P., Nesterenko, E., Nesterenko, P. et al. Ion-Chromatography Performance of Poly(Aspartic) Acid Bonded Silica with Various Pore Sizes at Different Ionic Strengths and Column Temperatures. Microchim. Acta 146, 103–110 (2004). https://doi.org/10.1007/s00604-004-0201-y

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  • DOI: https://doi.org/10.1007/s00604-004-0201-y

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