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Abstract

A 10 cm silica monolith has been modified with iminodiacetic acid (IDA) groups and characterised for its selectivity toward alkali, alkaline earth, and selected transition metal cations. Physical characterisation of the modified monolith found non-homogeneous modification along the length of the monolith, although sufficient capacity was achieved to facilitate significant retention of alkaline earth and transition/heavy metal ions over a range of eluent pH and ionic strength conditions. For alkaline earth and transition/heavy metal ions, selectivity of the 10 cm IDA monolith closely matched that seen with a 25 cm IDA modified silica gel particle packed column, although the separation of alkali metal ions was noticeably poorer on the monolithic column. Peak efficiencies for most metal ions were of a similar order for both column types, except for Zn(II), which showed significant peak broadening on the IDA monolithic column.

Item Type:	Article
Authors/Creators:	Sugrue, E and Nesterenko, PN and Paull, B
Keywords:	Monolithic silica • Iminodiacetic acid • Cations • Ion exchange chromatography
Journal or Publication Title:	Journal of Separation Science
ISSN:	1615-9306
DOI / ID Number:	10.1002/jssc.200401794
Additional Information:	The definitive published version is available online at: http://interscience.wiley.com
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