title: Ion exchange properties of monolithic and particle type iminodiacetic acid modified silica.
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.
authors.affiliation: National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland.
authors.forename: Edel
authors.initials: E
authors.lastname: Sugrue
authors.forename: Pavel
authors.initials: P
authors.lastname: Nesterenko
authors.forename: Brett
authors.initials: B
authors.lastname: Paull
mesh_terms: D002852:Chromatography, Ion Exchange / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007098:Imino Acids / Q000737:chemistry*; D007477:Ions; D008670:Metals / Q000737:chemistry; D008673:Metals, Alkaline Earth; D012822:Silicon Dioxide / Q000737:chemistry*; D013997:Time Factors
chemical_list: D007098:Imino Acids; D007477:Ions; D008670:Metals; D008673:Metals, Alkaline Earth; D012822:Silicon Dioxide; C008109:iminodiacetic acid