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Latex-coated polymeric monolithic ion-exchange stationary phases. 2. Micro-ion chromatography


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Zakaria, P, Hutchinson, JP, Avdalovic, N, Liu, Y and Haddad, PR 2005 , 'Latex-coated polymeric monolithic ion-exchange stationary phases. 2. Micro-ion chromatography' , Analytical Chemistry, vol. 77, no. 2 , pp. 417-423 , doi: 10.1021/ac048747l.

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Latex-coated monolithic polymeric stationary phases are used for micro-ion chromatography (-IC) of inorganic anions. Monolithic columns were prepared by the in situ polymerization of butyl methacrylate, ethylene dimethacrylate, and 2-acrylamido-2-methyl-1-propanesulfonic acid within fused-silica capillaries of varying internal diameters. Introduction of ion-exchange sites was achieved by coating the anionic polymeric monolith with either Dionex AS10 or Dionex AS18 quaternary ammonium functionalized latex particles to give total ion-exchange capacities in the range 9-24 nequiv for a 30-cm column. The resultant -IC columns were used for the separation of anionic analytes using chloride or acetate as the eluent-competing ion and direct UV spectrophotometric detection at 195 nm or using hydroxide as the eluent-competing ion and suppressed or nonsuppressed contactless conductivity detection. Separation efficiencies of 13 000 plates/m were observed (for iodate), and separation efficiency was maintained for large increases in flow rate (up to 42 L/min, corresponding to a linear flow velocity of 18.5 mm/s), enabling highly reproducible, rapid separations to be achieved (seven analyte anions in less than 2 min). Use of a hollow fiber micromembrane suppressor enabled effective suppression of hydroxide eluents over the range 0.5-5.0 mM, thereby permitting suppressed conductivity detection to be performed. However, the relatively large size of the suppressor resulted in reduced separation efficiencies (e.g., 5400 plates/m for iodate). Detection limits obtained with suppressed conductivity detection were in the range 0.4-1.2 M.

Item Type: Article
Authors/Creators:Zakaria, P and Hutchinson, JP and Avdalovic, N and Liu, Y and Haddad, PR
Journal or Publication Title: Analytical Chemistry
ISSN: 0003-2700
DOI / ID Number: 10.1021/ac048747l
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Copyright © 2005 American Chemical Society

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