Version 2 2023-06-23, 11:07Version 2 2023-06-23, 11:07
Version 1 2023-05-26, 16:02Version 1 2023-05-26, 16:02
journal contribution
posted on 2023-06-23, 11:07authored byP Zakaria, J Hutchinson, N Avdalovic, Y Liu, Paul HaddadPaul Haddad
Latex-coated monolithic polymeric stationary phases are used for micro-ion chromatography (μ-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 μ-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 μL/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 μM.
History
Publication title
Analytical Chemistry
Volume
77
Issue
2
Article number
2
Number
2
Pagination
417-423
ISSN
0003-2700
Department/School
Chemistry
Publisher
Americal Chemical Society
Publication status
Published
Rights statement
Copyright Copyright 2005 American Chemical Society
Repository Status
Restricted
Socio-economic Objectives
280105 Expanding knowledge in the chemical sciences