File(s) under permanent embargo
Towards high capacity latex-coated porous polymer monoliths as ion-exchange stationary phases
journal contribution
posted on 2006-04-01, 00:00 authored by J P Hutchinson, E F Hilder, Robert ShellieRobert Shellie, J A Smith, P R HaddadThe preparation of high capacity agglomerated monolithic ion-exchangers for capillary ion chromatography is described. Post-modification of reactive monoliths was investigated as an alternative to co-polymerisation of a suitable functional monomer with an overarching goal of increasing ion-exchange capacity. Direct sulfonation of poly styrene-co-divinyl benzene monoliths using concentrated sulfuric acid or chlorosulfonic acid was unsuccessful even for monoliths containing as low as 8% crosslinker. In contrast, chemical transformation of reactive monoliths containing glycidyl methacrylate was used to increase the ion-exchange capacity by up to more than thirty-fold with ion exchange capacities of 14-29 μequiv g-1 achieved. Three different reactions were considered, including reaction with 4-hydroxybenenesulfonic acid under basic conditions; reaction with thiobenzoic acid followed by transformation to a reactive thiol and the subsequent oxidation to the sulfonic acid; and direct sulfonation with sodium sulfite. Of these, the reaction with sodium sulfite resulted in the most significant increase in the capacity and the best separation performance. In the isocratic mode separation efficiencies of over 13 500 plates m-1 were observed (for iodate). The separation of seven inorganic anions was also demonstrated using a hydroxide gradient. © The Royal Society of Chemistry 2006.
History
Journal
AnalystVolume
131Issue
2Pagination
215 - 221Publisher
Royal Society of ChemistryLocation
Cambridge, Eng.Publisher DOI
ISSN
0003-2654Language
engPublication classification
C1.1 Refereed article in a scholarly journalUsage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC