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Determination of trace uranyl in saline samples using chelation ion chromatography
journal contributionposted on 2023-05-16, 11:16 authored by Brett PaullBrett Paull, Paul HaddadPaul Haddad
A liquid chromatographic method for the determination of trace levels of UO22+ in highly saline samples has been developed. A polystyrene divinylbenzene reversed-phase column was impregnated with methylthymol blue, resulting in a chelating stationary phase. An isocratic method, using a 0.5 M KNO3, 40 mM HNO3 eluent, allowed the direct injection of up to 0.2 ml of a saline sample, with UO22+ eluting away from the sample matrix peak in under six minutes. The development of an eluent step gradient procedure, using a step up from 6 mM HNO3 to 60 mM HNO3, allowed sample injection volumes of up to 2 ml without substantial peak broadening and resulted in a detection limit for UO22+ of less than 1 µg l–1, in samples containing massive excesses of matrix metals. The procedure was applied to the determination of trace UO22+ in a saturated saline Antarctic lake sample. The results obtained compared well with those obtained using ICP-MS.
Publication titleAnalytical Communications
Department/SchoolSchool of Natural Sciences
PublisherRoyal Society of Chemistry
Place of publicationUnited Kingdom
Rights statementCopyright © Royal Society of Chemistry 1998.
Socio-economic ObjectivesExpanding knowledge in the chemical sciences