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Abstract

The use of a low pressure ion chromatograph based upon short (25 mm × 4.6 mm) surfactant coated monolithic columns and a low cost paired emitter–detector diode (PEDD) based detector, for the determination of alkaline earth metals in aqueous matrices is presented. The system was applied to the separation of magnesium, calcium, strontium and barium in less than 7 min using a 0.15 M KCl mobile phase at pH 3, with post-column reaction detection at 570 nm using o-cresolphthalein complexone. A comparison of the performance of the PEDD detector with a standard laboratory absorbance detector is shown, with limits of detection for magnesium and calcium using the low cost PEDD detector equal to 0.16 and 0.23 mg L−1, respectively. Finally, the developed system was used for the determination of calcium and magnesium in a commercial spring water sample.

Item Type:	Article
Authors/Creators:	Barron, L and Nesterenko, PN and Diamond, D and O'Toole, M and Lau, KT and Paull, B
Keywords:	Low pressure ion chromatography; Alkaline earth metals; Post-column reaction; Paired emitter–detector diode detector
Journal or Publication Title:	Analytica Chimica Acta
ISSN:	0003-2670
DOI / ID Number:	https://doi.org/10.1016/j.aca.2006.05.101
Additional Information:	The definitive version is available at http://www.sciencedirect.com
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