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Determination of trace magnesium and strontium in calcium carbonate and calcareous skeletons of marine planktonic organisms using high performance chelation ion chromatography

Citation

Li, Y and Paull, B and Muller, MN and Nesterenko, PN, Determination of trace magnesium and strontium in calcium carbonate and calcareous skeletons of marine planktonic organisms using high performance chelation ion chromatography, Analytical Methods, 7, (2) pp. 416-422. ISSN 1759-9660 (2015) [Refereed Article]

Copyright Statement

2015 The Royal Society of Chemistry

DOI: doi:10.1039/c4ay02126f

Abstract

A new high performance chelation ion chromatography method for the simultaneous determination of trace magnesium and strontium in various calcium carbonate samples was developed. Separations were performed on a monolithic silica column (Chromolith Si, 100 4.6 mm I.D.) chemically modified with hydroxyethyliminodiacetic acid functional groups. At a flow rate of 1.0 mL min−1, an eluent containing 80 mM NaCl and 20 mM picolinic acid at pH 5.30 was found to provide complete separation of Ni2+, Cu2+, Mg2+, Cd2+, Sr2+ and Ca2+ in 15 minutes, in matrices with 20 000 fold excess of Ca2+. Two post-column reagents, o-cresolphthalein complexone (o-CPC) and ZnEDTA-PAR, were compared for post-column reaction based photometric detection at 570 and 490 nm, respectively. This method provides sensitive detection of Mg2+ (LOD 20 μg L−1 and 5 μg L−1 for o-CPC and ZnEDTA-PAR, respectively) and Sr2+ (LOD 200 μg L−1 and 39 μg L−1 for o-CPC and ZnEDTA-PAR, respectively). Using o-CPC, the linear range was from 0.5 to 24 mg L−1 for Mg2+ and from 1.0 to 32 mg L−1 for Sr2+. For ZnEDTA-PAR, the linear range was from 0.5 to 4 mg L−1 for Mg2+ and 0.1 to 32 mg L−1 for Sr2+. The method was applied to the analysis of a variety of calcium carbonate samples, including laboratory reagents, limestone NIST certified reference material, and the calcite based shells of marine microorganisms. The accuracy of the method was confirmed using inductively coupled plasma mass spectrometry.

Item Details

Item Type:Refereed Article
Keywords:chelation ion chromatography, coccolithophore calcite, marine plankton, magnesium, strontium, determination
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
UTAS Author:Li, Y (Mr Yan Li)
UTAS Author:Paull, B (Professor Brett Paull)
UTAS Author:Muller, MN (Dr Marius Muller)
UTAS Author:Nesterenko, PN (Professor Pavel Nesterenko)
ID Code:100219
Year Published:2015
Funding Support:Australian Research Council (DP130101518)
Web of Science® Times Cited:1
Deposited By:Chemistry
Deposited On:2015-05-07
Last Modified:2017-10-28
Downloads:0

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