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Transition metal availability to speleothems controlled by organic binding ligands

A. Hartland1,

1Environmental Research Institute, School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand

R. Zitoun2

2Department of Chemistry and Centre for Trace Element Analysis, University of Otago, PO Box 56, Union Place, Dunedin, New Zealand

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Hartland, A., Zitoun, R. (2018) Transition metal availability to speleothems controlled by organic binding ligands. Geochem. Persp. Let. 8, 22–25.

Marsden Fund (UOW1403) and Rutherford Discovery Fellowship (RDF-UOW1601).

Geochemical Perspectives Letters v8  |  doi: 10.7185/geochemlet.1824
Received 18 July 2018  |  Accepted 3 September 2018  |  Published 27 September 2018
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 (a) Box plots of conditional stability constants (logKCuL) of CuL complexes in cave samples. Values calculated using ProMCC (Omanović et al., 2015

Omanović, D., Garnier, C., Pižetaa, I. (2015) ProMCC software. https://sites.google.com/site/mccprosece/download.

). Error bars are 1 standard deviation. (b) Correlation between the total Cu concentration ([CuT]) and corresponding Cu ligand concentration. For all samples which plot above the 1:1 dashed diagonal line, one can assume that all available Cu is strongly complexed to organic ligands. Vertical error bars represent the fitting error in [L1]. WP = Waipuna Cave (n = 24), F = filtered, UF = unfiltered; HC = Hodges Creek Cave (n = 6); NB = Nettlebed Cave (n = 2); LXM = Mt Luxmore Caves; Daves Cave (n = 3) and Calcite Cave (n = 2).
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Figure 2 Available (Cu’), inorganic (CuXIN) and free (Cu2+) copper concentrations plotted against [CuT] in cave samples calculated using ProMCC (Omanović et al., 2015

Omanović, D., Garnier, C., Pižetaa, I. (2015) ProMCC software. https://sites.google.com/site/mccprosece/download.

). [Cu’] are consistently low despite widely varying [CuT] demonstrating the dominant influence of organic ligands in these samples.
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Figure 3 Conceptual diagram illustrating the influence of Cu ligands on the incorporation of Cu in speleothems.
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