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Comparative measurements of calcium stability constants of some dicarboxylic acids by titrimetry with pH glass and calcium ion-selective electrodes

Lookup NU author(s): Emeritus Professor Arthur Covington

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Abstract

Calcium ion-selective electrodes based on the ionophore ETH1001 have been used to obtain free calcium ion levels, and hence by data fitting, metal-ligand stability constants in the presence of phthalate, maleate, malonate, oxalate, diglyconate, and tartrate under the conditions of a background ionic strength of 0.1 mol dm-3 NaCl and (25 ± 0.5)°C. The dissociation constants for the acids and the stability constants for calcium ion-ligand complexes, for comparison with the calcium ion-selective results, were separately determined with pH electrodes under the same conditions. © 2005 American Chemical Society.

Publication metadata

Author(s): Sari H, Covington AK

Publication type: Article

Publication status: Published

Journal: Journal of Chemical and Engineering Data

Year: 2005

Volume: 50

Issue: 5

Pages: 1620-1623

Print publication date: 01/09/2005

ISSN (print): 0021-9568

ISSN (electronic): 1520-5134

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/je0501181

DOI: 10.1021/je0501181

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