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Continuous flow analysis of iron in zinc electrowinning electrolyte using an iron chalcogenide glass ion-selective electrode Part I. Synthetic media
Journal article   Peer reviewed

Continuous flow analysis of iron in zinc electrowinning electrolyte using an iron chalcogenide glass ion-selective electrode Part I. Synthetic media

Roland De Marco, B Pejcic, M Loan and M Wilcox
Talanta, Vol.57(1), pp.115-121
2002
DOI: https://doi.org/10.1016/S0039-9140(02)00003-6
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https://doi.org/10.1016/S0039-9140(02)00003-6View
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Abstract

continuous flow analysis zinc electrowinning electrolyte iron chalcogenide glass ion-selective electrode
It is shown that the iron(III) chalcogenide glass membrane ion-selective electrode (ISE) can be calibrated in continuous flow analysis (CFA) using acidified iron(III) nitrate standards, yielding a 60±3 mV per decade change in activity of Fe3+ response in the range 10-7-10-2 M total iron(III). Extended ageing of the iron(III) ISE in 2 M zinc(II) sulphate did not alter the potentiometric response characteristics of the electrode. Furthermore, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy in the presence and absence of zinc(II) sulphate failed to detect a zinc(II) interference on the iron(III) ISE. CFA/ISE determined activities of Fe3+ in synthetic zinc electrolyte containing 2 × 10-3-2 × 10-1 M total iron(III) yielded results falling within±0.2 log a Fe3+ unit of the corresponding iron speciation data calculated using the MINTEQA2 program. © 2002 Elsevier Science B.V. All rights reserved.

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