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Journal of Applied Electrochemistry

, Volume 22, Issue 6, pp 581–584 | Cite as

Determination of arsenic(III) in caustic melts

  • R. Dorin
  • E. J. Frazer
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Abstract

Voltammetric and potentiometric methods were evaluated for the determination of As(III) levels in molten sodium hydroxide at 450°C. Because of the crystallization of As(V) salts on the working electrode, voltammetric measurements were limited to less than 3 wt% As(III) in melts containing up to 6 wt% total arsenic and only 2 wt% in melts containing up to 12 wt% total arsenic. Potentiometry has maximum sensitivity when the As(III)/As(V) ratio was near 1: 1 at 12 wt% total arsenic. The applicability of the two methods for control of an As(III) to As(V) oxidation process was evaluated.

Keywords

Oxidation Sodium Physical Chemistry Crystallization Hydroxide 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    R. Dorin, H. J. Gardner and L. J. Rogers,J. Electroanal. Chem. 77 (1977) 385.Google Scholar
  2. [2]
    A. I. Vogel, ‘A Textbook of Quantitative Inorganic Analysis’, 3rd edn., Longmans, London (1964) pp. 355 and 687.Google Scholar

Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • R. Dorin
    • 1
  • E. J. Frazer
    • 1
  1. 1.Division of Mineral ProductsCSIRO Institute of Minerals, Energy and ConstructionPort MelbourneAustralia

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