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


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.


Oxidation Sodium Physical Chemistry Crystallization Hydroxide 
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  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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