Determination of arsenic(III) in caustic melts
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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.
KeywordsOxidation Sodium Physical Chemistry Crystallization Hydroxide
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