Abstract
The prevention of oxidation of sodium sulfite solution was investigated. As an antioxidant of sodium sulfite solution, Span 80 (a nonionic surfactant of the type of sorbitan fatty acids ester) was extremely effective. In the case of sulfite solution containing such metal ions as Fe2+, Ni2+, and VO43-, it was necessary to use a masking agent or a precipitant of metal ions in addition tothe above-mentioned antioxidant, and sodium tripolyphosphate and Allon 10 H wereespecially useful for a masking agent and a precipitant respectively.
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