Direct and Sequential Potentiometric Determination of Hypochlorite, Chlorite, and Chlorate Ions When Hypochlorite Ion is Present in Large Excess

摘要: A selective potentiometric technique has been developed for the determination of OCl - at high concentration (e.g., 1-3 M) and ClO 2 3 comparatively low concentrations 50- 150 mg/L) when these species are present together in solution. The method uses sulfite ion as a mask to selectively quantitatively remove pH 10.5. Thus, is measured masked same time. At 10.5, SO 2- does not react with or . remaining removed triiodide ion. Following masking procedure, sequential carried out either by iodometric titration appropriate chromatography. results from direct using compared those an indirect reference