Spectrophotometric method for the determination of chlorite and chlorate

The concentrations of aqueous chlorite and chlorate in mixtures can be determined by the decolorization of Indigo Carmine at 610 nm in the presence of FeII. The reactions are stoichiometric and therefore a good correlation between the absorbance and the concentration is found. The linear range for measurements of chlorite is 0–0.51 mg l–1 and that of chlorate is 0–0.78 mg l–1. The detection limits for chlorite and chlorate are 0.036 and 0.008 mg l–1, respectively. The presence of chlorine interferes with the determinations.

[1]  K. O'Halloran,et al.  Acid yellow 17 as a spectrophotometric reagent for the determination of low concentrations of residual free chlorine , 1991 .

[2]  P. Singer,et al.  Technical Note: The Formation of Chlorate From the Reaction of Chlorine and Chlorite in Dilute Aqueous Solution , 1987 .

[3]  B. Chiswell,et al.  Method based on Chelex-100 ion-exchange resin for the removal of chlorine interference in the determination of chlorite ion , 1992 .

[4]  J. Hoigne,et al.  Determination of ozone in water by the indigo method , 1981 .

[5]  E. M. Aieta,et al.  Determination of Chlorine Dioxide, Chlorine, Chlorite, and Chlorate in Water , 1984 .

[6]  R. Aston.  Developments in the Chlorine Dioxide Process. , 1950 .

[7]  R. Klein,et al.  Spectrophotometric determination of chlorine dioxide , 1981 .

[8]  P. Singer,et al.  Chlorine Dioxide Effects on THMFP, TOXFP, and the Formation of Inorganic By-products , 1987 .

[9]  K. O'Halloran,et al.  Use of Lissamine Green B as a spectrophotometric reagent for the determination of low residuals of chlorine dioxide , 1991 .

[10]  G. Gordon,et al.  Determination of chlorite at very low levels by using differential pulse polarography , 1988 .

[11]  A. P. Black,et al.  New Methods for the Colorimetric Determination of Halogen Residuals. Part II. Free and Total Chlorine , 1967 .

[12]  P. Shaffer,et al.  Oxidation-Reduction Potentials, Ionization Constants and Semiquinone Formation of Indigo Sulfonates and their Reduction Products , 1959 .

[13]  C. Rupe,et al.  Use of syringaldazine in a photometric method for estimating "free" chlorine in water , 1971 .

[14]  G. Gordon,et al.  Utilisation of kinetic-based flow injection methods for the determination of chlorine and oxychlorine species , 1989 .