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Chlorite Ion Interference in the Spectrophotometric Measurement of Chlorine Dioxide
Author(s) -
KÖrtvÉlyesi Zsolt,
Gordon Gilbert
Publication year - 2004
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.2004.tb10705.x
Subject(s) - molar absorptivity , chlorite , chlorine dioxide , chemistry , ion , chlorine , analytical chemistry (journal) , molar , inorganic chemistry , chromatography , materials science , optics , organic chemistry , physics , quartz , medicine , dentistry , composite material
The presence of the Cl 2 O 4 − complex, which forms in chlorine dioxide (ClO 2 ) solutions in the presence of chlorite ion, can result in significant error in the spectrophotometric measurement of ClO 2 . In this article, the significance of the Cl 2 O 4 − complex is demonstrated and the formation constant ( K eq ) and the molar absorptivity of this complex are reported. Based on the K eq and the molar absorptivity values, two methods are proposed to correct for the presence of the complex. By using the equation suggested in this article, the error of the determined ClO 2 concentrations is reduced to the level of errors associated with the spectrophotometric measurements.