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Kinetics and mechanism of the hydrolytic disproportionation of iodine
Author(s) -
SebőkNagy Krisztina,
Körtvélyesi Tamás
Publication year - 2004
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20033
Subject(s) - disproportionation , chemistry , iodide , ionic strength , kinetics , iodine , hydrolysis , reaction mechanism , ionic bonding , spectrophotometry , analytical chemistry (journal) , inorganic chemistry , organic chemistry , chromatography , catalysis , aqueous solution , ion , physics , quantum mechanics
Kinetics of the hydrolytic disproportionation of I 2was studied by UV–VIS spectrophotometry at 298 K and at the ionic strength 0.2 M (NaClO 4 ) in buffered solutions in the pH range 8.91–10.50 at different initial iodide concentrations. The characterization of this reaction is fundamental for modeling oscillatory and front reactions in the presence of iodine as reactant or intermediate as well as for drinking water treatment. A matrix rank analysis confirmed three absorbing species in the beginning of the reaction, whereas later assumption of two species is enough to describe the experimental data in the visible part of the spectrum. A reaction mechanism was proposed for disproportionation by using fitting/simulation with a multipurpose program package ZiTa, by simultaneous evaluation of 17,906 points in 79 experimental curves. A parameter set was suggested, which was obtained by absolute, relative, and orthogonal fittings of the experimental data. © 2004 Wiley Periodicals, Inc. Int J Chem Kinet 36: 596–602, 2004