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The kinetic study of oxidation of iodine by hydrogen peroxide

Abstract

Iodine chemistry is one of the most important subjects of research in the field of reactor safety because this element can form volatile species which represent a biological hazard for environment. As the iodine and the peroxide are both present in the sump of the containment in the event of a severe accident on a light water nuclear reactor, it can be important to improve the knowledge on the reaction of oxidation of iodine by hydrogen peroxide. The kinetics of iodine by hydrogen peroxide has been studied in acid solution using two different analytical methods. The first is a UV/Vis spectrophotometer which records the transmitted intensity at 460 nm as a function of time to follow the decrease of iodine concentration, the second is an amperometric method which permits to record the increase of iodine+1 with time thanks to the current of reduction of iodine+1 to molecular iodine. The iodine was generated by Dushman reaction and the series of investigations were made at 40{sup o}C in a continuous stirring tank reactor. The influence of the initial concentrations of iodine, iodate, hydrogen peroxide, H{sup +} ions has been determined. The kinetics curves comprise two distinct chemical phases both for molecular iodine  More>>
Authors:
Cantrel, L; [1]  Chopin, J [2] 
  1. Institut de Protection et de Surete Nucleaire, IPNS, CEN Cadarache, Saint Paul lez Durance (France)
  2. Laboratoire d`Electrochimie Inorganique, ENSSPICAM, Marseille (France)
Publication Date:
Dec 01, 1996
Product Type:
Technical Report
Report Number:
PSI-97-02; CONF-9606320-; NEA/CSNI/R(96)-6.
Reference Number:
SCA: 400201; PA: AIX-28:035727; EDB-97:080724; SN: 97001795072
Resource Relation:
Conference: 4. CSNI workshop on the chemistry of iodine in reactor safety, Wuerenlingen (Switzerland), 10-12 Jun 1996; Other Information: PBD: Dec 1996; Related Information: Is Part Of Proceedings of the 4. CSNI workshop on the chemistry of iodine in reactor safety; Guentay, S. [ed.] [Paul Scherrer Inst. (PSI), Villigen (Switzerland)]; PB: 716 p.
Subject:
40 CHEMISTRY; IODINE; OXIDATION; CHEMICAL REACTION KINETICS; ELECTROCHEMISTRY; EXPERIMENTAL DATA; HYDROGEN PEROXIDE; IODATES; PH VALUE; SPECTROPHOTOMETRY
OSTI ID:
481417
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE97624048; TRN: CH9700206035727
Availability:
INIS; OSTI as DE97624048
Submitting Site:
CHN
Size:
pp. 187-211
Announcement Date:

Citation Formats

Cantrel, L, and Chopin, J. The kinetic study of oxidation of iodine by hydrogen peroxide. Switzerland: N. p., 1996. Web.
Cantrel, L, & Chopin, J. The kinetic study of oxidation of iodine by hydrogen peroxide. Switzerland.
Cantrel, L, and Chopin, J. 1996. "The kinetic study of oxidation of iodine by hydrogen peroxide." Switzerland.
@misc{etde_481417,
title = {The kinetic study of oxidation of iodine by hydrogen peroxide}
author = {Cantrel, L, and Chopin, J}
abstractNote = {Iodine chemistry is one of the most important subjects of research in the field of reactor safety because this element can form volatile species which represent a biological hazard for environment. As the iodine and the peroxide are both present in the sump of the containment in the event of a severe accident on a light water nuclear reactor, it can be important to improve the knowledge on the reaction of oxidation of iodine by hydrogen peroxide. The kinetics of iodine by hydrogen peroxide has been studied in acid solution using two different analytical methods. The first is a UV/Vis spectrophotometer which records the transmitted intensity at 460 nm as a function of time to follow the decrease of iodine concentration, the second is an amperometric method which permits to record the increase of iodine+1 with time thanks to the current of reduction of iodine+1 to molecular iodine. The iodine was generated by Dushman reaction and the series of investigations were made at 40{sup o}C in a continuous stirring tank reactor. The influence of the initial concentrations of iodine, iodate, hydrogen peroxide, H{sup +} ions has been determined. The kinetics curves comprise two distinct chemical phases both for molecular iodine and for iodine+1. The relative importance of the two processes is connected to the initial concentrations of [I{sub 2}], [IO{sub 3}{sup -}], [H{sub 2}O{sub 2}] and [H{sup +}]. A rate law has been determined for the two steps for molecular iodine. (author) figs., tabs., 22 refs.}
place = {Switzerland}
year = {1996}
month = {Dec}
}