Iodide sources in the aquatic environment ...
Document type :
Article dans une revue scientifique: Article de synthèse/Review paper
PMID :
Permalink :
Title :
Iodide sources in the aquatic environment and its fate during oxidative water treatment - A critical review.
Author(s) :
Mackeown, Henry [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Von Gunten, Urs [Auteur]
Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf] [EAWAG]
Criquet, Justine [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Von Gunten, Urs [Auteur]
Swiss Federal Insitute of Aquatic Science and Technology [Dübendorf] [EAWAG]
Criquet, Justine [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Journal title :
Water Research
Abbreviated title :
Water Res
Volume number :
217
Pages :
118417
Publication date :
2022-05-01
ISSN :
1879-2448
English keyword(s) :
I-THM
Chloramination
Chlorination
Disinfection by-products
Iodine
Oxidation
Drinking water
Chloramination
Chlorination
Disinfection by-products
Iodine
Oxidation
Drinking water
HAL domain(s) :
Chimie/Chimie analytique
English abstract : [en]
Iodine is a naturally-occurring halogen in natural waters generally present in concentrations between 0.5 and 100 µg L−1. During oxidative drinking water treatment, iodine-containing disinfection by-products (I-DBPs) can ...
Show more >Iodine is a naturally-occurring halogen in natural waters generally present in concentrations between 0.5 and 100 µg L−1. During oxidative drinking water treatment, iodine-containing disinfection by-products (I-DBPs) can be formed. The formation of I-DBPs was mostly associated to taste and odor issues in the produced tap water but has become a potential health problem more recently due to the generally more toxic character of I-DBPs compared to their chlorinated and brominated analogues. This paper is a systematic and critical review on the reactivity of iodide and on the most common intermediate reactive iodine species HOI. The first step of oxidation of I− to HOI is rapid for most oxidants (apparent second-order rate constant, kapp > 103 M−1s−1 at pH 7). The reactivity of hypoiodous acid with inorganic and organic compounds appears to be intermediate between chlorine and bromine. The life times of HOI during oxidative treatment determines the extent of the formation of I-DBPs. Based on this assessment, chloramine, chlorine dioxide and permanganate are of the highest concern when treating iodide-containing waters. The conditions for the formation of iodo-organic compounds are also critically reviewed. From an evaluation of I-DBPs in more than 650 drinking waters, it can be concluded that one third show low levels of I-THMs (<1 µg L−1), and 18% exhibit concentrations > 10 µg L−1. The most frequently detected I-THM is CHCl2I followed by CHBrClI. More polar I-DBPs, iodoacetic acid in particular, have been reviewed as well. Finally, the transformation of iodide to iodate, a safe iodine-derived end-product, has been proposed to mitigate the formation of I-DBPs in drinking water processes. For this purpose a pre-oxidation step with either ozone or ferrate(VI) to completely oxidize iodide to iodate is an efficient process. Activated carbon has also been shown to be efficient in reducing I-DBPs during drinking water oxidation.Show less >
Show more >Iodine is a naturally-occurring halogen in natural waters generally present in concentrations between 0.5 and 100 µg L−1. During oxidative drinking water treatment, iodine-containing disinfection by-products (I-DBPs) can be formed. The formation of I-DBPs was mostly associated to taste and odor issues in the produced tap water but has become a potential health problem more recently due to the generally more toxic character of I-DBPs compared to their chlorinated and brominated analogues. This paper is a systematic and critical review on the reactivity of iodide and on the most common intermediate reactive iodine species HOI. The first step of oxidation of I− to HOI is rapid for most oxidants (apparent second-order rate constant, kapp > 103 M−1s−1 at pH 7). The reactivity of hypoiodous acid with inorganic and organic compounds appears to be intermediate between chlorine and bromine. The life times of HOI during oxidative treatment determines the extent of the formation of I-DBPs. Based on this assessment, chloramine, chlorine dioxide and permanganate are of the highest concern when treating iodide-containing waters. The conditions for the formation of iodo-organic compounds are also critically reviewed. From an evaluation of I-DBPs in more than 650 drinking waters, it can be concluded that one third show low levels of I-THMs (<1 µg L−1), and 18% exhibit concentrations > 10 µg L−1. The most frequently detected I-THM is CHCl2I followed by CHBrClI. More polar I-DBPs, iodoacetic acid in particular, have been reviewed as well. Finally, the transformation of iodide to iodate, a safe iodine-derived end-product, has been proposed to mitigate the formation of I-DBPs in drinking water processes. For this purpose a pre-oxidation step with either ozone or ferrate(VI) to completely oxidize iodide to iodate is an efficient process. Activated carbon has also been shown to be efficient in reducing I-DBPs during drinking water oxidation.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Collections :
Submission date :
2024-02-28T22:29:03Z
2024-03-19T13:23:24Z
2024-03-19T13:23:24Z
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