Titre :

Iodide sources in the aquatic environment and its fate during oxidative water treatment - A critical review.

Auteur(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

Titre de la revue :

Water Research

Nom court de la revue :

Water Res

Numéro :

217

Pagination :

118417

Date de publication :

2022-05-01

ISSN :

1879-2448

Mot(s)-clé(s) en anglais :

I-THM
Chloramination
Chlorination
Disinfection by-products
Iodine
Oxidation
Drinking water

Discipline(s) HAL :

Chimie/Chimie analytique

Résumé en anglais : [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 ...
Lire la suite >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.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Date de dépôt :

2024-02-28T22:29:03Z
2024-03-19T13:23:24Z