Coagulation of Iodide-Containing Resorcinol Solution or Natural Waters with Ferric Chloride Can Produce Iodinated Coagulation Byproducts
Document Type
Article
Publication Date
11-5-2019
Journal / Book Title
Environmental Science and Technology
Abstract
Iodinated disinfection byproducts (I-DBPs) are of particular concern in drinking water due to the more cytotoxic and genotoxic properties than their chlorinated and brominated analogs. Formation of I-DBP primarily results from the oxidation of iodide-containing waters with various oxidants and the chlor(am)ination of iodinated organic compounds in drinking water. This study first reports that ferric chloride (FeCl3) can lead to the formation of iodinated coagulation byproducts (I-CBPs) from iodide-containing resorcinol solution or natural waters. The unwanted I-CBP formation involved the oxidation of iodide by ferric ions to generate various reactive iodine species, which further oxidize organic compounds. Although the oxidation rate of iodide by FeCl3 was several orders of magnitude slower than that by chlorine or chloramine, most of the converted iodide under the ferric/iodide system was transformed into iodine and iodinated organic compounds rather than iodate. Formation of four aliphatic I-CBPs was observed, and four aromatic I-CBPs were identified by gas chromatography mass-spectrometry and theoretical calculation. Coagulation of iodide-containing waters with FeCl3 also produced I-CBPs ranging from 12.5 ± 0.8 to 32.5 ± 0.2 μg/L as I. These findings call for careful consideration of the formation of I-CBPs from coagulation of iodide-containing waters with ferric salts.
DOI
10.1021/acs.est.9b03671
Journal ISSN / Book ISBN
85073147880 (Scopus)
MSU Digital Commons Citation
Ding, Shunke; Deng, Yang; Li, Hongwei; Fang, Chao; Gao, Naiyun; and Chu, Wenhai, "Coagulation of Iodide-Containing Resorcinol Solution or Natural Waters with Ferric Chloride Can Produce Iodinated Coagulation Byproducts" (2019). Department of Earth and Environmental Studies Faculty Scholarship and Creative Works. 706.
https://digitalcommons.montclair.edu/earth-environ-studies-facpubs/706
Published Citation
Ding, S., Deng, Y., Li, H., Fang, C., Gao, N., & Chu, W. (2019). Coagulation of iodide-containing resorcinol solution or natural waters with ferric chloride can produce iodinated coagulation byproducts. Environmental Science & Technology, 53(21), 12407-12415.