Coagulation
of Iodide-Containing Resorcinol Solution
or Natural Waters with Ferric Chloride Can Produce Iodinated Coagulation
Byproducts
Shunke Ding
Yang Deng
Hongwei Li
Chao Fang
Naiyun Gao
Wenhai Chu
10.1021/acs.est.9b03671.s001
https://acs.figshare.com/articles/journal_contribution/Coagulation_of_Iodide-Containing_Resorcinol_Solution_or_Natural_Waters_with_Ferric_Chloride_Can_Produce_Iodinated_Coagulation_Byproducts/9956501
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 (FeCl<sub>3</sub>) 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 FeCl<sub>3</sub> 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 FeCl<sub>3</sub> 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.
2019-10-08 21:16:07
Coagulation
compound
I-CBP
iodide-containing resorcinol solution
oxidation
drinking water
formation
FeCl 3
I-DBP
reactive iodine species
ferric
gas chromatography mass-spectrometry
iodide-containing waters
Iodide-Containing Resorcinol Solution