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Formation of Iodinated Trihalomethane Disinfection By-products by Co-oxidation of Natural Organic Matter with Sodium Hypochlorite and Lead Dioxide

查看全文 作　　者：WANG [1,2]Junyao;HU [1,2]Xialin;LIU [3]Meichuan;YIN [1,2]Daqiang 高影响力作者 机构地区：[1]Key Labatory of Yangtze River Water Environment,Ministry of Education,College of Environmental Science and Engineering,Tongji University,Shanghai,200092,P.R.China;[2]Shanghai Institute of Pollution Control and Ecological Security,Tongji University,Shanghai,200092,P.R.China;[3]School of Chemical Science and Engineering,Shanghai Key Lab of Chemical Assessment and Sustainability,Tongji University,Shanghai,200092,P.R.China高影响力机构 出　　处：《Chemical Research in Chinese Universities》索引2023年第39卷第3期,共6页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(No.22076141);the Fundamental Research Funds for the Central Universities,China(No.2022-4-YB-13). 摘　　要：Iodinated trihalomethanes(I-THMs)in drinking water pipelines have attracted wide attention due to their high toxicity.The coexistence of widely present lead dioxide(PbO_(2))with commonly used disinfectant sodium hypochlorite(NaClO)in drinking water might change the formation characteristics of I-THMs due to the strongly oxidizing properties of PbO_(2).This study investigated the formation of I-THMs during the co-oxidation of natural organic matter including humic acid(HA),extracellular organic matter(EOM),and intracellular organic matter(IOM)of algogenic organic matter by PbO_(2) and NaClO.Triiodomethane(CHI_(3))is the dominant product in the single oxidation system of PbO_(2),whereas trichloromethane(CHCl_(3)),chlorodiiodomethane(CHClI_(2)),and dichloroiodomethane(CHCl2I)are the major products in the single NaClO system.In the co-oxidation system,the dominant I-THMs are similar to those in the single NaClO system.However,the CHCl_(3) content decreased to 56.4%whereas I-THMs concentrations remained unchanged with the increase of PbO_(2) concentration.The main reason is attributed to the reduced residual chlorine content due to the reaction of PbO_(2) with NaClO.IOM is more prone to forming I-THMs than HA and EOM due to the specified structures.This study suggested that PbO_(2) in the drinking water supply pipelines might change the risk of THMs. 关 键 词：Lead dioxide Iodinated trihalomethane Humic acid Algogenic organic matter
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