Assessment of heavy metals mobilization in road-deposited sediments induced by COVID-19 disinfection

•Effect of chlorinated disinfectants (CDs) on metals in road sediments was analyzed.•CDs exposure increased leaching of Cd, Cr, Ni and Zn in road sediments.•CDs exposure changed the chemical forms of metal elements.•The lower ORP and alkalinity of CDs cause variation in metal forms and leaching.•Met...

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Bibliographic Details
Published in:Water research (Oxford) 2023-09, Vol.243, p.120393-120393, Article 120393
Main Authors: Hu, Lian, Mao, Jintao, Zhong, Ronghua, Zhao, Hongtao
Format: Article
Language:English
Subjects:
Chlorinated disinfectant
COVID-19
Heavy metals
Priming effects
Road-deposited sediments
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Summary:•Effect of chlorinated disinfectants (CDs) on metals in road sediments was analyzed.•CDs exposure increased leaching of Cd, Cr, Ni and Zn in road sediments.•CDs exposure changed the chemical forms of metal elements.•The lower ORP and alkalinity of CDs cause variation in metal forms and leaching.•Metal leaching and forms vary with particle size, CDs concentration, and element type. Road-deposited sediments (RDS) on urban impervious surfaces are important carriers of heavy metals (HMs), and can contribute to urban runoff pollution. With the outbreak of COVID-19, chlorinated disinfectants (CDs) have been extensively sprayed on these surfaces. This practice may have a superposed or priming effect on HMs contaminants in RDS, yet this remains unknown. This study examined the effects of seven CDs concentration gradients (0, 250, 500, 1000, 2000, 5000, 60,000 mg/L) on the leaching and chemical forms of HMs (Cd, Cr, Ni, Pb, and Zn) in seven particle size fractions (
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2023.120393