title: Adsorption and mobility of metals in build-up on road surfaces.
abstract: The study investigated the adsorption and bioavailability characteristics of traffic generated metals common to urban land uses, in road deposited solids particles. To validate the outcomes derived from the analysis of field samples, adsorption and desorption experiments were undertaken. The analysis of field samples revealed that metals are selectively adsorbed to different charge sites on solids. Zinc, copper, lead and nickel are adsorbed preferentially to oxides of manganese, iron and aluminium. Lead is adsorbed to organic matter through chemisorption. Cadmium and chromium form weak bonding through cation exchange with most of the particle sizes. Adsorption and desorption experiments revealed that at high metal concentrations, chromium, copper and lead form relatively strong bonds with solids particles while zinc is adsorbed through cation exchange with high likelihood of being released back into solution. Outcomes from this study provide specific guidance for the removal of metals from stormwater based on solids removal.
authors.affiliation: Engineering Faculty, South Eastern University of Sri Lanka, University Park, Oluvil 32360, Sri Lanka. Electronic address: thanujaguna@yahoo.com.
authors.forename: Chandima
authors.initials: C
authors.lastname: Gunawardana
authors.affiliation: Science and Engineering Faculty, Queensland University of Technology, G.P.O. Box 2434, Brisbane, QLD 4001, Australia. Electronic address: p.egodawatta@qut.edu.au.
authors.forename: Prasanna
authors.initials: P
authors.lastname: Egodawatta
authors.affiliation: Science and Engineering Faculty, Queensland University of Technology, G.P.O. Box 2434, Brisbane, QLD 4001, Australia. Electronic address: a.goonetilleke@qut.edu.au.
authors.forename: Ashantha
authors.initials: A
authors.lastname: Goonetilleke
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D000077215:Clay; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D010316:Particle Size; D025341:Principal Component Analysis; D011793:Queensland; D014186:Transportation
chemical_list: D000538:Aluminum Silicates; D004785:Environmental Pollutants; D019216:Metals, Heavy; D000077215:Clay
keywords: Adsorption; Desorption; Stormwater pollutant processes; Stormwater quality; Traffic generated metals