Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/53957
Title: Arsenic and cadmium leaching in co-contaminated agronomic soil and the influence of high rainfall and amendments
Contributor(s): Gunadasa, Sajanee G  (author)orcid ; Tighe, Matthew K  (author)orcid ; Wilson, Susan C  (author)orcid 
Publication Date: 2023-01-01
Early Online Version: 2022-11-05
DOI: 10.1016/j.envpol.2022.120591
Handle Link: https://hdl.handle.net/1959.11/53957
Abstract: 

Arsenic (As) and cadmium (Cd) co-contaminate agricultural systems worldwide and threaten water resources, food security and human health. This column leaching study examined As and Cd mobility in an acidic sandy loam Alfisol soil collected from the dry zone of Sri Lankafor four co-contaminant concentration combinations (spiked and 1 year aged As at 20 & 100 mg kg-1 with co-added Cd at 3 & 20 mg kg-1) i, and under the influence of high rainfall (RF), phosphorus fertilizer (P) and lime amendments. In almost all treatments a synergistic co-contaminant adsorption effect was evident which reduced leaching of both elements, significantly in the higher spiked soil concentration treatments. The magnitude of leaching decrease varied with treatment but was greater for As due to its weaker retention in the soil. The co-sorbing effects, evident even under RF, were attributed to electrostatic sorption interactions, the formation of ternary bridging complexes and surface precipitation at higher concentrations. Liming significantly retarded mobilisation of both elements in all treatments, whereas P enhanced As leaching but suppressed Cd leaching, and both amendments moderated co-contaminant effects. An antagonistic effect of Cd on As sorption was evident in two treatments which showed increased As leaching with added Cd: the RF low spike concentration treatment, accredited to washout of stable As–Cd soluble complexes; the P high concentration treatment considered due to P disruption of As–Cd bridging complexes. This work is important for effective risk mitigation in these widely occurring co-contaminated agronomic systems, and demonstrates a strong system effect on synergistic or antagonistic co-contaminant interactions.

Publication Type: Journal Article
Source of Publication: Environmental Pollution, 316(Part 2), p. 1-15
Publisher: Elsevier Ltd
Place of Publication: United Kingdom
ISSN: 1873-6424
0269-7491
Fields of Research (FoR) 2020: 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
410402 Environmental assessment and monitoring
Socio-Economic Objective (SEO) 2020: 180601 Assessment and management of terrestrial ecosystems
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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