Journal article
Floodplain morphology influences arsenic and antimony spatial distribution in a seasonal acid sulfate soil wetland
Journal of hazardous materials, Vol.476, 135013
05/09/2024
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Abstract
Arsenic (As) and antimony (Sb) often co-occur in floodplain depositional environments that are contaminated by legacy mining activities. However, the distribution of As and Sb throughout floodplains is not uniform, adding complexity and expense to management or remediation processes. Identifying floodplain morphology predictor variables that help quantify and explain As and Sb spatial distribution on floodplains is useful for management and remediation. We developed As and Sb risk maps estimating concentration and availability at a coastal floodplain wetland impacted by upper-catchment mining. Significant predictors of As and Sb concentrations included i) distance from distributary channel-wetland intersection and ii) elevation. Distance from channel explained 53 % (P < 0.01) and 28 % (P < 0.01), while elevation explained 42 % (P < 0.01) and 47 % (P < 0.01) of the variability in near-total Sb and As respectively. As had a higher extractability than Sb across all tested soil extractions, suggesting that As is more environmentally available. As and Sb dry mass estimates to a depth of 0.1 m scaled to the lower coastal Macleay floodplain ranged from 113–192 tonnes and 14–24 tonnes respectively. Landscape-scale modelling of metalloid distribution, informed by morphology variables, presented here may be a useful framework for the development of risk maps in other regions impacted by contaminated upper-catchment sediments.
Details
- Title
- Floodplain morphology influences arsenic and antimony spatial distribution in a seasonal acid sulfate soil wetland
- Creators
- Gretchen Wichman (Author) - Southern Cross UniversityScott G Johnston (Corresponding Author) - Southern Cross University, ScienceDamien T Maher (Author) - Southern Cross University, Faculty of Science and EngineeringEdward D Burton (Author) - Southern Cross University, Science
- Publication Details
- Journal of hazardous materials, Vol.476, 135013
- Publisher
- Elsevier BV
- Identifiers
- 991013201313602368
- Copyright
- © 2024 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article