Journal article
Evaluation of amendments to reduce arsenic and antimony leaching from co-contaminated soils
Chemosphere (Oxford), Vol.174, pp.208-217
05/2017
PMID: 28167352
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Source: InCites
Abstract
Co-contamination of soils with arsenic (As) and antimony (Sb) presents unique challenges for risk management. In this study a sequence of leaching experiments evaluated zero valent iron powder, ferrihydrite, ferric chloride, aluminium and manganese oxides, and kaolinite for As and Sb immobilisation in co-contaminated soils. Iron based amendments were most effective for the reduction of As and Sb in leachate in a column leaching study. Over 48 h zero valent iron powder and ferrihydrite applied at 3% (w/w dry weight) were most efficient, decreasing total As and Sb leachate concentrations by more than 80%. Careful moderation of pH (to > 2.5 but < ∼6) with lime was required for effective co-immobilisation of both metalloids using ferric chloride. In a subsequent batch study with pH optimised for maximum sorption using 2% lime, ferric chloride (3%) added to two co-contaminated soils decreased As and Sb in solution after 7 days by at least 79%. Ferrihydrite (3%) and iron powder (3%) were less effective. Ferrihydrite (3%) was then used in a 12-week larger scale Cynodon dactylon plant experiment that also considered plant bioavailability. Porewater As and Sb decreased by up to 90% but over the 12 week trial period no significant change in shoot or root metalloid concentrations was observed. The study demonstrates that iron-based amendments can be extremely effective for co-immobilisation of As and Sb in contaminated soils, but for large scale application amendment feasibility considerations and site specific pH moderation are essential.
Details
- Title
- Evaluation of amendments to reduce arsenic and antimony leaching from co-contaminated soils
- Creators
- Steven J Doherty - University of New EnglandMatthew K Tighe - University of New EnglandSusan C Wilson - University of New England
- Publication Details
- Chemosphere (Oxford), Vol.174, pp.208-217
- Publisher
- Elsevier
- Identifiers
- 991013101613202368
- Copyright
- © 2017 Elsevier Ltd. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article