Differential release of sewage sludge biochar-borne elements by common low-molecular-weight organic acids

Vause, D, Heaney, N and Lin, C 2018, 'Differential release of sewage sludge biochar-borne elements by common low-molecular-weight organic acids' , Ecotoxicology and Environmental Safety, 165 , pp. 219-223.

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Abstract

Biochar materials originated from sewage sludge may contain elevated levels of potentially toxic elements. There was a lack of information on the mobility of biochar-borne elements, as driven by lowmolecular-weight organic acids (LMWOAs) contained in plant root exudates. A batch experiment was conducted to examine the effects of three common LMWOAs on the release of major elements and trace elements with a focus on various potentially toxic trace elements. The results showed that substantial amounts of Al, Mn, Fe, K, Na and Mg were extracted from two sewage sludge-derived biochar materials by the LMWOAs. A much higher release rate of potentially toxic trace elements was observed in the presence of LMWOAs, as compared to reported data using extractants not encountered in root exudates. The LMWOA-driven releasibility of various potentially toxic trace elements was in the following decreasing order: Zn > Ni > Pb > Cu > Cr > Co = Cd. Other trace elements that are subject to mobilization in the presence of LMWOAs included B, Ba, In, Li and Sr except Ba under oxalic acid extraction. Among the three LMWOAs, oxalic acid showed a generally stronger capacity to mobilize these metals. The findings obtained from this study provides new information that can be used for better evaluating the phyto-availability of trace elements bound to sewage sludge-originated biochar materials.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Journal or Publication Title: Ecotoxicology and Environmental Safety
Publisher: Elsevier
ISSN: 0147-6513
Related URLs:
Depositing User: C Lin
Date Deposited: 10 Sep 2018 15:08
Last Modified: 09 Mar 2020 09:07
URI: http://usir.salford.ac.uk/id/eprint/48283

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