Extraction of metals from mildly acidic tropical soils: interactions between chelating ligand, pH and soil type

Orr, Ryan, Hocking, Rosalie K., Pattison, Anthony, and Nelson, Paul N. (2020) Extraction of metals from mildly acidic tropical soils: interactions between chelating ligand, pH and soil type. Chemosphere, 248. 126060.

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Abstract

Naturally occurring and synthetic chelating ligands can act as suppressants for fungal pathogens, nematodes and weeds, based on their ability to alter micronutrient bioavailability in soil, particularly iron. Chelators are also used as detergents, for remediation of heavy metal contamination and for supplying metals as fertiliser. The aim of this work was to test the ability of chelators to solubilise metals, in particular iron, in tropical soils over an environmentally relevant pH range. Six topsoils from farms in North Queensland, Australia were adjusted to pH 5, 6 and 7 and then extracted with CaCl2, EDTA, DTPA, EDDHA and mimosine. The extracts were analysed for concentrations of aluminium, copper, iron, magnesium, manganese, potassium, strontium and zinc. EDDHA solubilised iron effectively under all of the conditions tested, indicating its likely suitability for pest suppression. The concentration of aluminium in EDDHA extracts was positively correlated with pH, and at pH 7 the concentration of aluminium was far greater than that of iron. An increase in the mobility of aluminium from EDDHA application to soil may lead to aluminium toxicity in plants, which should be considered further in any practical application of EDDHA. Mimosine, which is also a strong chelator, was a poor extractor of all metals, possibly due to adsorption to the soil.

Item ID: 62382
Item Type: Article (Research - C1)
ISSN: 1879-1298
Keywords: Pesticide; EDDHA; Iron; Aluminium mobilization; Mimosine
Copyright Information: © 2020 Elsevier Ltd. All rights reserved.
Funders: Hort Innovation
Projects and Grants: Hort Innovation grant number BA14014
Date Deposited: 03 Mar 2020 22:13
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050304 Soil Chemistry (excl Carbon Sequestration Science) @ 50%
05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050303 Soil Biology @ 25%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0706 Horticultural Production > 070603 Horticultural Crop Protection (Pests, Diseases and Weeds) @ 25%
SEO Codes: 82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8202 Horticultural Crops > 820214 Tropical Fruit @ 25%
96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960413 Control of Plant Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland @ 25%
96 ENVIRONMENT > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils @ 50%
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