Stabilization of metal(loid)s in two contaminated agricultural soils: Comparing biochar to its non-pyrolysed source material
Language English Country England, Great Britain Media print-electronic
Document type Journal Article
PubMed
28437740
DOI
10.1016/j.chemosphere.2017.04.064
PII: S0045-6535(17)30600-8
Knihovny.cz E-resources
- Keywords
- Biochar, Chromium, Plant uptake, Pore water, Speciation, Zinc,
- MeSH
- Biomass MeSH
- Water Pollutants, Chemical MeSH
- Charcoal * MeSH
- Lolium metabolism MeSH
- Metals pharmacokinetics MeSH
- Soil Pollutants pharmacokinetics MeSH
- Soil chemistry MeSH
- Plant Stems MeSH
- Vitis MeSH
- Agriculture MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- biochar MeSH Browser
- Water Pollutants, Chemical MeSH
- Charcoal * MeSH
- Metals MeSH
- Soil Pollutants MeSH
- Soil MeSH
Two metal(loid) contaminated agricultural soils were amended with grape stalk (wine production by-product)-derived biochar as well as its pre-pyrolysed origin material, to investigate their geochemical impacts on As, Cr, Cu and Zn. Detailed physico-chemical evaluation combined with a column leaching test determined the retention of metal(loid)s from soil solution by each amendments. A pot experiment measured metal(loid)s in soil pore water and their uptake to ryegrass when the amendments were mixed into soils at 1 and 5% (w/w). Total Cr and Zn concentrations were reduced furthest in column leachates by the addition of raw material and biochar respectively, compared to the untreated soil; Cr(III) was the predominant specie initially due to rapid acidification of leachates and organic complexation resulting from raw material addition. Loadings of metal(loid)s to the amendments recovered from the post-leached columns were in the order Cu » Zn > Cr ≈ As. In the pot test ryegrass Cr uptake was initiated by the addition of both amendments, compared to the untreated soil, whereas only biochar addition resulted in significant increases in Zn uptake, explained by its significant enhancement of ryegrass biomass yield, especially at 5% dosage; raw material addition significantly decreased biomass yields. Inconsistent relationships between pore water parameters and ryegrass uptake were common to both soils investigated. Therefore, whilst both amendments modified soil metal(loid) geochemistry, their effects differed fundamentally; in environmental risk management terms these results highlight the need to investigate the detailed geochemical response of contaminated soils to diverse organic amendment additions.
CREAF Campus de Bellaterra 08193 Cerdanyola Barcelona Spain
The James Hutton Institute Craigiebuckler Aberdeen AB15 8QH UK
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