Arsenic mobility in brownfield soils amended with green waste compost or biochar and planted with Miscanthus

Degraded land that is historically contaminated from different sources of industrial waste provides an opportunity for conversion to bioenergy fuel production and also to increase sequestration of carbon in soil through organic amendments. In pot experiments, As mobility was investigated in three di...

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Bibliographic Details
Published in:Environmental pollution (1987) 2009-10, Vol.157 (10), p.2654-2662
Main Authors: Hartley, William, Dickinson, Nicholas M., Riby, Philip, Lepp, Nicholas W.
Format: Article
Language:English
Subjects:
Adsorption
Animal, plant and microbial ecology
Applied ecology
arsenic
Arsenic - chemistry
Arsenic - metabolism
Arsenic transfer
bioavailability
Biochar
Bioenergy crop
Biological and medical sciences
brownfields
Charcoal - chemistry
composts
Ecotoxicology, biological effects of pollution
Environmental Restoration and Remediation - methods
Fundamental and applied biological sciences. Psychology
General aspects
Green waste compost
Iron
Miscanthus
plant growth
Poaceae - metabolism
polluted soils
soil amendments
soil organic carbon
Soil Pollutants - chemistry
Soil Pollutants - metabolism
soil pollution
soil properties
Water-soluble organic carbon
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Summary:Degraded land that is historically contaminated from different sources of industrial waste provides an opportunity for conversion to bioenergy fuel production and also to increase sequestration of carbon in soil through organic amendments. In pot experiments, As mobility was investigated in three different brownfield soils amended with green waste compost (GWC, 30% v/v) or biochar (BC, 20% v/v), planted with Miscanthus. Using GWC improved crop yield but had little effect on foliar As uptake, although the proportion of As transferred from roots to foliage differed considerably between the three soils. It also increased dissolved carbon concentrations in soil pore water that influenced Fe and As mobility. Effects of BC were less pronounced, but the impacts of both amendments on SOC, Fe, P and pH are likely to be critical in the context of As leaching to ground water. Growing Miscanthus had no measurable effect on As mobility. Green waste compost enhances water-soluble iron, phosphorus and carbon, increasing arsenic mobility in soil pore water.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2009.05.011