Speciation and mobility of cadmium in straw and wood combustion fly ash

Two fly ashes from biomass combustion have been analysed regarding cadmium speciation and mobility. A fly ash from straw combustion contained 10 mg Cd/kg dry matter, and around 50% of the cadmium was leachable in water. The possible main speciation of cadmium in this fly ash was CdCl 2. When adding...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2001-10, Vol.45 (1), p.123-128
Main Authors: Hansen, Henrik K., Pedersen, Anne J., Ottosen, Lisbeth M., Villumsen, Arne
Format: Article
Language:English
Subjects:
Agriculture
Applied sciences
Biomass
Cadmium
Cadmium - analysis
Desorption
Environmental Monitoring
Exact sciences and technology
Fly ash
Incineration
Other industrial wastes. Sewage sludge
Pollution
Refuse Disposal
Sequential extraction
Soil Pollutants - analysis
Speciation
Trees
Wastes
Water Pollutants - analysis
Wood
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Summary:Two fly ashes from biomass combustion have been analysed regarding cadmium speciation and mobility. A fly ash from straw combustion contained 10 mg Cd/kg dry matter, and around 50% of the cadmium was leachable in water. The possible main speciation of cadmium in this fly ash was CdCl 2. When adding this fly ash to agricultural soil a threat for groundwater contamination and plant uptake is existing. A fly ash from wood chip combustion had 28.6 mg Cd/kg dry matter. In this fly ash, the cadmium was bound more heavily, with only small amounts of cadmium leached in mild extractants. A possible speciation of cadmium in this fly ash was as oxide or as CdSiO 3. Long-term effects and accumulation of cadmium could be a problem when adding this fly ash to agricultural or forest soils.
ISSN:0045-6535
1879-1298
DOI:10.1016/S0045-6535(01)00026-1