Speciation and mobility of cadmium in straw and wood combustion fly ash
2001; Elsevier BV; Volume: 45; Issue: 1 Linguagem: Inglês
10.1016/s0045-6535(01)00026-1
ISSN1879-1298
AutoresHenrik K. Hansen, Anne Juul Pedersen, Lisbeth M. Ottosen, Arne Villumsen,
Tópico(s)Mercury impact and mitigation studies
ResumoTwo 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 CdCl2. 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 CdSiO3. Long-term effects and accumulation of cadmium could be a problem when adding this fly ash to agricultural or forest soils.
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