Chapter 31 Arsenic speciation in soils: an analytical challenge for understanding arsenic biogeochemistry

摘要: Abstract The mobility, fate, bioavailability, and overall biogeochemical cycling of arsenic in soil depend on the individual form which exists as well physical chemical characteristics soil. Speciation analysis poses a great challenge is key to understand biogeochemistry soils sediments. speciation may be defined functionally (e.g., bioavailable fraction), operationally, or species-specifically. extraction species from solid matrices generally constitutes critical step for Various sequential procedures have been developed extract operationally such water soluble, exchangeable, Fe/Mn oxides associated, organic matter bound, residual fractions. Several extractants used leach chemically specific species, mainly arsenite, arsenate, monomethylarsonic acid (MMA), dimethylarsinic (DMA) matrix. Efforts made preserve integrity during extraction. In this paper, with emphasis selection chemical-species specifically were reviewed. addition, method evaluating spectroscopic technique directly measuring briefly discussed.