title: Role of microbes in controlling the speciation of arsenic and production of arsines in contaminated soils.
abstract: The influence of microbes on the speciation of arsenic and production of arsines in contaminated soils was investigated under laboratory conditions. Microbes were able to carry out reactions that resulted in changes in the speciation of arsenic in soil. The transformation of soil dominating species, arsenate [As(V)], under both aerobic and anaerobic conditions to arsenite [As(III)], monomethylarsonic acid [MMAA], dimethylarsinic acid [DMAA] and to volatile trimethylarsine [TMA] was, however, less than 0.5%, of which the production of TMA represented 0.02-0.3%. The volatilization process was also verified in the field, in the soil of a dumping area. The 'life-time' of arsines in air was, however, short and they were rapidly converted back to water soluble species, As(V) and trimethyl arsine oxide (TMAO).
authors.affiliation: Department of Ecological and Environmental Sciences, University of Helsinki, Lahti, Finland. riina.turpeinen@helsinki.fi
authors.forename: Riina
authors.initials: R
authors.lastname: Turpeinen
authors.forename: Mari
authors.initials: M
authors.lastname: Pantsar-Kallio
authors.forename: Timo
authors.initials: T
authors.lastname: Kairesalo
mesh_terms: D001151:Arsenic / Q000378:metabolism*; D001152:Arsenicals / Q000032:analysis; D001711:Biotransformation; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D012995:Solubility
chemical_list: D001152:Arsenicals; D012989:Soil Pollutants; D001151:Arsenic; C006633:arsine