Turpeinen Riina, Pantsar-Kallio Mari, Kairesalo Timo
Department of Ecological and Environmental Sciences, University of Helsinki, Lahti, Finland.
Sci Total Environ. 2002 Feb 21;285(1-3):133-45. doi: 10.1016/s0048-9697(01)00903-2.
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).
在实验室条件下，研究了微生物对污染土壤中砷形态及胂类化合物产生的影响。微生物能够进行导致土壤中砷形态发生变化的反应。然而，在有氧和无氧条件下，土壤中的主要形态砷酸盐[As(V)]转化为亚砷酸盐[As(III)]、一甲基胂酸[MMAA]、二甲基胂酸[DMAA]以及挥发性三甲基胂[TMA]的转化率均低于0.5%，其中TMA的生成量占0.02 - 0.3%。在一个倾倒区的土壤中进行的实地研究也证实了胂类化合物的挥发过程。然而，胂类化合物在空气中的“寿命”很短，它们会迅速转化回水溶性形态，即As(V)和三甲基胂氧化物(TMAO)。
