Huang, J-H; Scherr, F; Matzner, E: Demethylation of dimethylarsinic acid and arsenobetaine in different organic soils, Water, Air and Soil Pollution, 182, 31-41 (2007), doi:10.1007/s11270-006-9318-4
Abstract:
Abstract Methylation and demethylation of arsenic may change substantially the toxicity and mobility of arsenic in soils. Little is known about demethylation of organic arsenic species in organic soils. We incubated dimethylarsinic acid (DMA) and arsenobetaine (AsB) in soils and aqueous soil extracts from a forest floor and fen, in order to investigate demethylation processes. Incubations were conducted at 5°C in the dark under oxic or anoxic conditions. Arsenobetaine demethylated rapidly in all soil extracts with half-lives of 3.6–12 days, estimated from first order kinetic. Demethylation of DMA was relatively slow with half-lives of 187 and 46 days in the forest floor extracts and oxic fen extracts, respectively. In comparison, DMA was stable for 100 days in anoxic fen extracts. The apparent half-lives were much shorter in soils for DMA (1.3–12.6 days) and AsB (0.5–1.9 days) than in soil extracts, suggesting also irreversible AsB and DMA adsorption to soils beside demethylation. An unknown arsenic species and DMA were detected as metabolites of AsB demethylation. The results indicate rapid demethylation of AsB probably via the pathway AsB → Dimethylarsenoylacetate → DMA, followed up by slow demethylation of DMA → monomethylarsonic acid → inorganic As species. Keywords arsenic - methylation - demethylation - forest floor - fen
Aktuelle Termine


BayCEER-Kolloquium:
Do. 23.01.2020
Understanding biodiversity dynamics – from human dominated systems to the fossil record
Do. 30.01.2020
BayCEER Mitgliederversammlung
Do. 23.04.2020
Physical constraints and biological controls of plant-environment interactions
Geographisches Kolloquium:
Di. 28.01.2020
Adivasis in the Anthropocene - What an Environmental History of Eastern India can tell us about the global agricultural and food crisis
Ökologisch-Botanischer Garten:
So. 02.02.2020
Mehr als Sonne und Strand: Pflanzen der Karibik
BayCEER Blog
13.01.2020
Why Science Communication?
24.05.2019
Stoichiometric controls of C and N cycling
07.05.2019
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
07.05.2019
EGU – interesting research and free coffee
RSS Blog als RSS Feed
Wetter Versuchsflächen
Luftdruck (356m): 1001.5 hPa
Lufttemperatur: -2.5 °C
Niederschlag: 0.2 mm/24h
Sonnenschein: 6 h/d
Wind (Höhe 17m): 2.6 km/h
Wind (Max.): 4.3 km/h
Windrichtung: SO

...mehr
Globalstrahlung: -1 W/m²
Lufttemperatur: -3.2 °C
Niederschlag: 3.3 mm/24h
Sonnenschein: 2 h/d
Wind (Höhe 32m): 3.5 km/h

...mehr
Diese Webseite verwendet Cookies. weitere Informationen