ISSN:
0268-2605
Keywords:
Inorganic arsenic
;
methylated arsenic
;
porewaters
;
dialysis membrane filtration
;
hydride generation
;
liquid nitrogen trapping
;
coupled gas chromatography-atomic absorption spectroscopy
;
arsenic methylation
;
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Inorganic arsenic, monomethylarsenic and dimethylarsenic species have been observed in samples of sediment porewater collected from the Tamar Estuary in South-West England. Porewater samples were collected using in situ dialysis. The arsenic species were separated by hydride generation and concentrated by liquid nitrogen trapping, prior to analysis by directly coupled gas chromatography-atomic absorption spectroscopy. The predominant dissolved arsenic species present was inorganic arsenic (5-62 m̈g dm-3). However, this is the first time significant concentrations of methylated arsenic species have been quantified in estuarine porewaters (0.04-0.70 m̈g dm-3), accounting for between 1 and 4% of the total dissolved arsenic. The presence of methylated arsenic compounds in porewaters is attributed to in situ environmental methylation, although the possibility of methylated arsenic species being derived from biological debris cannot be excluded.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aoc.590010507
Permalink
