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Arsenic Geochemistry in a controlled Marine Ecosystem

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Title Arsenic Geochemistry in a controlled Marine Ecosystem
 
Creator Windom, Herbert L
Sanders, James G
 
Description 309-313
Arsenic added to controlled enclosures changed in chemical speciation as predicted from laboratory measurements. The reduction of As(V)and production of As(111) and DMA (dimethylarsinic acid) in the As(V) enriched enclosure resulted in As species in proportions very similar to those measured in productive coastal marine systems. Further, the rates of As(V) reduction were remarkably similar to those measured in phytoplankton cultures exposed to As(V). Arsenite in the As(111) enriched enclosure was oxidized at a rate similar to that calculated in the laboratory. Microbial activity and the presence of dissolved organic matter could have contributed to the oxidation. The results support earlier suggestions thatbiota mediate and control the rate of As(V) reduction in marine systems. It is suggested that the concentration of As(111) is probably controlled by both chemical oxidation and the biota, and is in equilibrium between them. However, the importance of microbial oxidation and dissolved organic matter catalysis should not be ignored and needs further study.
 
Date 2016-12-22T09:34:45Z
2016-12-22T09:34:45Z
1981-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/39102
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.10(4) [December 1981]