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Effects of redox on mercury transfor...

Rallabandi, Soujanya L.

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Effects of redox on mercury transformations in riverbank soils.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of redox on mercury transformations in riverbank soils./
Author:	Rallabandi, Soujanya L.
Description:	74 p.
Notes:	Source: Masters Abstracts International, Volume: 43-03, page: 0799.
Contained By:	Masters Abstracts International43-03.
Subject:	Biogeochemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1423495
ISBN:	0496101412

Effects of redox on mercury transformations in riverbank soils.
Rallabandi, Soujanya L.

Effects of redox on mercury transformations in riverbank soils. - 74 p.

Source: Masters Abstracts International, Volume: 43-03, page: 0799.

Thesis (M.S.)--University of Massachusetts Lowell, 2004.

Mercury threatens environmental and human health. The competing bacterial processes of MeHg production and consumption control MeHg concentrations in the environment. Riverbank samples were incubated under various conditions with 14C-MeHg and the rates of demethylation and the relative proportions of 14CO2 and 14CH 4 determined. Methylation was determined using 203Hg. Wet soils exhibited oxidative demethylation, under aerobic and anaerobic conditions whereas dry soils displayed only the reductive path. The induction of the reductive path was almost immediate after drying, while re-establishment of conditions conducive to the oxidative path required several weeks before demethylation became oxidative. Hg methylation occurred only anaerobically, but soils held under oxic conditions for months regained the methylation ability rapidly when anoxia was restored. Hydrologic changes in riverbanks greatly affect the fate of Hg, but the kinetics vary greatly depending on the history of flooding and drying, which may drastically affect MeHg transport.

ISBN: 0496101412Subjects--Topical Terms:

545717
Biogeochemistry.

Effects of redox on mercury transformations in riverbank soils.
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100 1 $a Rallabandi, Soujanya L. $3 1903501
245 1 0 $a Effects of redox on mercury transformations in riverbank soils.
300 $a 74 p.
500 $a Source: Masters Abstracts International, Volume: 43-03, page: 0799.
500 $a Supervisor: Mark E. Hines.
502 $a Thesis (M.S.)--University of Massachusetts Lowell, 2004.
520 $a Mercury threatens environmental and human health. The competing bacterial processes of MeHg production and consumption control MeHg concentrations in the environment. Riverbank samples were incubated under various conditions with 14C-MeHg and the rates of demethylation and the relative proportions of 14CO2 and 14CH 4 determined. Methylation was determined using 203Hg. Wet soils exhibited oxidative demethylation, under aerobic and anaerobic conditions whereas dry soils displayed only the reductive path. The induction of the reductive path was almost immediate after drying, while re-establishment of conditions conducive to the oxidative path required several weeks before demethylation became oxidative. Hg methylation occurred only anaerobically, but soils held under oxic conditions for months regained the methylation ability rapidly when anoxia was restored. Hydrologic changes in riverbanks greatly affect the fate of Hg, but the kinetics vary greatly depending on the history of flooding and drying, which may drastically affect MeHg transport.
590 $a School code: 0111.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Environmental Sciences. $3 676987
650 4 $a Biology, Ecology. $3 1017726
690 $a 0425
690 $a 0768
690 $a 0329
710 2 0 $a University of Massachusetts Lowell. $3 1017839
773 0 $t Masters Abstracts International $g 43-03.
790 1 0 $a Hines, Mark E., $e advisor
790 $a 0111
791 $a M.S.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1423495