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Mercury distribution, speciation and...

King, Susan Ann.

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Mercury distribution, speciation and transport in the Everglades Nutrient Removal treatment wetland.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Mercury distribution, speciation and transport in the Everglades Nutrient Removal treatment wetland./
作者:	King, Susan Ann.
面頁冊數:	130 p.
附註:	Source: Dissertation Abstracts International, Volume: 61-05, Section: B, page: 2450.
Contained By:	Dissertation Abstracts International61-05B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9972858
ISBN:	059978220X

Mercury distribution, speciation and transport in the Everglades Nutrient Removal treatment wetland.
King, Susan Ann.

Mercury distribution, speciation and transport in the Everglades Nutrient Removal treatment wetland. - 130 p.

Source: Dissertation Abstracts International, Volume: 61-05, Section: B, page: 2450.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2000.

Studies of mercury (Hg) cycling in the peats of Everglades Nutrient Removal (ENR) treatment wetland revealed that total mercury (THg, the sum of all Hg species) and monomethylmercury (MeHg) show spatial and temporal trends that are linked to hydrology, geochemistry and season. Sediment THg varied little across ENR sampling sites, but sediment MeHg at sites with upwelling groundwaters differed from sites with downwelling or little groundwater fluxes. Vertical hydrologic fluxes, surface water residence times and season appeared to influence MeHg levels in surface waters and near-surface sediments. Sulfate availability to sulfate reducing bacteria in sediments did not explain temporal or spatial variability of MeHg in sediment, nor did sediment temperature differences. Flux calculations and MeHg mass balance comparisons revealed that estimated annual transport of MeHg from wetland peat into ENR surface waters amounts to up to 92% of the net amount of MeHg stored in the peat. Seepage of MeHg from the ENR wetland did not occur due to rapid demethylation of MeHg in downward advecting pore waters.

ISBN: 059978220XSubjects--Topical Terms:

545717
Biogeochemistry.

Mercury distribution, speciation and transport in the Everglades Nutrient Removal treatment wetland.
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502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2000.
520 $a Studies of mercury (Hg) cycling in the peats of Everglades Nutrient Removal (ENR) treatment wetland revealed that total mercury (THg, the sum of all Hg species) and monomethylmercury (MeHg) show spatial and temporal trends that are linked to hydrology, geochemistry and season. Sediment THg varied little across ENR sampling sites, but sediment MeHg at sites with upwelling groundwaters differed from sites with downwelling or little groundwater fluxes. Vertical hydrologic fluxes, surface water residence times and season appeared to influence MeHg levels in surface waters and near-surface sediments. Sulfate availability to sulfate reducing bacteria in sediments did not explain temporal or spatial variability of MeHg in sediment, nor did sediment temperature differences. Flux calculations and MeHg mass balance comparisons revealed that estimated annual transport of MeHg from wetland peat into ENR surface waters amounts to up to 92% of the net amount of MeHg stored in the peat. Seepage of MeHg from the ENR wetland did not occur due to rapid demethylation of MeHg in downward advecting pore waters.
520 $a Pore water THg correlated (R<super>2</super> = 0.70) with dissolved organic carbon (DOC) pore water levels; however, a speciation model based on experimentally-derived constants for Hg-organic colloid associations, DOC levels, and measured pore water sulfide revealed that Hg-sulfide species likely control the partitioning behavior of THg in ENR wetland peat when sulfate levels are 10<super>–5 </super> M or greater and DOC levels are 100 mg/L or lower. Pore water flux calculations and THg mass balance comparisons revealed that THg fluxes to surface waters are small relative to atmospheric deposition and agricultural runoff inputs. Estimates of pore water mercury fluxes varied by a factor of 10 when THg and MeHg fluxes were modeled as various potential mercury species. Downward advective groundwater fluxes reduced the net annual flux of pore water THg and MeHg into ENR wetland surface waters.
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