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Cadmium and lead contamination of soils near plastic stabilizing materials producing plants in Northern Taiwan 总被引：3，自引：0，他引：3
Atmospheric mobilization and exchange at the air-water interface are significant features of biogeochemical cycling of Hg
at the Earth's surface. Our marine studies of Hg have been extended to terrestrial aquatic systems, where we are investigating
the tropospheric cycling, deposition and air-water exchange of Hg in the mid-continental lacustrine environs of northcentral
Wisconsin. This program is part of a multidisciplinary examination into the processes regulating the aquatic biogeochemistry
of Hg in temperate regions. Trace-metal-free methodologies are employed to determine Hg and alkylated Hg species at the picomolar
level in air, water and precipitation. We have found Hg concentrations and atmospheric fluxes in these fresh water systems
to be similar to open ocean regions of the Northern Hemisphere. A well constrained mass balance for Hg has been developed
for one of the lakes, Little Rock Lake, which is an extensively studied clear water seepage lake that has been divided with
a sea curtain into two basins, one of which is untreated (reference pH: 6.1) while the other is being experimentally acidified
(current pH: 4.7). This budget shows that the measured total atmospheric Hg deposition (ca. 10 μg m−2 yr−1) readily accounts for the total mass of Hg in fish, water and accumulating in the sediments of Little Rock Lake. This analysis
demonstrates the importance of atmospheric Hg depositional fluxes to the geochemical cycling and bioaccumulation of Hg in
temperate lakes. It further suggests that modest increases in atmospheric Hg loading could lead directly to enhanced levels
of Hg in biota. Analogous modeling for monomethylmercury (MMHg) is as yet limited. Nevertheless, preliminary data for the
atmospheric deposition of MMHg indicate that this flux is insufficient. to account for the amounts of MMHg observed in biota.
An in-lake synthesis of MMHg is implicated. The importance of volatile Hg which is principally in the elemental form, and
its evasion to the atmosphere is also illustrated. We suggest that the in-lake production of Hg° can reduce the Hg (II) substrate
used in the in-lake microbiological synthesis of MMHg. 相似文献
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