Recent declines in atmospheric mercury deposition in the Upper Midwest

Article Abstract:

Sediment core samples were used to assess atmospheric mercury deposition in the Upper Midwest. Core samples from study lakes in eastern and western Minnesota, Minneapolis and southeastern Alaska showed a decreasing pattern of atmospheric mercury deposition in the Upper Midwest while global mercury deposition, represented by samples from Alaska, showed increases in deposition. The regional discrepancy is explained by the shift to cleaner fuels by the energy industry, long distance transport of pollutants and decrease in waste incineration.

Research and Development in the Physical, Engineering, and Life Sciences, Air Pollution Control, Air Pollution Control R&D, Research, Midwestern States, Pollution, Geology, Stratigraphic, Stratigraphy, Air pollution research, Pollution control research, Air quality

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Specific surface area of snow samples determine by CH(sub4) adsorption at 77 K and estimated by optical microscopy and scanning electron microscopy

Article Abstract:

Snow can adsorb atmospheric trace gases. Measuring snow's impact on atmospheric chemistry requires knowledge of the specific surface area of snow (SSA). The results of three methods for measuring or estimating the specific surface area of snow are compared: CH(sub4) adsorption at 77 K, optical microscopy, and scanning electron microscopy (SEM), used only on two samples). The results indicate that methane adsorption yields more reliable results.

France, Gases, Snow

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Elemental mercury in the atmosphere of a tropical Amazonian forest (French Guiana)

Article Abstract:

University researchers investigated the presence of gaseous mercury from an Amazonian forest in the French Guiana suggesting the gold mining at river basins may contribute to Hg's presence in the atmosphere.

Research and Testing Services, Scientific Research and Development Services, Research & Development-Universities, French Guiana, Amazon River region, University research

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