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Sediment Mercury Profile, Laguna de Pozuelos, Argentine Northwest


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Conaway, C.H., McGlue, M.M., Cohen, A.S., and Swarzenski, P.W., 2020, Sediment Mercury Profile, Laguna de Pozuelos, Argentine Northwest: U.S. Geological Survey data release,


The data represent a shallow mercury chronology using sediment core from a playa lake system situated in a high-altitude setting in northwest Argentina. Archive samples were used from sediment core (LP07-1A) that was collected from a location (lat -22.362100°, lon -66.003600°) in the center of the playa-lake Laguna de Pozuelos in the dry season of 2007, when the water level was 2 to 3 cm. The samples were taken over 1 to 2 cm intervals and had been dried and homogenized. Sediment total mercury analyses were conducted by digesting sediment (0.30 g) in boiling concentrated nitric/sulfuric acid (ratio 3:1), followed by 12 hour oxidation with bromine monochloride, tin chloride reduction, gold amalgamation, and detection by CVAFS. Additional [...]


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Data were obtained in order to assess regional and global mercury atmospheric deposition trends. Atmospheric deposition of mercury in the Southern Hemisphere is not well characterized because chronologies from that region are far fewer than in the Northern Hemisphere. Thus an existing environmental archive--a sediment core from high-altitude lake in Argentina--was used to investigate mercury chronology in high-altitude Southern Hemisphere basin.
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DOI doi:10.5066/P91I9H52

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