Sources and Sinks of Lead and Other Trace Metals Enriched in the Surface Sediments of Remote Subalpine Lakes in Taiwan

Abstract

Sediment cores were collected from two remote subalphine lakes: the rather shallow (1.5m) Little Ghost Lake at 2040 , elevation and the deep Great Ghost Lake (35m) at 2150 m elevation. The distributions of metal/Al (in bulk samples) and acid-leached metal in the sediments of the Little Ghost Lake suggest that the surface enrichments of Cd and Pb (probably also Cr and Zn) are caused mainly by anthropogenic inputs. The distributions of leached Pb and Pb-206/Pb-207 ratios indicate a large anthropogenic input since about 1940, as based on Pb-210 and C-14 dating.

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