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Historical sediment mercury deposition trends for South Dakota lakes

Journal of Paleolimnology

By:
https://doi.org/10.1007/s11368-018-2014-3

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Abstract

Purpose

Select South Dakota, USA water bodies, including both natural lakes and man-made impoundments, were sampled and analyzed to assess mercury (Hg) dynamics and historical patterns of total Hg deposition.

Materials and methods

Sediment cores were collected from seven South Dakota lakes. Mercury concentrations and flux profiles were determined using lead (210Pb) dating and sedimentation rates.

Results and discussion

Most upper lake sediments contained variable heavy metal concentrations, but became more consistent with depth and age. Five of the seven lakes exhibited Hg accumulation fluxes that peaked between 1920 and 1960, while the remaining two lakes exhibited recent (1995–2009) Hg flux spikes. Historical sediment accumulation rates and Hg flux profiles demonstrate similar peak and stabilized values. Mercury in the sampled South Dakota lakes appears to emanate from watershed transport due to erosion from agricultural land use common to the Northern Great Plains.

Conclusions

For sampled South Dakota lakes, watershed inputs are more significant sources of Hg than atmospheric deposition.

Study Area

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Historical sediment mercury deposition trends for South Dakota lakes
Series title:
Journal of Paleolimnology
DOI:
10.1007/s11368-018-2014-3
Edition:
Online first
Year Published:
2018
Language:
English
Publisher:
Springer
Contributing office(s):
Coop Res Unit Leetown
Country:
United States
State:
South Dakota