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Zn and Cu isotopes as tracers of anthropogenic contamination in a sediment core from an urban lake

Environmental Science & Technology

By:
, , , , and
https://doi.org/10.1021/es902933y

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Abstract

In this work, we use stable Zn and Cu isotopes to identify the sources and timing of the deposition of these metals in a sediment core from Lake Ballinger near Seattle, Washington, USA. The base of the Lake Ballinger core predates settlement in the region, while the upper sections record the effects of atmospheric emissions from a nearby smelter and rapid urbanization of the watershed. δ66Zn and δ65Cu varied by 0.50‰ and 0.29‰, respectively, over the 500 year core record. Isotopic changes were correlated with the presmelter period (∼1450 to 1900 with δ66Zn = +0.39‰ ± 0.09‰ and δ65Cu = +0.77‰ ± 0.06‰), period of smelter operation (1900 to 1985 with δ66Zn = +0.14 ± 0.06‰ and δ65Cu = +0.94 ± 0.10‰), and postsmelting/stable urban land use period (post 1985 with δ66Zn = 0.00 ± 0.10‰ and δ65Cu = +0.82‰ ± 0.12‰). Rapid early urbanization during the post World War II era increased metal loading to the lake but did not significantly alter the δ66Zn and δ65Cu, suggesting that increased metal loads during this time were derived mainly from mobilization of historically contaminated soils. Urban sources of Cu and Zn were dominant since the smelter closed in the 1980s, and the δ66Zn measured in tire samples suggests tire wear is a likely source of Zn.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Zn and Cu isotopes as tracers of anthropogenic contamination in a sediment core from an urban lake
Series title:
Environmental Science & Technology
DOI:
10.1021/es902933y
Volume:
44
Issue:
5
Year Published:
2010
Language:
English
Publisher:
ACS Publications
Contributing office(s):
Texas Water Science Center
Description:
7 p.
First page:
1544
Last page:
1550
Country:
United States
State:
Washington
City:
Seattle
Other Geospatial:
Lake Ballinger