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首页> 外文期刊>Environmental Science & Technology: ES&T >Use of 87{sup left}Sr/86{sup left}Sr and δ11{sup left}B To Identify Slag-Affected Sediment in Southern Lake Michigan
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Use of 87{sup left}Sr/86{sup left}Sr and δ11{sup left}B To Identify Slag-Affected Sediment in Southern Lake Michigan

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摘要

Slag is a ubiquitous byproduct of the iron-smelting industry and influences geochemistry and water quality in adjacent geologic units, ground and surface water. Despite extensive slag deposition along the Indiana shoreline of Lake Michigan, definitive evidence that slag has affected lakebed sediments has not been established. Concerns for the protection of water and ecosystem resources in the Great Lakes motivated this study to determine if strontium and boron isotopes could be used to identify and delineate slag-affected bed sediment in Lake Michigan. Sixty-five samples of bed sediment were acquired from the southern lobe of Lake Michigan and analyzed for 87{sup left}Sr/86{sup left}Sr and δ11{sup left}B. Samples immediately offshore from Indiana steel mills and slag-disposal sites contained higher median 87{sup left}Sr/86{sup left}Sr values (0.70881) than shoreline sediments collected elsewhere in the basin (0.70847) and uniquely decreased with increasing distance from the shoreline. The highest δ11{sup left}B values occurred in sediments from the Indiana shoreline (+12.9 to 16.4‰) but were also elevated in sediments collected offshore from three Lake Michigan cities (+11.7 to 12.7‰). Contoured isotope data indicated that 82-154 km{sup}2 of bed sediment along the Indiana shoreline had elevated 87{sup left}Sr/{sup left}86Sr and δ11{sup left}B values relative to shoreline sediments elsewhere in southern Lake Michigan.

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