Isotopically constrained lead sources in fugitive dust from unsurfaced roads in the southeast Missouri mining district

Environmental Pollution
By: , and 

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Abstract

The isotopic composition of lead (Pb) in fugitive dust suspended by a vehicle from 13 unsurfaced roads in Missouri was measured to identify the source of Pb within an established long-term mining area. A three end-member model using 207Pb/206Pb and concentration as tracers resulted in fugitive dust samples plotting in the mixing field of well characterized heterogeneous end members. End members selected for this investigation include the 207Pb/206Pb for 1) a Pb-mixture representing mine tailings, 2) aerosol Pb-impacted soils within close proximity to the Buick secondary recycling smelter, and 3) an average of soils, rock cores and drill cuttings representing the background conditions. Aqua regia total concentrations and 207Pb/206Pb of mining area dust suggest that 35.4–84.3% of the source Pb in dust is associated with the mine tailings mixture, 9.1–52.7% is associated with the smelter mixture, and 0–21.6% is associated with background materials. Isotope ratios varied minimally within the operational phases of sequential extraction suggesting that mixing of all three Pb mixtures occurs throughout. Labile forms of Pb were attributed to all three end members. The extractable carbonate phase had as much as 96.6% of the total concentration associated with mine tailings, 51.8% associated with smelter deposition, and 34.2% with background. The next most labile geochemical phase (Fe + Mn Oxides) showed similar results with as much as 85.3% associated with mine tailings, 56.8% associated with smelter deposition, and 4.2% associated with the background soil.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Isotopically constrained lead sources in fugitive dust from unsurfaced roads in the southeast Missouri mining district
Series title Environmental Pollution
DOI 10.1016/j.envpol.2016.05.070
Volume 216
Year Published 2016
Language English
Publisher Elsevier
Contributing office(s) Center for Geospatial Information Science (CEGIS)
Description 10 p.
First page 450
Last page 459
Country United States
State Missouri
Online Only (Y/N) N
Additional Online Files (Y/N) N