Date of Award

5-9-2015

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Geosciences

First Advisor

Daniel M. Deocampo

Second Advisor

Nadine Kabengi

Third Advisor

Dajun Dai

Fourth Advisor

Robert Simmons

Abstract

In summer of 2012, dust and processed ore were collected from ~54 villages by U.S. CDC and Nigerian colleagues after the discovery of widespread lead poisoning in northwest Nigeria, and provided to the Environmental Research Laboratory at GSU. Various geochemical analyses were conducted to assess the magnitude of Pb exposure. ICP-AES determined Pb concentrations as high as 61,000 ppm. SEM-EDS and XRD analyses of high concentration samples (>400 ppm) revealed the presence of gold, galena, and cerussite. XRD Cluster Analysis revealed one outlier and 3 clusters. Samples with Pb>400ppm Pb had a strong correlation between Pb and S. GIS Kriging maps illustrate geochemical spatial distribution. Carbonate combustion analysis found TIC has a negative correlation to Pb. Approximately 3% of samples contained >400ppm of Pb (U.S. EPA RSSL). Discovery of galena (PbS) and it’s secondary weathering product cerussite (PbCO3), a highly bioavailable Pb-bearing phase, were discovered in these high Pb samples, indicating a continuing threat to human health.

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