An investigation of lead chromate (crocoite-PbCrO4) and other inorganic pigments in aged traffic paint samples from Hamilton,Ohio: implications for lead in the environment |
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Authors: | Katherine White Teresa Detherage Maxwell Verellen Jennifer Tully Mark P S Krekeler |
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Institution: | 1. Department of Geology and Environmental Earth Science, Miami University-Hamilton, Hamilton, OH, 45011, USA 2. Department of Geology and Environmental Earth Science, Miami University, Oxford, OH, 45056, USA
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Abstract: | Traffic paint samples collected from roads in the City of Hamilton, Butler County, OH, USA were investigated to determine whether or not pigments are hazardous and are of environmental concern. Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) indicate that white and gray paint samples are dominated by calcite, rutile, anatase and quartz and blue traffic paint samples are dominated by calcite and barite. XRD and SEM indicate that most yellow traffic paints have lead chromate (crocoite-PbCrO4) with common particle sizes that are typically 125–350 nm in length and 75–200 nm in width. Larger aggregates of several micrometers in diameter are also observed. The solubility of PbCrO4 (1.34 × 10?7 mol/L at 25 °C) combined with an increase in solubility with exposure to 0.05–0.25 M NaCl and CaCl2 road treatments solutions as demonstrated by basic batch experiments likely makes PbCrO4 from traffic paint a potential source for lead pollution in surface water and groundwater that is not fully recognized. |
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