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Environmental Engineering Research 2004;9(6): 299-307. DOI: https://doi.org/10.4491/eer.2004.9.6.299
ELECTRON PROBE MICROANALYSIS (EPMA) INVESTIGATION OF LEAD LOCATION ON THE SOLIDIFICATION/STABILIZATION OF PB WASTES
Dongjin Lee
School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
Corresponding Author: Dongjin Lee ,Tel: +61-2-9385-5562, Fax: +61-2-9385-6139, Email: dongj7@empal.com
Received: September 1, 2004;  Accepted: January 16, 2005.
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ABSTRACT
The location of lead on the solidified waste forms (SWF) has been investigated by electron probe microanalysis (EPMA) which provides quantitative and qualitative insight into the nature of the surface and bulk chemistry. The effect of calcite is observed to be associated with an enhancement in migration of the major cement components of calcium, silicate, sulfate and aluminate ions farther from the cement grain boundaries. Large lead precipitates of about 200-500 ism are found in the cavity and broad inter-particle areas of lead-rich SWF. The elemental composition of the lead precipitates would consist of lead with high sulfur. However calcite addition leads to preferential deposition of lead at specific locations of higher intensity of calcium, silicon and sulfur in the inter-particle areas.
Keywords: Calcite | Lead | EPMA | Solidified Waste Forms (SWF)
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