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Journal of Hazardous Materials

Journal of Hazardous Materials

IF: 12.19
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Chelation extraction of lead from soil using pyridine-2,6-dicarboxylic acid

Published:1 March 1995 DOI: 10.1016/0304-3894(94)00087-W
Edward Macauley, Andrew Hong

Abstract

Pyridine-2,6-dicarboxylic acid (PDA) was employed as a lead-complexing agent. Batch testing involving PDA extraction of lead from spiked soils showed PDA to be an effective lead solubilizing agent across a wide pH range. Lead extraction efficiency was independent of the total carbonate concentration, competing cations, or the soil aging period. In addition, PDA compared favorably with EDTA as a lead-complexing agent, while behaving more desirably than EDTA in releasing the extracted lead. PDA was effectively reclaimed and reused in four successive extraction procedures, achieving in each run a lead extraction efficiency that exceeded 80% recovery of the total lead present in the spiked soil. In recovery procedures, the complex solution was elevated to a pH of about 10, separating the lead as a hydroxide precipitate, and allowing for virtually complete recovery of the PDA in solution.

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