Abstract
AbstractLeaching studies of contaminated soils were conducted to remove heavy metals, with the aim of recovering these species. Lead, copper and zinc were extracted using a leaching solution of HCl (0.1 M) and NaCl (1.9 M). Time‐dependent release was analyzed. A Langmuir‐type model fit well to the experimental data, allowing the determination of the maximum concentration of lead, copper and zinc that can be reached in the leaching solutions and the time required to attain a fixed leached concentration of metal. The influence of natural organic matter content of the soil on leaching time was evaluated. Natural organic matter content significantly influenced leaching time, due to metal complexation by dissolved organic matter transferred to the leaching solutions. Increasing of natural organic matter content of contaminated soils reduced leaching time.
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