Sorption of lead by phlogopite-rich mine tailings
| Autor: | Salla H. Venäläinen |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
010504 meteorology & atmospheric sciences
Soil test Environmental remediation 010501 environmental sciences engineering.material complex mixtures 01 natural sciences Apatite chemistry.chemical_compound Mining engineering Geochemistry and Petrology Environmental Chemistry 0105 earth and related environmental sciences Calcite Aqueous solution Sorption Pollution Tailings 6. Clean water chemistry 13. Climate action visual_art Environmental chemistry engineering visual_art.visual_art_medium Phlogopite Geology |
| Zdroj: | Applied Geochemistry. 27:1593-1599 |
| ISSN: | 0883-2927 |
| DOI: | 10.1016/j.apgeochem.2012.05.011 |
| Popis: | The Pb sorption capacity of apatite ore mine tailings and its potential to act as a remediation agent in a Pb polluted areas were investigated. The tailings, originating from the Siilinjarvi carbonatite complex in Finland, consist mainly of phlogopite and calcite accompanied by apatite residues. The ability of the tailings to retain Pb from an aqueous solution was investigated using an isotherm technique. Furthermore, in a 3-month incubation experiment, uncontaminated mineral soil was amended with untreated tailings and with tailings artificially weathered with acid to increase the quantity of Al and Fe (hydr)oxides. Tailings of two particle-sizes (∅ > 0.2 mm and ∅ < 0.2 mm) somewhat differing in their mineralogical composition were investigated as separate amendments. All tailings materials were added to the soil in two dosages (5 g and 10 g of tailings per 125 g of soil). Following incubation, tailings-induced changes in the Pb sorption capacity of the soil were investigated with the isotherm technique. Finally, to investigate the distribution of sorbed Pb among various chemical pools, the soil samples amended with tailings were contaminated with Pb and then subjected to sequential fractionation analysis. The results revealed efficient removal of Pb from an aqueous solution by the tailings, presumably through precipitation and surface complexation mechanisms. Amending the soil with the tailings increased the mass-based maximum Pb sorption capacity from 10.8 mg kg−1 of the control soil to 14–20.5 mg kg−1 for the untreated tailings and to 32.1–72.1 mg kg−1 for the acid-treated material. The tailings transferred Pb from the exchangeable pool to the non-extracted one and thereby substantially decreased its bioavailability. The material with a particle diameter of less than 0.2 mm had a higher mass-based Pb sorption capacity than the large-sized material. The results suggest that the tailings may potentially serve as an immobilizing agent in polluted areas. |
| Databáze: | OpenAIRE |
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