Solubilization of Pb-bearing apatite Pb5(PO4)3Cl by bacteria isolated from polluted environment
| Autor: | Tomasz Bajda, Aleksandra Sklodowska, Łukasz Drewniak, Maciej Manecki |
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| Rok vydání: | 2017 |
| Předmět: |
Siderophore
Environmental Engineering Health Toxicology and Mutagenesis Microorganism 010501 environmental sciences engineering.material Bacterial growth 01 natural sciences Apatite Pyromorphite chemistry.chemical_compound Environmental Chemistry 0105 earth and related environmental sciences biology Chemistry Pseudomonas Public Health Environmental and Occupational Health Environmental engineering 04 agricultural and veterinary sciences General Medicine General Chemistry biology.organism_classification Phosphate Pollution visual_art Environmental chemistry 040103 agronomy & agriculture engineering visual_art.visual_art_medium 0401 agriculture forestry and fisheries Bacteria |
| Zdroj: | Chemosphere. 171:302-307 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2016.12.056 |
| Popis: | The main purpose of this study was to test if microorganisms isolated from heavily polluted environments can enhance dissolution of Pb-apatite (pyromorphite) resulting in remobilization of lead. Three bacterial strains belonging to the genus Pseudomonas isolated from underground mines in SW Poland were used in batch experiments of pyromorphite solubilization carried out in phosphate reach and phosphate poor media. Bacteria growth and evolution of Pb and phosphate concentrations as well as pH were determined. Additionally the concentration of bacterial siderophores in leaching solution was assayed. All bacterial strains were able to grow in both media in the presence of pyromorphite. The number of bacterial cells was from one to two orders of magnitude higher in the phosphate rich media. In the phosphate poor media the only source of P was the dissolving lead apatite. Bacteria enhanced the solubility of pyromorphite resulting in elevated Pb concentrations, up to 853 μg L −1 in phosphate-rich medium and 6112 μg L −1 in phosphate-poor medium, compared to less than 100 μg L −1 in an abiotic control sample. Production of siderophores was characteristic for each culture and was much lower (10–1000 fold) in the phosphate-poor medium. This study demonstrates for the first time that indigenous bacteria can directly and indirectly promote the mobilization of lead from pyromorphite. This phenomenon should be considered in long term risk assessment of Pb contaminated soils after reclamation processes because bacteria can play a significant role in the efficiency of clean-up efforts and overall geochemical cycling of Pb. |
| Databáze: | OpenAIRE |
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