Abstract
A soil column experiment was carried out to investigate the effects of inoculation of bacteria on metal bioavailability, mobility and potential leachability through single chemical extraction, consequential extraction and in situ soil solution extraction technologies. Results showed that bacteria inoculated, including Azotobacter chroococcum, Bacillus megaterium and Bacillus mucilaginosus, may pose both positive and negative impacts on bioavailability and mobility of heavy metals in soil, depending on the chemical nature of the metals. The activities of bacteria led to an increase of water dissolved organic carbon (DOC) concentration and a decrease of pH value, which enhanced metal mobility and bioavailability (e.g. an increase of water-soluble and HOAc-soluble Zn). On the other hand, bacteria could immobilize metals (e.g. a great reduction of water-soluble Pb) due to the adsorption by bacterial cell walls and possible sedimentation reactions with phosphate or other anions produced through bacterial metabolism.
| Original language | English |
|---|---|
| Pages (from-to) | 765-773 |
| Number of pages | 9 |
| Journal | Environmental Pollution |
| Volume | 144 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Dec 2006 |
Scopus Subject Areas
- Toxicology
- Pollution
- Health, Toxicology and Mutagenesis
User-Defined Keywords
- Bacterial inoculation
- Metal bioavailability
- Metal mobility
- Metal speciation
- Soil column