Back to Search
Start Over
Natural DOM Affects Copper Speciation and Bioavailability to Bacteria and Ciliate
- Source :
- Archives of Environmental Contamination and Toxicology. 57:274-281
- Publication Year :
- 2008
- Publisher :
- Springer Science and Business Media LLC, 2008.
-
Abstract
- This study aimed to investigate the influence of natural dissolved organic materials (DOM) on copper speciation (total dissolved, particulate, and free Cu2+ ions) and bioavailability during a two-level experimental microbial food chain. Bacteria were used as the first trophic level, and Paramecium caudatum (protozoan) as the second. The organisms were obtained from a freshwater reservoir and kept under controlled laboratory conditions. Three experimental treatments were performed: exposure of the organisms to copper in the absence of DOM, exposure to DOM in the absence of copper, and exposure to both copper and DOM. Freshwater medium containing natural DOM and copper at a total dissolved concentration of 1.8 x 10(-6) mol L(-1) was furnished to bacteria, which was further used as food to the protozoan. The results showed that after bacterial growth, DOM concentration decreased as quantified by total organic carbon determinations. At the same time, free Cu2+ ions concentration increased in the medium. A lower copper concentration was detected in both microorganisms in the presence of DOM. We conclude that natural DOM reduced copper accumulation in the organisms on the first and second trophic levels, thus reducing the entrance of copper into the aquatic microbial food chain.
- Subjects :
- Food Chain
Health, Toxicology and Mutagenesis
media_common.quotation_subject
Microorganism
chemistry.chemical_element
Biology
Toxicology
Food chain
Dissolved organic carbon
Animals
Ecotoxicology
Paramecium caudatum
Organic Chemicals
media_common
Trophic level
Bacteria
Spectrophotometry, Atomic
General Medicine
Pollution
Copper
Bioavailability
Kinetics
Speciation
chemistry
Environmental chemistry
Calibration
Particulate Matter
Subjects
Details
- ISSN :
- 14320703 and 00904341
- Volume :
- 57
- Database :
- OpenAIRE
- Journal :
- Archives of Environmental Contamination and Toxicology
- Accession number :
- edsair.doi.dedup.....8aea87d51fcf94ce00e62c06435057c8