Effects of water quality parameters on boron toxicity to Ceriodaphnia dubia
| Autor: | Christian E. Schlekat, William A. Stubblefield, Gail M. Dethloff |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Health
Toxicology and Mutagenesis Alkalinity chemistry.chemical_element Fresh Water Toxicology Chloride Calcium Carbonate Chlorides Dissolved organic carbon Toxicity Tests medicine Animals Boron biology Sodium Ceriodaphnia dubia General Medicine Hydrogen-Ion Concentration biology.organism_classification Cladocera Pollution Acute toxicity Carbon Trace Elements chemistry Environmental chemistry Toxicity Water quality medicine.drug Environmental Monitoring |
| Zdroj: | Archives of environmental contamination and toxicology. 57(1) |
| ISSN: | 1432-0703 |
| Popis: | The potential modifying effects of certain water quality parameters (e.g., hardness, alkalinity, pH) on the acute toxicity of boron were tested using a freshwater cladoceran, Ceriodaphnia dubia. By comparison, boron acute toxicity was less affected by water quality characteristics than some metals (e.g., copper and silver). Increases in alkalinity over the range tested did not alter toxicity. Increases in water hardness appeared to have an effect with very hard waters (500 mg/L as CaCO(3)). Decreased pH had a limited influence on boron acute toxicity in laboratory waters. Increasing chloride concentration did not provide a protective effect. Boron acute toxicity was unaffected by sodium concentrations. Median acute lethal concentrations (LC(50)) in natural water samples collected from three field sites were all greater than in reconstituted laboratory waters that matched natural waters in all respects except for dissolved organic carbon. Water effect ratios in these waters ranged from 1.4 to 1.8. In subsequent studies using a commercially available source of natural organic matter, acute toxicity decreased with increased dissolved organic carbon, suggesting, along with the natural water studies, that dissolved organic carbon should be considered further as a modifier of boron toxicity in natural waters where it exceeds 2 mg/L. |
| Databáze: | OpenAIRE |
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