Combined effects of dissolved organic material and water hardness on toxicity of cadmium to Daphnia magna
Journal Article
·
· Environmental Toxicology and Chemistry
- Univ. of Joensuu (Finland)
The interaction between dissolved organic material (DOM) and water hardness and their effects on the acute toxicity of cadmium (Cd) to Daphnia magna was studied. At an original hardness of humic lake water, Cd was significantly less toxic in the humic than in the reference water. Furthermore, after dilution down to 10%, the humic water still decreased the lethality significantly. The results suggest that the reduced toxicity of Cd in the lake water is due to complexation with DOC. An increase in water hardness decreased the measured binding coefficient of Cd to DOM. In addition, the acute toxicity of Cd decreased, and the difference between the reference and humic water disappeared. As a conclusion, DOM in the soft lake water had a protective effect against Cd toxicity. In hard water, obviously, the added hardness cations, especially Ca{sup 2+}, effectively competed with Cd{sup 2+} for available binding sites in DOM. Simultaneously, CA{sup 2+} ions interfered also with the uptake of Cd{sup 2+} either by competing in transport through cell membranes or by reducing membrane permeability.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 305463
- Journal Information:
- Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 12 Vol. 17; ISSN ETOCDK; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
Similar Records
Toxic effect of selenium on the zooplankton, Daphnia magna and Daphnia pulicaria, in water and the food source (Chlamydomonas reinhardtii)
A comparison of the toxicity of 30 reference chemicals to Daphnia magna and Daphnia pulex
Chronic toxicity of aniline and 2,4-dichlorophenol to Daphnia magna Straus
Thesis/Dissertation
·
Sat Dec 31 23:00:00 EST 1983
·
OSTI ID:5216628
A comparison of the toxicity of 30 reference chemicals to Daphnia magna and Daphnia pulex
Journal Article
·
Thu Nov 30 23:00:00 EST 1995
· Environmental Toxicology and Chemistry
·
OSTI ID:162954
Chronic toxicity of aniline and 2,4-dichlorophenol to Daphnia magna Straus
Journal Article
·
Thu Dec 31 23:00:00 EST 1987
· Bull. Environ. Contam. Toxicol.; (United States)
·
OSTI ID:5348375