ISSN:
1432-1009
Keywords:
Eutrophication
;
Copper sulfate
;
Aquatics
;
Bioassay
;
Algicide
;
Blue-green Algae Biogeochemical cycling
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract A new reservoir in southern California and a large eutrophic lake in northern California were the sites for an investigation of copper (Cu) in aquatic systems, with attention focused upon toxicity of Cu to algae. Results of bioassay experiments showed significant copper depression of chlorophyll a levels, photosynthesis, and nitrogen fixation at concentrations of 5–10μg//. Blue-green algae are especially susceptible to copper toxicity, primarily because of the inhibition of nitrogen fixation. Theoretical considerations show that Cu is likely to be strongly complexed in natural fresh waters, but not chemically precipitated. Field measurements following a Cu algicide treatment at the reservoir confirmed the expected stability of dissolved copper, showing elevated concentrations persisting for several weeks. Our present information about copper in aquatic systems permits descriptions of various pathways that eventually lead to the sediments. The algicidal effectiveness of copper is quite variable but it is likely to be greatest in lakes where nitrogen-fixing blue-green algae are abundant.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01866443
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