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This paper describes an investigation which was carried out to establish the reasons for the apparent poor toxicity of copper sulphate to the odor producing cyanobacterium Anabaena circinalis in a water supply reservoir in Australia (Happy Valley Reservoir, South Australia) in 2000/2001. Several alternative explanations are possible for the ineffectiveness of recent copper treatments of Happy Valley Reservoir: the strain of Anabaena circinalis in Happy Valley Reservoir has high resistance to copper; unusual water chemistry conditions in Happy Valley Reservoir in 2000/2001 have led to significant complexation of copper and reduced toxicity; and,application of copper sulphate under well-mixed conditions (ie windy conditions), whichwhen combined with rapid complexation of copper may result in the cells of Anabaena circinalis not being exposed to an adequate toxic dose of copper. Either one, or a combination of these conditions, could lead to reduced effectiveness of copper sulphate application for algal control. The investigations reported here pursued the first two hypotheses by examining copper toxicity under laboratory conditions, and examining some aspects of the copper chemistry and bio-availability in the reservoir water, also in the laboratory. Includes 20 references.

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Edition: Vol. - No. Published: 11/01/2002 Number of Pages: 6File Size: 1 file , 260 KB