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), which
when 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.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 260 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 6 |
| Published : | 11/01/2002 |
