Abstract
Lead is toxic to most living things at high exposure and there is no demonstrated biological need. The limit for lead in drinking water as set by US Public Health Service if 0.05 ppm. Previous reports have indicated that algae are not as sensitive to lead as many other organisms. Chelating agents, such as EDTA (Ethylene Diamine Tetraacetic Acid) are able to reduce the toxicity of lead and other metals. In natural habitats this may be due to the effect of reducing agents and amino acids. PH value has been reported to influence the effect of metals. Cobalt is a relatively rare metal produced primarily as a by-product of other metals, chiefly copper. It is used in high temperature alloys and in permanent magnets. Its salts are used in paint dryers as catalysts, and in the production of pigments. Cobalt has been shown to inhibit chlorophyll biosynthesis and the site inhibition by cobalt has been identified. In this study the effect of lead and cobalt on the growth of Anacystis nidulans will be studied.
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