Abstract

SummaryIn many former experiments we found a good suitability of Cladophoraceae as test organisms for water quality. The most important arguments are: the dependence of the algal yield by the end of an experiment on several factors which are connected with the eutrophication, such as nutrient salt concentration, extracellular products of bacteria, thiamine concentration and the sensibility to several heavy metals (chapter B). Growth experiments were made with axenic cultures of Cladophora (only Zn, Cu experiments) and Rhizoclonium (Zn, Cu, Pb and Cd experiments) to detect effects of heavy metals. We could determine the following toxic concentrations (added at the beginning of the experiments) for zinc, copper (chapter C), lead (chapter D2a) and cadmium (chapter D3): zinc 0.1 mg/l; copper 0.05 mg/l; lead 1.2 mg/l; cadmium 0.01 mg/l. The estimation of effects of the actual lead concentration on the growth of Rhizoclonium showed (chapter D2b) that only 50–80 per cent are available for the algae (culture solution: 100 ml brook-water; vessels: Erlenmeyer-flasks of 300 ml content); the rest is eliminated by precipitation or adsorption effects. The maximum concentration factor of lead in the yield of Rhizoclonium experiments is 10,000 (chapter D2c). The quantity which is taken up by algae depends linearly on the added lead concentration (Table 1).

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