Assessing the Quality of Natural Waters in Magnesia Prefecture in Greece using Toxkits
Abstract : In this study, the results of water quality analyses in the reservoir of the former Lake Karla in Magnesia prefecture in Greece are presented. Physical, chemical and ecotoxicological parameters were examined, the latter by application of 2 Toxkit microbiotests with crustaceans (Daphnia magna) and micro-algae (Selenastrum capricornutum). According to the classification criteria used for assessing the suitability of water for irrigation purposes, the reservoir water quality was poor in terms of electrical conductivity and good in terms of boron concentration. Mortality of D. magna in reservoir waters was generally low, with occasional peaks of up to 30%. The results of the Algaltoxkit FTM test appeared to indicate that the water was not suited for irrigation purposes since the growth of S. capricornutum, using natural water as the test medium was less than 20% of that in the controls. Addition of nutrients did, however, result in markedly better growth.
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