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Microalgae play a key function in aquatic ecosystems. Their development and growth are strongly regulated by trace metals as essential elements. However, trace metals could cause negative effects when exceeding certain concentrations in the environment. In this study we tested the development and growth rate of two freshwater microalgae, the cyanobacterium Pseudanabeana mucicola and the green alga Pediastrum duplex, from Vietnam over the period of 14 days exposing to chromium (Cr) at the concentrations up to 1,936 μg L. Besides, the Cr uptake and absorption by P. mucicola were evaluated over 7 days incubated in medium containing 422 μg Cr L. The results showed that Cr at the concentrations up to 1,078 μg L did not inhibit the development and growth rate of P. mucicola. Similarly, concentration of 224 μg Cr L had no adverse effects on growth of P. duplex. The cyanobacterium P. mucicola could make a reduction up to 71% of Cr in the test medium, hence become a distinguished candidate for metal phytoremediation. To the best of our knowledge this is the first investigation on the responses and absorption of Cr by freshwater microalgae from Vietnam.

Growth and metal uptake capacity of microalgae under exposure to chromium