Arsenic,antimony and selenium speciation during a spring phytoplankton bloom in a closed experimental ecosystem |
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| Institution: | 1. Federal Institute of Technology of Pernambuco, Av. Prof Luiz Freire, 500, CEP: 50740-540, Recife, PE, Brazil;2. Federal University of Pernambuco, Av. Prof. Moraes Rego, 123, CEP 50670-901, Recife, PE, Brazil;3. Federal University of Paraiba, cidade universitaria, s/n, CEP: 58051-900, João Pessoa, PB, Brazil;1. School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China;2. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States;3. Department of Oceanography, Texas A&M University, College Station, TX 77843, United States;4. Department of Marine and Coastal Sciences and Department of Earth and Planetary Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901, United States;1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2. School of Resources and Environment, University of Jinan, Jinan 250022, China;3. Nanjing University of Science and Technology, 200 Xiaolingwei Road, 210094 Nanjing, China;4. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;5. Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai 200120, China;6. Nanjing EasySensor Environmental Technology Co., Ltd, Nanjing 210018, China;1. University of Denver, Department of Biology, USA;2. Denver Botanic Gardens, Department of Research and Conservation, USA;1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, PR China;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, PR China;3. University of Chinese Academy of Sciences, Beijing, 100049, PR China |
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| Abstract: | A study has been made of the effects of a spring diatom bloom on the levels and speciation of dissolved arsenic, antimony and selenium in the water enclosed in an experimental ecosystem moored in Loch Ewe (NW Scotland). Primary productivity resulted in severe depletion of phosphate and silicate in the bag, but had little effect on the levels and speciation of arsenic and antimony. Calculations based on phosphate depletion data strongly suggest that the field diatom population present during the experiment was capable of some degree of discrimination between phosphate and arsenate ions. Whilst biomethylation of arsenic was not observed in the upper region of the bag, where the phytoplankton population was at its greatest, the methylated form accounted for 64% of the dissolved arsenic at the base of the bag. In this region, however, the total dissolved arsenic levels were not higher than in the rest of the bag, suggesting microbial methylation of dissolved arsenic rather than the release of methylated arsenic from decaying phytoplankton.Total dissolved selenium and selenium(IV) showed some evidence of depletion during the development of the phytoplankton bloom, in support of previous observations of preferential selenite assimilation. |
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