Organic phosphorus species in surface sediments of a large,shallow, eutrophic lake,Lake Taihu,China |
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| Authors: | Xiuling Bai Shiming Ding Chengxin Fan Tao Liu Dan Shi Lu Zhang |
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| Institution: | 1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;2. College of life and environmental science, Hunan University of Arts and Science, Changde 415000, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Shanghai Water Source Construction Development Co., Ltd., Shanghai 200433, China;5. School of Resources and Environment, University of Jinan, Jinan 250022, China;6. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;1. State Key Laboratory of Environment Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;2. College of Water Sciences, Beijing Normal University, Beijing 100875, China;3. USDA-ARS Southern Regional Research Center, 1100 Robert E Lee Blvd, New Orleans, LA 70124, USA;4. Department of Biomedical Veterinary Biosciences and Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada;5. Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China;6. State Key Laboratory for Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong, China;1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;2. Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;3. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China |
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| Abstract: | Organic phosphorus (P) fractions in surface sediments from a large shallow, eutrophic Lake Taihu, China, were extracted with 0.1 M NaOH after pre-treatment of the sediments with a solution composed of 0.1 M EDTA and 2% (w/v) Na2S2O4. Composition of organic P in the extracts was then characterized by 31P nuclear magnetic resonance spectroscopy (31P NMR). Several P species, including phosphonates, orthophosphate, orthophosphate monoesters, phospholipids, DNA, pyrophosphate and polyphosphate, were detected in the NaOH extracts. The proportion of extracted organic P to total P in sediments was negatively correlated with total P in the water column, as were the proportions for orthophosphate monoesters and DNA. This implies that the majority of organic P in surface sediments is likely stabilized in some way, and does not directly contribute to the internal loading of P from sediments. |
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