title: Phosphorus speciation of sediments from lakes of different tropic status in Eastern China.
abstract: Information about the chemical composition of phosphorus (P) in sediment is critical for understanding P dynamics and eutrophication in lake ecosystems. Eutrophication as a result of P pollution still persists so we chose to determine the P characteristics of sediments from ten lakes of different trophic status and the relationships between P fractions and environmental factors. The results show that the Standards, Measurements and Testing (SMT) method combined with (31)P-nuclear magnetic resonance ((31)P-NMR) can efficiently show the P characteristics of sediment. Phosphorus concentrations in sediments decreased as the trophic status of the lake improved. Inorganic P (Pi) was the dominant form of total P (TP) in most of the lake sediments and was mainly comprised of HCl-Pi, a stable Pi fraction. Results of (31)P-NMR analysis show that the extracts were dominated by ortho-P (36.4-94.8%) and mono-P (4.0-36.2%), with smaller amounts of diester-P (.6-23.1%), pyro-P (.2-4.4%), and phon-P (.3-.7%). Analysis of the relationships between the P composition and the trophic status of the lakes indicated that the bioavailability of P forms has an influence on the surface water trophic conditions and the health of aquatic ecosystems.
authors.affiliation: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P. O. Box 2871, Beijing, 100085, People's Republic of China.
authors.forename: Wenqiang
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P. O. Box 2871, Beijing, 100085, People's Republic of China.|University of Chinese Academy of Science, Beijing, 100049, People's Republic of China.
authors.forename: Nan
authors.initials: N
authors.lastname: Rong
authors.affiliation: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P. O. Box 2871, Beijing, 100085, People's Republic of China.|University of Chinese Academy of Science, Beijing, 100049, People's Republic of China.
authors.forename: Xin
authors.initials: X
authors.lastname: Jin
authors.affiliation: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P. O. Box 2871, Beijing, 100085, People's Republic of China.|University of Chinese Academy of Science, Beijing, 100049, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P. O. Box 2871, Beijing, 100085, People's Republic of China.|University of Chinese Academy of Science, Beijing, 100049, People's Republic of China.
authors.forename: Yuekui
authors.initials: Y
authors.lastname: Ding
authors.affiliation: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P. O. Box 2871, Beijing, 100085, People's Republic of China.|University of Chinese Academy of Science, Beijing, 100049, People's Republic of China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Zhu
authors.affiliation: State Key Laboratory on Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Science, P. O. Box 2871, Beijing, 100085, People's Republic of China. bqshan@rcees.ac.cn.
authors.forename: Baoqing
authors.initials: B
authors.lastname: Shan
mesh_terms: D002681:China; D017753:Ecosystem; D005068:Eutrophication; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D010758:Phosphorus / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: 31P-NMR; Eutrophication; Phosphorus; SMT; Sediment