Phosphorus speciation of sediments from lakes of different tropic status in Eastern China
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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 31P-nuclear magnetic resonance (31P-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 31P-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.
KeywordsPhosphorus Sediment 31P-NMR SMT Eutrophication
This work was supported by the National Natural Science Foundation of China (Grant No. 21507146) and the special fund from the State Key Joint Laboratory of Environment Simulation and Pollution Control (Research Center for Eco-environmental Sciences, Chinese Academy of Sciences) (15Z01ESPCR), and the Ministry of Science and Technology of China (2012BAJ21B04-01). We thank Dr. Jingxin Yang and Dr. Xiaogang Niu for 31P-NMR analysis (Beijing Nuclear Magnetic Resonance Center). We also thank Xuehong Kong, Shou Yuan, Bozhen Zhang, and Jianlin Bi for collecting the samples.
- Jin XC, Wang SR, Pang Y, Zhao HC, Zhou XN (2004) Negative sorption of phosphate on lake sediment. Ecol Environ 13:493–496Google Scholar
- Kraal P, Burton ED, Rose AL, Cheetham MD, Bush RT, Sullivan LA (2013) Decoupling between water column oxygenation and benthic phosphate dynamics in a shallow eutrophic estuary. Environ Sci Technol 47:3114–3121Google Scholar
- Psenner R, Puckso R (1988) Phosphorus fractionation: advantages and limits of the method for the study of sediments P origins and interactions. Arch Hydrobiol 30:43–59Google Scholar
- Zhang WQ, Shan BQ, Li J, Tang WZ, Jin X, Zhang H, Ding YK, Wang YY, Zhu XL (2015) Characteristics, distribution and ecological risk assessment of phosphorus in surface sediments from different ecosystems in Eastern China: a 31 P-nuclear magnetic resonance study. Ecol Eng 75:264–271CrossRefGoogle Scholar