Abstract
Sediment phosphorus (P) fractions and sorption characteristics and P release from intact sediment cores of Baiyangdian Lake in North China in spring 2009 were investigated. Results of chemical fractionation showed that total P (TP) content in sediment ranged from 443 to 611 mg kg − 1. Of the P fractions including inorganic P (IP) and organic P (OP), IP was a dominant component of TP and present in the form of P bounded to calcium (Ca–P) while the bioavailable P content bounded to Al, Fe, and Mn oxides and hydroxides (Fe/Al–P) varied from 14 to 102 mg kg − 1. The batch experiments showed that the sediments had appreciable maximum P adsorption capacity from 141.86 to 377.37 mg kg − 1. However, the zero P equilibrium concentration (C\(_{{\rm eq}}^{0})\) in most sampling sites was larger than the P concentration in water column. Accordingly, the sediments from those sampling sites would release P into the overlying water at the positive P flux rates as a P release source. Significant positive correlation between P flux rates and Fe/Al–P revealed that the sediment P release would mainly originate from the bioavailable P fraction. It is evident that the inherent phosphorus present in lake sediments would be a major threat to the water quality and ecosystem reservation in Baiyangdian lake.
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Dong, L., Yang, Z. & Liu, X. Phosphorus fractions, sorption characteristics, and its release in the sediments of Baiyangdian Lake, China. Environ Monit Assess 179, 335–345 (2011). https://doi.org/10.1007/s10661-010-1740-9
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DOI: https://doi.org/10.1007/s10661-010-1740-9