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- Title
Phosphorus fractions, sorption characteristics, and its release in the sediments of Baiyangdian Lake, China.
- Authors
Liming Dong; Zhifeng Yang; Xinhui Liu
- 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. 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. The batch experiments showed that the sediments had appreciable maximum P adsorption capacity from 141.86 to 377.37 mg kg. 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.
- Subjects
HEBEI Sheng (China); CHINA; PHOSPHORUS; ADSORPTION (Chemistry); SEDIMENTS; PHYTOPLANKTON; LAKES
- Publication
Environmental Monitoring & Assessment, 2011, Vol 179, Issue 1-4, p335
- ISSN
0167-6369
- Publication type
Article
- DOI
10.1007/s10661-010-1740-9