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| Titel |
Phosphorus sorption and buffering mechanisms in suspended sediments from the Yangtze Estuary and Hangzhou Bay, China |
| VerfasserIn |
M. Li, M. J. Whelan, G. Q. Wang, S. M. White |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 5 ; Nr. 10, no. 5 (2013-05-17), S.3341-3348 |
| Datensatznummer |
250018254
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| Publikation (Nr.) |
 copernicus.org/bg-10-3341-2013.pdf |
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| Zusammenfassung |
| The adsorption isotherm and the mechanism of the buffering effect are
important controls on phosphorus (P) behaviors in estuaries and are important for
estimating phosphate concentrations in aquatic environments. In this paper,
we derive phosphate adsorption isotherms in order to investigate sediment
adsorption and buffering capacity for phosphorus discharged from sewage
outfalls in the Yangtze Estuary and Hangzhou Bay near Shanghai, China.
Experiments were also carried out at different temperatures in order to
explore the buffering effects for phosphate. The results show that P sorption
in sediments with low fine particle fractions was best described using
exponential equations. Some P interactions between water and sediment may be
caused by the precipitation of CaHPO4 from Ca2+ and HPO42−
when the phosphate concentration in the liquid phase is high. Results from
the buffering experiments suggest that the Zero Equilibrium Phosphate
Concentrations (EPC0) vary from 0.014 mg L−1 to
0.061 mg L−1, which are consistent with measured phosphate
concentrations in water samples collected at the same time as sediment
sampling. Values of EPC0 and linear sorption coefficients (K) in
sediments with high fine particle and organic matter contents are relatively
high, which implies that they have high buffering capacity. Both EPC0
and K increase with increasing temperature, indicating a higher P buffering
capacity at high temperatures. |
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