Characteristics of phosphorus fractionated from the sediment resuspension in
abrupt expansion flow experiments |
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Authors: | Jun Wan Ze Wang and Hezhong Yuan |
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Institution: | 1. College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China 2. College of Environmental Science and Engineering,Hohai University,Nanfing 210098,China 3. State Key Laboratory of Lake Sediments Process,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210098,China |
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Abstract: | Phosphorous (P) fraction characteristics in sediment resuspension were investigated under adequately hydrodynamic conditions.
Four forms of P in overlying water, including dissolved inorganic P, dissolved total P, total P, and particulate P, and six fractions of
P in suspended particulate matter (SPM), including loosely sorbed P (NH4Cl-P), redox-sensitive P (BD-P), aluminum-bound P (Al-
P), organic P (NaOH-nrP), calcium-bound P (Ca-P) and residual P (Res-P), were quantified, respectively. Di erent hydrodynamic
conditions resulted in di erent P form changes. Four states could be ascribed: (1) P desorption by sediment and SPM, and P adsorption
by overlying water; (2) P desorption by SPM, and P adsorption by overlying water; (3) P adsorption by SPM, and P desorption by
overlying water; and (4) P equilibrium between SPM and overlying water. The contents of P in overlying water acquired peak values
in the middle position of the vertical P distribution due to the combined actions of SPM and sediment. P fractions in SPM were in the
following order: BD-P > NaOH-nrp > Ca-P > Al-P > Res-P > NH4Cl-P. BD-P in SPM frequently exchanged with P forms in overlying
water. Resuspension was favorable to forming Ca-P in SPM. |
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Keywords: | phosphorus fractions hydrodynamic conditions suspended particulate matter abrupt expansion flow |
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