Characteristics of phosphorus fractionated from the sediment resuspension inabrupt expansion flow experiments
Jun Wan , Ze Wang , Hezhong Yuan
DOI:
Received November 30, 2009,Revised May 26, 2010, Accepted , Available online
Volume 22,2010,Pages 1519-1526
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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.
