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As an important phosphorus (P) source in water, sediment P release can influence water quality in the tributary backwater zone of "river-type" reservoir. Chemical sequential extraction and diffusive gradients in thin films technique (DGT) were applied to study sediment P mobility in the Daning River backwater zone (DNB) in the Three Gorges Reservoir (TGR). Influenced by the TGR backwater intrusion, both of water P forms and sediment P forms in the DNB zone exhibited increased spatial distributions from upper reach to lower reach. Sediment particles in the upper, middle, lower reaches were mainly derived from the settled particles (with high Ca contents) carried by the Daning River outflow, the former and sedimentary dead algal, the settled particles carried by the TGR backwater, respectively. According to P adsorption/desorption experiment results and concentration gradients of DGT-labile P at the sediment-overlying interface (SWI), sediments in the DNB zone acted as P source for overlying water during the sampling period. In the lower reach of the DNB zone and the adjacent TGR mainstream, iron oxides reduction in the anoxic or anaerobic sediments drove the synchronous release of labile P and Fe(II). Whereas, algal decomposition directly produced labile P and S(-II) in the top 0 to -10 mm sediment layer in the middle reach, and then the downward increases of labile P and Fe(II) in the depth of -30 to -80 mm were caused by iron oxides reduction. In the upper reach, the released labile P in sediments might be re-trapped by precipitating with Ca(II) or being adsorbed onto the newly formed iron oxides near the SWI. Sediment P release in DNB zone had a limited influence on water quality, but the influence would be significant in the future time after the external P source is reduced efficiently.
This article was published in the following journal.
Name: The Science of the total environment
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Stable phosphorus atoms that have the same atomic number as the element phosphorus, but differ in atomic weight. P-31 is a stable phosphorus isotope.
Phosphorus used in foods or obtained from food. This element is a major intracellular component which plays an important role in many biochemical pathways relating to normal physiological functions. High concentrations of dietary phosphorus can cause nephrocalcinosis which is associated with impaired kidney function. Low concentrations of dietary phosphorus cause an increase in calcitriol in the blood and osteoporosis.
Unstable isotopes of phosphorus that decay or disintegrate emitting radiation. P atoms with atomic weights 28-34 except 31 are radioactive phosphorus isotopes.
Inorganic compounds that contain phosphorus as an integral part of the molecule.
Disorders in the processing of phosphorus in the body: its absorption, transport, storage, and utilization.