ADSORPTION OF PHOSPHATE ON TIDAL FLAT SURFACE SEDIMENTS FROM THE YANGTZE ESTUARY

摘要

Kinetic simulation for phosphorus adsorption by sediments has shown that fast phosphorus adsorption mainly occurred at the beginning of experiment from 0-10h and then basically attending to a dynamic equilibrium after 10h. The phosphorus adsorption rates at different time intervals exhibit that phosphate adsorption by sediments occurred in 0-0.5h, and were obviously influenced by fine particle concentrations. The experimental results show that the adsorption capacity of tidal flat different environmental samples ranged from 26.32-204.08 mg/kg and had high affinities for TOC and Fe~(3+)concentration levels. The phosphorus adsorption efficiency. varied from 21.55-248.30 L/kg in this study area, showing obvious correlation with TOC, reflecting adsorption efficiencies were mainly controlled by TOC contents.