[Characteristic analysis of the adsorption/desorption of nitrogen and phosphorus in the sediments of Taihu Lake].

The adsorption isotherms curves of 90 simples were studied in Taihu Lake through the experiment of adsorption/desorption. And the relation between the equilibrium concentrations, NAP, adsorption efficiency and corresponding parameter in interstitial water and sediment has been analyzed, in order to analyze the "source" and "collection" of Taihu. The results showed that the isotherms curves of nitrogen and phosphorus in the sediment had significant correlations in the range of the concentrations of experiment. The average equilibrium concentrations of nitrogen and phosphorus are 1.10 mg/L and 0.11 mg/L respectively. The average of NAP of nitrogen and phosphorus are 23.55 mg/kg and 11.72 mg/kg respectively. The NAP of nitrogen and phosphorus are higher in the area of serious pollution. The average adsorption efficiency of nitrogen and phosphorus are 23.14 L/kg and 102.09 L/kg respectively. Significant correlations were found between the equilibrium concentrations of adsorption/desorption of nitrogen and phosphous and corresponding parameter in interstitial water or sediment. Overall the sediment is the "source" of the nitrogen and phosphorus.