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Acta Scientiae Circumstantiae. 2014, (12) Core

Characteristics of phosphorus adsorption on surface sediments of Dianchi LakeChinese Full Text

CHEN Chunyu;XU Xiaomei;DENG Weiming;HE Jia;WANG Shengrui;JIAO Lixin;LI Sen;XU Di;Kunming Institute of Environmental Science;State Environmental Protection Key Laboratory for Lake Pollution Control,Research Center for Lake Eco-environment,Chinese Research Academy of Environment Sciences;

Abstract: The exchange process of phosphorus（ P） at the sediment-water interface from a plateau lake is regulated by equilibrium dynamics. Adsorption characteristics of phosphate on the surface sediments from Dianchi Lake were determined by kinetics and thermodynamics experiments. The relationships between adsorption parameters and P forms of sediment were also investigated. The results indicated that: 1The rank order of P contents in the surface sediments was O-P ＞Ca-P ＞Al-P ＞Res-P ＞Fe-P ＞NH4Cl-P.2Adsorption kinetics of phosphate on the surface sediments was divided into two stage,the rapid adsorption stage that mainly occurred in the first 0.5 h and the slow adsorption stage in 0.5 4 h. Afterwards,the process for all the sediments reached adsorption equilibrium.3The soluble active phosphorus（ SRP） concentrations of overlying water in the northern coast of Waihai Lake and the Caohai Lake were significantly lower than Zero Equilibrium P Concentration（ EPC0） of the sediments. In contrast,the SRP concentrations of overlying water were significantly higher than the EPC0 in the sediment from the other lake areas. These results indicated that P release is almost negligible for most areas of Dianchi Lake and large P release from sediments was mainly present at local lakes.4The maximum P-sorption capacity（ Qmax） and the total maximum Psorption capacity（ TQmax） of sediment were found at the southern coast of Waihai Lake. 5Significantly positive correlation was found between native adsorbed phosphate（ NAP） and Ca-P（ R2= 0.5139,p＜0.05）,but not for the others. 6Comparing with Taihu Lake,Poyang Lake and Chaohu Lake,the sediments from Dianchi Lake had the highest values of NAP and Qmax. These results indicated the P retention in the sediments of Dianchi Lake.
Keywords：

Dianchi Lake; sediments; phosphate; adsorption;

  • DOI：

    10.13671/j.hjkxxb.2014.0709

  • Series：

  • Subject：

  • Classification Code：

    X524

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