太湖沉积物氮磷吸附/解吸特征分析  

Characteristic Analysis of the Adsorption/Desorption of Nitrogen and Phosphorus in the Sediments of Taihu Lake

作　　者：姜霞[1] 王秋娟[1,2] 王书航[1] 金相灿[1] 李永峰[2] 

机构地区：[1]中国环境科学研究院,北京100012 [2]东北林业大学林学院,哈尔滨150040

出　　处：《环境科学》2011年第5期1285-1291,共7页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07101-010);国家自然科学基金项目(21077097)

摘　　要：通过90组吸附/解吸实验研究了太湖沉积物氮、磷的吸附/解吸等温线特征,同时将平衡点浓度、本底吸附量、吸附效率与间隙水、沉积物中各形态氮、磷进行相关性分析,以期对太湖沉积物的"源"、"汇"情况进行分析.结果表明,在供试的浓度范围内,沉积物氮磷的吸附/解吸等温线呈显著线性关系,全湖氮的平均吸附/解吸平衡点浓度为1.10 mg/L;磷的平均吸附/解吸平衡点浓度为0.11 mg/L.平均沉积物本底吸附态氮为23.55 mg/kg、平均本底吸附态磷为11.72 mg/kg,在污染较严重的地区沉积物的本底吸附态氮磷值较大;沉积物对氮的平均吸附效率为23.14 L/kg,对磷的平均吸附效率为102.09 L/kg.氮、磷吸附/解吸平衡点浓度均与间隙水、沉积物中氨氮和无机磷表现出明显的相关性.通过吸附/解吸平衡点的分析发现:从总体上看,太湖沉积物是上覆水体营养盐的"源".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.

关 键 词：太湖 氮 磷 吸附/解吸 吸附速率 

分 类 号：X524[环境科学与工程—环境工程]