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目的 研究添加化学试剂对湖泊底泥内源磷释放的抑制效果,为城市内湖综合治理措施的制定提供技术依据.方法 于2008年5月20日,采集莫愁湖上层底泥样品和水样.对底泥进行磷形态[总磷(TP)、NaOH-P、HCl-P、无机磷(IP)、有机磷(OP)]的分析,测定水样的pH值和TP的含量.分别向水(250ml)-底泥(10g)系统中投加0～1 000.0mg/L的Ca(OH)_2、0～10.0 mg/L的Al_2(SO_4)_3和0-25.0mg/L的FeCl_3,测定水样pH值和TP的含量,并计算TP的释放控制率.结果 莫愁湖水样的pH值在7.6～8.0之间,TP含量为2.0 mg/L.底泥中的TP、HCl-P、NaOH-P、IP、OP的含量分别为2 187.06、1 383.89、526、48、1910.37、276.69mg/kg.随着Ca(OH)_2:浓度的增加,水体pH值迅速上升,TP含量呈下降趋势,TP的释放控制率呈升高趋势.随着Al_2(SO_4)_3 或FeCl_3浓度的增加,水体pH值略有下降,TP含量呈下降趋势,TP的释放控制率呈升高趋势.结论 Ca(OH)_2、Al_2(SO_4)_3、FeCl_3对湖泊底泥内源磷的释放具有明显的抑制作用.“,”Objective To study the inhibit efficiency of lake sediment phosphorus release by adding chemical reagents and to provide the technical basis for the comprehensive management of city lake.Methods In May 20,2008,Mochou Lake upper sediment and water samples were collected.The phosphorus forms of sediments,total phosphorus (TP),NaOH-P,HCI-P,inorganic phosphorus(IP),organic phosphorus (OP) were analyzed and the pH value and content of TP in water samples were determined.Each water(250 ml)-sediment(10 g)system was respectively added by 0-1 000.0 mg/L of Ca(OH)_2,2.0-10.0 mgL of Al_2(SO_4)_3 and O-25.0 mg/L of FeCl_3,The pH value and content of TP in water were determined,then the control rate of TP release were calculated.Results The pH values were between 7.6-8.0,TP content was 2.0 mg/L in water of Mochou Lake.The contents of TP,HCl-P,NaOH-P,LP,OP were 2 187.06,1 383.89,526.48,1 910.37 and 276.69 mg/kg respectively.With the increase of Ca(OH)_2 concentration,pH valne of water increased rapidly,content of TP showed a decreasing trend,control rate of TP release was increased.With the increase of Al_2(SO_4)_3 or FeCl_3 concentration,pH value of water declined slighfly,content of TP showed a decreasing trend,control rate of TP release was increased.Conclusion Ca(OH)_2,Al_2(SO_4)_3,Fecl_3 can significantly inhibit the phosphorus release of sediments in Mochou Lake.