摘要
取样测定了于桥水库底泥无机磷各组分含量及其平面和竖向分布,无机磷总量为284～704mg/kg,平均为485.70mg/kg,其中Ca2-P、Ca8-P、Al-P、Fe-P、O-P和Ca10-P所占质量分数平均分别为3.5%、2.9%、0.3%、48.5%、2.9%和41.9%。通过模拟释放实验得出,在pH<8和pH=9.10条件下,由于厌氧使得底泥磷释放的启动溶解氧分别为<1、<2mg/L。底泥磷在pH=6.50、DO<1mg/L,pH=9.10、DO>5mg/L,pH=9.10、DO<1mg/L的3种条件下的极限释放量为0.24、0.17、0.33mg/g,分别占底泥无机磷总量的41.7%、29.5%和57.3%(质量分数)。释放的磷主要来自Fe-P,但Fe-P也只能部分释放。酸性条件下,有部分Ca2-P、Ca8-P、Ca10-P和Al-P释放,对于Al-P,低pH酸溶作用要远大于高pH下OH-置换作用。
Inorganic phosphorus species present in Yuqiao Reservoir sediment samples were determined. The concentrations of total inorganic phosphorus （TP） were 284-704 mg/kg, with an average of 485.70 mg/kg; the TP concentration decreased from upstream to downstream. The TP fractions of Ca2-P, Ca8-P, A1-P, Fe-P, O-P and Ca,O-P were 3.5% ,2.9% ,0.3%,48.5% ,2.9% and 41.9% respectively. The maximum potential TP release from sediment （TP=0.58 mg/g） were 0.24 mg/g, 0.17 mg/g and 0.33 mg/g under the conditions of pH=6.50 and DO 〈1 mg/L, pH=9.10 and DO〉5 mg/L, and pH=9.10 and DO〈1 mg/L, respectively. Most released phosphorus came from Fe-P which was partially dissolved under the test conditions. TP was also released from Ca2-P, Ca8-P, Ca10-P and A1-P at pHi6.50. More TP released from A1-P by dissolution at an acidic pH than that came from the replacement of OH^- for PO4^3- at a basic pH.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2008年第3期8-12,共5页
Environmental Pollution & Control
基金
国家“863”计划项目(No.2002AA601140)
关键词
底泥
磷
组分
释放
于桥水库
sediment
phosphorus
forms
release
Yuqiao Reservoir
作者简介
丛海兵，男，1968年生，博士研究生，副教授，主要从事水微污染控制研究。
