The amounts and forms of phosphorus （P） in surface sediments of Haihe River, Tianjin, North China, were examined using a sequential chemical extraction procedure. Five fractions of sedimentary P, including loosely s...The amounts and forms of phosphorus （P） in surface sediments of Haihe River, Tianjin, North China, were examined using a sequential chemical extraction procedure. Five fractions of sedimentary P, including loosely sorbed P （NH4Cl-P）, redox-sensitive P （BD-P）, metal oxide bound P （NaOH-P）, calcium bound P （HCI-P）, and residual P （Res-P） （organic and refractory P）, were separately quantified. The results indicated that the contents of different P fractions in the sediments varied greatly. The total P （TP） contents ranged from 968 to 2017 mg/kg. Phosphorus contents in NH4Cl-P, BD-P, NaOH-P, and HCl-P ranged from 6.7 to 26.6 mg/kg, 54.5 to 90.2 mg/kg, 185.2 to 382.5 mg/kg, and 252.3 to 425.5 mg/kg, respectively, which represented 1.2%-3.2%, 7.7%-13%, 33.3%-48.9%, and 36.2%-54.2% of the sedimentary inorganic P, respectively. For all the sediment samples, the rank order of P-fractions was Res-P 〉 HCl-P 〉 NaOH-P 〉 BD-P 〉 NH4Cl-P. The highly positive relationship between the amounts of P released from the sediments and those in the NH4Cl-P and BD-P fractions, indicated that NH4Cl-P and BD-P were the main fractions that can release P easily.展开更多
应用SMT法（The Standards,Measurements and Testing Programme）对南京市江心洲污水处理厂不同处理阶段污泥中磷的形态进行了分析,揭示了污泥中生物有效磷的可利用性和迁移性.结果表明,污泥中的磷主要以无机磷（IP）的形态存在,占总磷...应用SMT法（The Standards,Measurements and Testing Programme）对南京市江心洲污水处理厂不同处理阶段污泥中磷的形态进行了分析,揭示了污泥中生物有效磷的可利用性和迁移性.结果表明,污泥中的磷主要以无机磷（IP）的形态存在,占总磷（TP）的61%以上;有机磷（OP）含量较低,仅为15%-35%;而在无机磷中,非磷灰石无机磷（NAIP）是主要的赋存形态,占IP的60%以上.这表明污泥中的磷具有较高的潜在生物可利用性.TP与NAIP＋OP呈极显著的正相关关系（R^2=0.960 7,p〈0.01）,表明在不具备磷形态分析的情况下,可以通过TP的测定来预测污泥中磷的潜在生物有效性.污泥的理化性质和磷形态含量的相关分析表明,有机质和pH是污泥理化性质中的重要指标,对污泥中磷的潜在环境行为具有重要影响.展开更多
Microbial activity may influence phosphorus （P） deposit and release at the water sediment interface. The properties of DO （dissolved oxygen）, pH, P fractions （TE Ca-E Fe-R OE IP）, and APA （alkaline phospfiatase...Microbial activity may influence phosphorus （P） deposit and release at the water sediment interface. The properties of DO （dissolved oxygen）, pH, P fractions （TE Ca-E Fe-R OE IP）, and APA （alkaline phospfiatase activity） at the water sediment interface were measured to investigate microbial activity variations in surface sediment under conditions of two-month intermittent aeration in overlying water. Results showed that DO and TP of overlying water increased rapidly in the first week and then decreased gradually after 15 day of intermittent aeration. Microorganism metabolism in surface sediment increased pH and decreased DO and TP in the overlying water. After two-month intermittent aeration, APA and OP from surface sediment （0-2 cm） were both significantly higher than those from bottom sediment （6-8 cm） （p 〈 0.05）, and surface sediment Fe-P was transferred to OP during the course of microorganism reproduction on the surface sediment. These results suggest that microbial activity and microorganism biomass from the surface sediment were higher than those from bottom sediment after two-month intermittent aeration in the overlying water.展开更多
基金supported by the Natural Science Foun-dation of Tianjin (No. 09YFSZSF02100)the National Natural Science Foundation of China (No. 50479034)the Commonweal Projects of the Water Conservancy of China (No. 200801135)
文摘The amounts and forms of phosphorus （P） in surface sediments of Haihe River, Tianjin, North China, were examined using a sequential chemical extraction procedure. Five fractions of sedimentary P, including loosely sorbed P （NH4Cl-P）, redox-sensitive P （BD-P）, metal oxide bound P （NaOH-P）, calcium bound P （HCI-P）, and residual P （Res-P） （organic and refractory P）, were separately quantified. The results indicated that the contents of different P fractions in the sediments varied greatly. The total P （TP） contents ranged from 968 to 2017 mg/kg. Phosphorus contents in NH4Cl-P, BD-P, NaOH-P, and HCl-P ranged from 6.7 to 26.6 mg/kg, 54.5 to 90.2 mg/kg, 185.2 to 382.5 mg/kg, and 252.3 to 425.5 mg/kg, respectively, which represented 1.2%-3.2%, 7.7%-13%, 33.3%-48.9%, and 36.2%-54.2% of the sedimentary inorganic P, respectively. For all the sediment samples, the rank order of P-fractions was Res-P 〉 HCl-P 〉 NaOH-P 〉 BD-P 〉 NH4Cl-P. The highly positive relationship between the amounts of P released from the sediments and those in the NH4Cl-P and BD-P fractions, indicated that NH4Cl-P and BD-P were the main fractions that can release P easily.
基金supported by the National Major Science and Technology Project for Water Pollution Control and Management(No. 2008ZX07101-001,2009ZX07101-009)
文摘Microbial activity may influence phosphorus （P） deposit and release at the water sediment interface. The properties of DO （dissolved oxygen）, pH, P fractions （TE Ca-E Fe-R OE IP）, and APA （alkaline phospfiatase activity） at the water sediment interface were measured to investigate microbial activity variations in surface sediment under conditions of two-month intermittent aeration in overlying water. Results showed that DO and TP of overlying water increased rapidly in the first week and then decreased gradually after 15 day of intermittent aeration. Microorganism metabolism in surface sediment increased pH and decreased DO and TP in the overlying water. After two-month intermittent aeration, APA and OP from surface sediment （0-2 cm） were both significantly higher than those from bottom sediment （6-8 cm） （p 〈 0.05）, and surface sediment Fe-P was transferred to OP during the course of microorganism reproduction on the surface sediment. These results suggest that microbial activity and microorganism biomass from the surface sediment were higher than those from bottom sediment after two-month intermittent aeration in the overlying water.
