摘要
研究了位于北京郊区的北运河中游9个断面的沉积物对磷的吸附行为,分析了沉积物组成及其理化性质与磷吸附特征的关系。实验结果表明,不同断面沉积物对磷的最大吸附量在0.11～9.45 mg/g之间,而各断面沉积物的临界平衡磷浓度(EPC0)范围在0.33～1.85 mg/L之间,统计分析显示EPC0与河水中的总磷和可溶性无机磷呈显著负相关,但与沉积物中的金属和有机质含量相关性较差;根据临界平衡磷浓度定义的推断,新华大街桥、玉带桥、运河大街桥、六环路桥、宋梁路桥、湿地和甘棠橡胶坝7个断面的沉积物表现为磷的"汇",而丰子沟和减运沟2个点表现为磷的"源",并且各点沉积物释放和吸附磷的趋势较大。
Sorption behavior of phosphorus on sediment samples taken from the middle reach of North Canal River in 9 different sites were determined in laboratory, and the correlation between physical - chemical properties of the sediments and their phosphorus sorption characteristics was analyzed. The results showed that the maximum sorption capacities on sediments were 0. 11 -9.45 mg/g. The zero equilibrium P concentration （ EPC0 ） of the sediments ranged from 0. 33 to 1.85 mg/L, which showed significant relation to the contents of total phosphorus （TP） and soluble phosphorus（DIP） in water and bad correlations with metallic compound and organic matter in the sediments statistically. According to EPC0 identity, sediments from Xinhua Bridge, Yudai Bridge, Yunhe Bridge, Liuhuan Bridge, Songliang Bridge, Wet Land and Gantang Dam were sinks of phosphorus, while sediments from Fengzi Runway and Jianyun Runway were sources of phosphorus. Moreover, the trend of the sorption and desorption capacities of these sediments on phosphorus varied obviously.
出处
《环境科学与管理》
CAS
2013年第4期57-62,共6页
Environmental Science and Management
基金
国家水体污染控制与治理科技重大专项(2012ZX07209-001)
北京市科技新星计划(2009B31)
关键词
沉积物
磷
吸附
临界平衡磷浓度
sediments
phosphorus
sorption
zero equilibrium P concentration
