摘要
为了研究沉积物表面磷的等温吸附和解吸对耗氧有机物的响应,以威海市金海湾的沉积物为研究对象,以葡萄糖代表耗氧有机物,将沉积物暴露于不同浓度耗氧有机物中30 h,测定并分析沉积物对磷酸盐的表观等温吸附容量。无外源性PO4-P作用下,耗氧有机物浓度为0.00、0.20、0.40、0.80 mg/L时的沉积物对磷酸盐的表观等温吸附容量为负值,分别为-2.31±0.63、-42.70±0.98、-7.84±0.83、-3.54±0.39 mg/kg;外源性PO4-P作用下,沉积物对磷酸盐的表观等温吸附容量存在正负值:PO4-P的初始浓度为2.26 mg/L,相同耗氧有机物浓度下的沉积物对磷酸盐的表观等温吸附容量分别为-5.47±13.90、-13.29±0.97、-13.85±4.36、-0.44±6.44 mg/kg;PO4-P的初始浓度为6.78 mg/L,相同耗氧有机物浓度下的沉积物对PO4-P的表观等温吸附容量分别为-59.74±7.33、28.51±29.28、87.72±48.19、-30.70±31.52 mg/kg;PO4-P的初始浓度为9.04 mg/L,相同耗氧有机物浓度下的沉积物对磷酸盐的表观等温吸附容量分别为-13.15±12.17、-7.57±21.09、-55.05±2.79、87.38±107.33 mg/kg;PO4-P的初始浓度为11.30 mg/L,相同耗氧有机物浓度下的沉积物对PO4-P的表观等温吸附容量分别为67.62±12.80、257.53±51.72、122.08±138.24、201.67±105.42 mg/kg。故外源性PO4-P作用下,耗氧有机物对磷在沉积物表面的吸附、解吸作用具有两重性,这种作用依赖于耗氧有机物浓度和PO4-P的初始浓度。
To study the responses of isothermal adsorption and desorption of phosphorus at sediment surface to oxygen-consuming organic matters, the sediments sampled from Jinhai Bay of Weihai City were used as materials. The glucose represented the oxygen-consuming organic matters. Sediments were exposed to oxygenconsuming organic matters with different concentrations for 30 hours and the apparent isothermal adsorption capacity of phosphate at the sediment surface were determined and analyzed. Without exogenous PO4-P, the apparent isothermal adsorption capacity of phosphate at the sediment surface was negative,-2.31±0.63,-42.70±0.98,-7.84 ± 0.83,-3.54 ± 0.39 mg/kg respectively when the concentrations of oxygen-consuming organic matters were 0.00, 0.20, 0.40, 0.80 mg/L. With exogenous PO4-P, the apparent isothermal adsorption capacity of phosphate varied between positive and negative. The apparent isothermal adsorption capacity of phosphate at the sediment surface under the same concentration of oxygen-consuming organic matters was-5.47±13.90,-13.29±0.97,-13.85±4.36,-0.44±6.44 mg/kg respectively when the initial concentration of phosphate was2.26 mg/L. The apparent isothermal adsorption capacity of phosphate at the sediment surface under the same concentration of oxygen-consuming organic matters was-59.74±7.33, 28.51±29.28, 87.72±48.19,-30.70±31.52 mg/kg respectively when the initial concentration of phosphate was 6.78 mg/L. The apparent isothermal adsorption capacity of phosphate at the sediment surface under the same concentration of oxygen-consuming organic matters was-13.15±12.17,-7.57±21.09,-55.05±2.79, 87.38±107.33 mg/kg respectively when the initial concentration of phosphate was 9.04 mg/L. The apparent isothermal adsorption capacity of phosphate at the sediment surface under the same concentration of oxygen-consuming organic matters was 67.62±12.80,257.53±51.72, 122.08±138.24, 201.67±105.42 mg/kg respectively when the initial concentration of phosphate was 11.30 mg/L. Thus, organic matters have d
作者
张玉群
葛长字
刘丽晓
Zhang Yuqun;Ge Changzi;Liu Lixiao(Marine College,Shandong University,Weihai Shandong 264209)
出处
《中国农学通报》
2020年第20期59-64,共6页
Chinese Agricultural Science Bulletin
基金
山东省自然科学基金“牡蛎壳粉对沉积物中氮磷的双向调节机制”(ZR2016CM06)
关键词
沉积物
磷
耗氧有机物
吸附
解吸
sediment
phosphorus
oxygen-consumed organic matters
adsorption
desorption
