沉积物表面磷的等温吸附/解吸行为对耗氧有机物的响应

doi:10.11924/j.issn.1000-6850.casb20190400068

摘要/Abstract

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。

关键词: 沉积物, 磷, 耗氧有机物, 吸附, 解吸

Abstract:

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 oxygen-consuming 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 was 2.26 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 double effects on adsorption and desorption of phosphate at sediment surface with exogenous PO₄-P, and the effects depend on the concentration of oxygen-consuming organic matters and the initial concentration of PO₄-P.

Key words: sediment, phosphorus, oxygen-consumed organic matters, adsorption, desorption

中图分类号:

S913

张玉群, 葛长字, 刘丽晓. 沉积物表面磷的等温吸附/解吸行为对耗氧有机物的响应[J]. 中国农学通报, 2020, 36(20): 59-64.

Zhang Yuqun, Ge Changzi, Liu Lixiao. Isothermal Adsorption/Desorption of Phosphate at Sediment Surface: Responses to Oxygen-consuming Organic Matters[J]. Chinese Agricultural Science Bulletin, 2020, 36(20): 59-64.

图/表 5

图1. 磷酸盐浓度为0 mg/L时的沉积物对磷酸盐的表观等温吸附容量

图2. 磷酸盐浓度为2.26 mg/L时的沉积物对磷酸盐的表观等温吸附容量

图3. 磷酸盐浓度为6.78 mg/L时的沉积物对磷酸盐的表观等温吸附容量

图4. 磷酸盐浓度为9.04 mg/L时的沉积物对磷酸盐的表观等温吸附容量

图5. 磷酸盐浓度为11.30 mg/L时的沉积物对磷酸盐的表观等温吸附容量

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