Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
Environ Pollut. 2022 Oct 15;311:119993. doi: 10.1016/j.envpol.2022.119993. Epub 2022 Aug 19.
In this paper, the kinetics and thermodynamics of Adenosine 5'-monophosphate (AMP) sorption on the sediments obtained from the Yangtze River Estuary and adjacent areas were studied, in combination with the effects of the sediments' properties and media conditions. The kinetics curves could be described by a two-compartment first-order equation, and the equilibrium isotherms fitted well with the modified Langmuir and Freundlich models. The analysis of organic phosphorus (OP) fractions changes after sorption indicated that the contents of exchangeable or loosely sorbed P increased most significantly. Higher organic matter (OM) of the sediments were favorable for the sorption ability. It was also found that the content of OP and OM in the sediments showed an obvious positive correlation, indicating that organic matter rather than Fe/Al oxides played an important role in the migration of OP in the Yangtze River estuary and its adjacent area. Temperature, salinity and pH of the media influenced the sorption of AMP significantly. Increase of temperature was of benefit to the sorption of AMP, which was a spontaneous and exothermic process according to the calculations of the thermodynamic parameters. The sorption capacity was higher at a moderate salinity in the range of our study. With the pH changing from 3 to 10, the sorption capacity exhibited as a "U-trend" curve.
本文结合沉积物性质和介质条件，研究了腺苷 5'-单磷酸（AMP）在长江口及邻近地区沉积物上的吸附动力学和热力学。动力学曲线可以用双室一级方程来描述，平衡等温线很好地符合修正的 Langmuir 和 Freundlich 模型。吸附后有机磷（OP）形态变化分析表明，可交换或松散结合态磷的含量增加最显著。沉积物中较高的有机质（OM）有利于吸附能力。还发现沉积物中 OP 和 OM 的含量呈明显正相关，表明在长江口及其邻近地区，有机质而不是铁/铝氧化物在 OP 的迁移中起重要作用。介质的温度、盐度和 pH 对 AMP 的吸附有显著影响。根据热力学参数的计算，升高温度有利于 AMP 的吸附，这是一个自发的放热过程。在我们研究的范围内，在中等盐度下，吸附容量较高。随着 pH 值从 3 变化到 10，吸附容量呈现出“U 型”曲线。
