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_O 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的影响，研究了5′-磷酸腺苷（AMP）对长江口及邻近地区沉积物的吸附动力学和热力学。动力学曲线可以用二室一阶方程来描述，平衡等温线与改进的 Langmuir 和 Freundlich 模型拟合良好。吸附后有机磷 (OP) 组分变化的分析表明，可交换或松散吸附的_P2O增加最为显着。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 的含量呈明显的正相关关系，表明有机质而非 Fe/Al 氧化物对 OP 在长江口及邻区的运移起重要作用。介质的温度、盐度和pH值对AMP的吸附有显着影响。根据热力学参数的计算，温度升高有利于AMP的吸附，这是一个自发的放热过程。在我们研究范围内的中等盐度下，吸附容量更高。随着 pH 值从 3 变化到 10，吸附容量呈现“U 趋势”曲线。