The distribution of polycyclic aromatic hydrocarbons (PAHs) in the ocean is affected by the sorption-desorption process of sediment particles. This process is determined by the concentration of PAHs in seawater, water temperature, and organic matter content of sediment particles. Quantitative relationships between the net sorption rates (=the difference of sorption and desorption rates) and these factors have not been established yet and used in PAH transport models. In this study, phenanthrene was chosen as the representative of PAHs. Three groups of experimental data were collected to address the dependence of the net sorption processes on the initial concentration, water temperature, and organic carbon content representing organic matter content. One-site and two-compartment mass-transfer models were tested to represent the experimental data using various parameters. The results showed that the two-compartment mass-transfer model performed better than the one-site mass-transfer model. The parameters of the two-compartment mass-transfer model include the sorption rate coefficients and (L g min), and the desorption rate coefficients and (min). The parameters at different temperatures and organic carbon contents were obtained by numerical simulations. Linear relationships were obtained between the parameters and water temperature, as well as organic carbon content. , and decreased linearly, while increased linearly with temperature. , and increased linearly, while decreased linearly with organic carbon content. The values between the simulation results based on the relationships and the experimental results reached 0.96–0.99, which supports the application of the model to simulate sorption-desorption processes at different water temperatures and organic carbon contents in a realistic ocean.

中文翻译：

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沉积物颗粒对菲净吸附的模拟及参数确定


海洋中多环芳烃（PAH）的分布受到沉积物颗粒吸附-解吸过程的影响。这个过程是由海水中多环芳烃的浓度、水温和沉积物颗粒的有机物含量决定的。净吸附率（=吸附率和解吸率之差）与这些因素之间的定量关系尚未建立并用于 PAH 传输模型。本研究选择菲作为多环芳烃的代表。收集了三组实验数据，以解决净吸附过程对初始浓度、水温和代表有机物含量的有机碳含量的依赖性。测试了单位点和两室传质模型以代表使用各种参数的实验数据。结果表明，二室传质模型比一室传质模型表现更好。二室传质模型的参数包括吸附速率系数和(L g min)，以及解吸速率系数和(min)。通过数值模拟得到了不同温度和有机碳含量下的参数。获得了参数与水温以及有机碳含量之间的线性关系。 ，并且随温度线性减小，而随温度线性增加。 ，并随有机碳含量线性增加，同时线性降低。基于关系式的模拟结果与实验结果之间的数值达到了0.96-0。99，它支持模型的应用来模拟现实海洋中不同水温和有机碳含量下的吸附-解吸过程。