State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China.
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China; Guangzhou Meizhou Reservoir Management Office, Huizhou 516870, China.
J Contam Hydrol. 2020 Nov;235:103717. doi: 10.1016/j.jconhyd.2020.103717. Epub 2020 Sep 23.
River sediment typically acts a 'sink' or 'source' of phosphorus for the overlying water owing to the adsorption of phosphorous by the sediment or release of phosphorous to the water, respectively. In this study, a method is proposed for the determination of the equilibrium concentration of the total phosphorus (EC) and total phosphorus release rate (R). Phosphorus release experiments were conducted on natural river sediments in flowing water with a low velocity under different water temperatures. An empirical equation was established for the correlation between EC and R at an arbitrary temperature and at 20 °C. The results indicate that an increase in the water temperature significantly enhances the phosphorus release. In comparison with total phosphorus, dissolved phosphorus and particulate phosphorus in the overlying water do not change with the water temperature. Thus, the results of this study aid in understanding the contaminant exchange between sediments and water in flowing rivers.
由于河流沉积物对磷的吸附或释放，河流沉积物通常是上覆水体磷的“汇”或“源”。在本研究中，提出了一种用于测定总磷（EC）平衡浓度和总磷释放率（R）的方法。在不同水温下，在低流速的流动水中对天然河沉积物进行了磷释放实验。建立了任意温度和 20°C 时 EC 与 R 之间的经验方程。结果表明，水温升高显著增强了磷的释放。与总磷相比，上覆水中的溶解磷和颗粒磷不随水温变化。因此，本研究的结果有助于了解流动河底泥与水之间污染物的交换。
