Adsorption Characteristics of Phosphorus onto Soils from Water Level Fluctuation Zones of the Danjiangkou Reservoir

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• 作者：Chao Du ; Xianyou Ren ; Liang Zhang ; Meng Xu ; Xiaojun Wang ; Yanhua Zhuang and Yun Du
• 刊名：CLEAN 胠SOIL, AIR, WATER
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：44
• 期：8
• 页码：975-983
• 全文大小：2396K
• ISSN：1863-0669

文摘

A comparative study was conducted to investigate the adsorption characteristics of phosphorus (P) on two soil samples collected from a typical subtropical reservoir and to reveal the possible influence of alternating exposure and inundation on the P adsorption onto soil in a water level fluctuation zone. Short-term batch experiments were performed, and characterization methods, such as scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy, were also used. The P adsorption kinetics for both soils was best described by a pseudo-second order model (R² > 0.99). A modified Langmuir model described the P adsorption on both samples well, and low temperature increased the risk of releasing soil P into the overlying water. Low pH values were not conducive to the P adsorption process. It appeared that alternating exposure and inundation had no significant impact on the adsorption capacity of P onto soil from water level fluctuation zones in this research. pH, SEM, and FT-IR analyses demonstrated that Fe, Al, and Ca contained in the clay minerals of the soil played an important role in the adsorption of P onto soil from water level fluctuation zone.