Adsorption and Desorption Characteristics of Phosphorus on Sediments in Panzhihua Section of Jinsha River, China. Issue 4 (February 2021)

• Record Type: Journal Article
• Authors: Peng, Hong; Jiang, Anna; Wang, Hao
• Is Part Of: IOP conference series. Volume 651:Issue 4(2021)
• Publication Date: 2021-02
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/651/4/042059
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: To characterize P adsorption-desorption in the riverbed sediments, we studied sediment physicochemical parameters affecting P dynamics, adsorption-desorption parameters such as P desorption maximum, equilibrium P concentration and P desorption capacity of bed sediments by a batch experiment. The results showed that the adsorption-desorption rate of phosphorus on sediment obviously increased, then slightly decreased, and finally reached equilibrium at 90 min of reaction. The desorption concentration of phosphorus on the surface of sediment was 0.45 mg/L when the rotational speed was 250 r/min. The increase of sediment concentration facilitated the transformation of phosphorus from dissolved state to adsorbed state. When the sediment particle size was less than 0.074 mm, the equilibrium adsorption and desorption capacity of phosphorus were 0.47 mg/g and 0.43 mg/L, respectively. In addition, high temperature was beneficial to the adsorption of phosphorus, but rarely affect the desorption of phosphorus in the sediment. The pH value of solution has little impact on the adsorption and desorption of phosphorus.