High flow event induced the subsurface transport of particulate phosphorus and its speciation in agricultural tile drainage system. (January 2021)

• Record Type: Journal Article
• Authors: Jiang, Xiaoqian; Livi, Kenneth J.T.; Arenberg, Mary R.; Chen, Ai; Chen, Kai-yue; Gentry, Lowell; Li, Zhe; Xu, Suwei; Arai, Yuji
• Is Part Of: Chemosphere. Volume 263(2021)
• Publication Date: 2021-01
• Subjects: Phosphorus (P) -- Speciation -- Subsurface transport -- Colloid -- Particulate P; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.128147
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Subsurface storm flow of phosphorus (P), including particulate P, has been recently discussed as an important P transport path in contrast to typical surface runoff events. However, P speciation, and P concentration during storm events has not been extensively investigated; therefore, its contribution to the water quality is not clearly understood. In this study, the physicochemical properties of particulate P in tile water samples during a high flow event were investigated in Midwestern agricultural lands using wet chemical methods, 31P Nuclear Magnetic Resonance spectroscopy and P K-edge X-ray absorptions near edge structure spectroscopy. In slightly alkaline pH tile water, total P was ranging from ∼0.06 to 0.22 mg L −1, which is significantly greater than dissolved reactive P (DRP) (∼0.02–0.08 mg L −1 ). The tile water contains P enriched particulate matters (∼200–660 mg L −1 ). Total P in the colloidal fraction was from 1013 to 2270 mg kg −1 . Phosphate and organic P species, especially monoesters, are sorbed in soil colloids like calcite, and iron oxides, and colloids are effective carriers of P in the subsurface transport process during storm events. The results of this study show that storm events can accelerate the subsurface transport of P with soil particles in addition to DRP. Graphical abstract: Image 1 Highlights: Storm flow induced P release was monitored in agricultural tile waters. The release of TP in particulate P was far greater than DRP during storm events. The concentration of DRP exceeds the eutrophication inducible P level. Both organic and inorganic P were equally important P species in particulate P. Phosphorus is enriched in iron oxyhydroxide nanoclusters in tile waters.