Humic Acid Transport in Water-Saturated Porous Media |
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| Authors: | Xiaorong Wei Mingan Shao Robert Horton Xinning Han |
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| Institution: | (1) Institute of Soil and Water Conservation, Northwest Sci-Tech. University of Agriculture and Forestry, Yangling, Shaanxi Province, 712100, China;(2) State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS and MWR, Yangling, Shaanxi Province, 712100, China;(3) Department of Agronomy, Iowa State University, Ames, IA 50011, USA;(4) Ningxia Teachers University, Guyuan, Ningxia, 756000, China |
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| Abstract: | The presence of humic acid (HA) in water poses environmental problems because it enhances the transport of several contaminants.
A series of column experiments was conducted toward studying HA transport in different porous media under various pH, ionic
strength, and flow rate conditions. The results showed that decreasing pH and increasing ionic strength increased adsorption
and therefore delayed the transport of HA in porous media. However, increasing flow rate accelerated the transport of HA in
porous media. The effects of pH, ionic strength, and flow rate varied with the solid matrix and were more evident in sands
of smaller average particle diameter than in those with larger ones. These factors must be considered when predicting the
environmental fate of HA. The results also suggested that HA adsorption was an important process controlling HA transport
and should be considered in studies of HA behavior in porous media. |
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