Skip Navigation LinksHome > April 2013 - Volume 178 - Issue 4 > Preferential Solute Transport in a Loess Silt Loam Soil
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Soil Science:
doi: 10.1097/SS.0b013e318299677d
Technical Article

Preferential Solute Transport in a Loess Silt Loam Soil

Yang, Ting1; Wang, Quanjiu1,2; Zhou, Beibei1,2; Warrington, David2

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Abstract

Abstract: Solute transport in subsurface systems often causes unexpected groundwater contamination and has received much attention from environmental researchers. There is, thus, interest in observing the pathways that speed up solute transport to subsurface water. In our study, preferential solute transport with the effects of different transport ions, three solute application methods (small pulse; large pulse; duration pulse), and two pore water velocities (slow 1.47 cm/h, fast 3.34 cm/h) were studied in undisturbed, saturated, silt loam soil columns, using miscible experiments. The solute transport process is simulated by the two-flow region model. Results indicated that (i) the breakthrough curves (BTCs) for different input methods varied greatly, but bimodal peaks were present for both small and large pulse inputs; (ii) the peak appeared significantly later for larger pulse input; (iii) when the pore water velocity was higher, asymmetry and tailing of BTCs were significant for the same input method and breakthrough time advanced and was not dependent on the input method; and (iv) shapes of the BTCs for Cl  and NO3 were similar, showing both asymmetry and bimodal peaks, except for the peak values. With regard to the adsorbed ions, Cu2 + behaved differently from the anions under the same input method conditions, and its relative concentrations were much lower. The two-flow region model is more significant for characterizing solute transport.

© 2013Wolters Kluwer Health | Lippincott Williams & Wilkins

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