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Movement of Heavy Metals through Preferential Flow Paths under Different Rainfall Intensities

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Authors
Kim, Young-Jin; Steenhuis, Tammo S.; Nam, Kyoungphile
Issue Date
2008-11-28
Publisher
Wiley-Blackwell
Citation
Clean 2008, 36, 984
Keywords
Preferential flowHeavy metalsTransportBreakthrough curvesRainfall intensity
Abstract
Preferential flow in soils deserves attention due to its potential role in accelerating the movement of contaminants to groundwater. This study investigates the movement of Cd, Cu, and Pb through preferential flow paths under different applied rainfall intensities. Artificial acid rain (pH of 4.1) containing CdCl2, CuCl2, and Pb(NO3)2 was applied to undisturbed soil and repacked sand columns at low and high intensities, and leachate metals and chloride concentrations were measured. Cd was found in the leachate at both low and high rates in all columns, while the increase in Cu concentrations in the leachate was detected only at the high rate of the undisturbed columns. Pb was retained in both columns. For undisturbed columns, the breakthrough curves of Cd and Cu were similar to those of Cl, showing early initial breakthrough by preferential flow and dependency on rainfall intensities. The Cd concentrations were detected in the leachate from repacked columns for high rate rainfall, implying that even homogeneous soil may not be perfectly able to retain metals and the initially wet condition is more harmful for subsurface contaminant transport. In conclusion, the study demonstrated that, despite its highly sorptive nature, the transport of some metals may be as fast as that of a tracer under preferential flow conditions,
and the rainfall intensity is a significant factor for the degree of transport.
ISSN
1863-0650 (print)
1863-0669 (online)
Language
English
URI
http://hdl.handle.net/10371/7421
DOI
https://doi.org/10.1002/clen.200800141
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Civil & Environmental Engineering (건설환경공학부)Journal Papers (저널논문_건설환경공학부)
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