Transport of Rare Earth Element-Tagged Soil Particles in Response to Thunderstorm Runoff

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• 作者：Gerald Matisoff ; Michael E. Ketterer ; Christopher G. Wilson ; Ricky Layman ; and Peter J. Whiting
• 刊名：Environmental Science & Technology
• 出版年：2001
• 出版时间：August 15, 2001
• 年：2001
• 卷：35
• 期：16
• 页码：3356 - 3362
• 全文大小：125K
• 年卷期：v.35,no.16(August 15, 2001)
• ISSN：1520-5851

文摘

The downslope transport of rare earth element-taggedsoil particles remobilized during a spring thunderstorm wasstudied on both a natural prairie and an agricultural fieldin southwestern Iowa (U.S.A.). A technique was developedfor tagging natural soils with the rare earth elements Eu,Tb, and Ho to ~1000 ppm via coprecipitation with MnO₂.Tagged material was replaced in target locations; surficialsoil samples were collected following precipitation and runoff;and rare earth element concentrations were determinedby inductively coupled plasma mass spectrometry. Diffusionand exponential models were applied to the concentration-distance data to determine particle transport distances.The results indicate that the concentration-distance dataare well described by the diffusion model, but the exponentialmodel does not simulate the rapid drop-off in concentrationsnear the tagged source. Using the diffusion model,calculated particle transport distances at all hillsidelocations and at both the cultivated and natural prairiesites were short, ranging from 3 to 73 cm during this singlerunoff event. This study successfully demonstrates anew tool for studying soil erosion.