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A Simple Sand Column Laboratory Exercise to Illustrate Pollutant Hydrology in Groundwater Systems
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A Simple Sand Column Laboratory Exercise to Illustrate Pollutant Hydrology in Groundwater Systems
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Journal Article
A Simple Sand Column Laboratory Exercise to Illustrate Pollutant Hydrology in Groundwater Systems
2007
Overview
The transport of pollutants in groundwater systems is an important concept taught in contaminant hydrology. Yet, surprisingly, no relevant soil column experiments have been described in the pedagogical literature (Journal of Chemical Education, Chemical Education Research and Practice, or Journal of Geoscience Education). This experiment illustrates the transport of tracers in a sand column using the conservative (non-retained and non-reactive) tracer fluorescein, along with a step input of non-conservative (retained/adsorbed) cadmium ion. The experiment is easy to set up, uses inexpensive commercially-available glassware and sand, and is highly reproducible. Step inputs of conservative tracer elute in one pore volume (the volume needed to completely replace the water held in the saturated column), with cadmium eluting in three pore volumes. This experiment can be completed in two, three-hour laboratory periods.
