Remobilization Dynamics of Caffeine, Ciprofloxacin, and Propranolol following Evaporation-Induced Immobilization in Porous Media

Environmental Science & Technology
Hayley J NormileTohren C G Kibbey

Abstract

Changing weather conditions can cause cycles of wetting and drying in the unsaturated zone. When porewater evaporates, any nonvolatile solutes present in the pores will be driven to adsorb and ultimately precipitate on solid surfaces. When media are subsequently resaturated through rainfall infiltration, the remobilization of solutes likely depends on both the hydraulics of resaturation and the dynamics of dissolution processes. The focus of this work was to study the dynamics of remobilization of three different emerging contaminants (caffeine, ciprofloxacin, and propranolol) and two model compounds (fluorescein and sulforhodamine B) from porous media following evaporation of porewater. Remobilization column experiments were conducted to study this phenomenon and were evaluated using a finite difference model developed to simulate the adsorption-desorption dynamics during resaturation and elution. Results indicate that dissolution dynamics become increasingly important with increasing adsorption affinity for solid surfaces. Trends in observed elution behavior are not well-predicted from chemical properties, such as solubility. One of the most significant observations of the work is the presence of spikes in elution concentrati...Continue Reading

References

Mar 12, 2002·Pharmaceutical Research·Christel A S BergströmPer Artursson
Jul 26, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Lixia Chen, Tohren C G Kibbey
Aug 22, 2006·International Journal of Pharmaceutics·Aristides Dokoumetzidis, Panos Macheras
Sep 8, 2007·Environmental Science & Technology·Tohren C G KibbeyLixia Chen
Apr 16, 2008·Environmental Science & Technology·Lixia ChenTohren C G Kibbey
Feb 7, 2012·Environmental Pollution·D J LapworthR S Ward
Aug 2, 2013·Bioresource Technology·Zhanguang LiuYalei Zhang
Oct 5, 2013·Water Research·John Zhou, Nicola Broodbank

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