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Suitability of Fiberglass Wicks to Sample Colloids from Vadose Zone Pore Water

Szabolcs Czigánya, Markus Flurya,*, James B. Harsha, Barbara C. Williamsb and Jason M. Shirab

a Department of Crop and Soil Sciences, Center for Multiphase Environmental Research, Washington State University, Pullman, WA 99164
b Department of Biological and Agricultural Engineering, University of Idaho, Moscow, ID 83844



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Fig. 1. Experimental setup for the wick experiments.

 


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Fig. 2. Electrophoretic mobility of the colloids as a function of pH, measured in a 1.67-mM Na2CO3/NaHCO3 solution. Error bars denote ± one standard deviation.

 


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Fig. 3. Scanning electron micrographs of (a) nontreated wick fiber (as received from supplier), (b) treated wick fiber (combusted and washed), and (c) treated wick fiber covered with kaolinite particles (after kaolinite breakthrough experiment).

 


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Fig. 4. Distribution of water content as a function of height above the bottom of the wick for different water flow rates. Error bars denote ± one standard deviation (n = 3).

 


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Fig. 5. Nitrate breakthrough curves at pH {approx}7 (a) for different flow rates in the same wick, (b) for 10 mL h–1 flow rate in three different wicks, and (c) for 55 mL h–1 flow rate in three different wicks.

 


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Fig. 6. Breakthrough curves of native and modified Hanford colloids at different flow rates and pH. Breakthrough curves at the same flow rate within one plot are repetitions with different wicks.

 


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Fig. 7. Breakthrough curves of pure mineral colloids at different flow rates and pH.

 


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Fig. 8. In-wick and among-wick variability for three repeated breakthrough curves using native colloids at pH {approx}10.

 





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Soil Science Society of America Journal
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Environmental Quality
The Plant Genome
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