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Metolachlor Dechlorination by Zerovalent Iron during Unsaturated Transport

H.M. Gaber, S.D. Comfort*, P.J. Shea and T.A. Machacek

School of Natural Resource Sciences, Univ. of Nebraska, Lincoln, NE 68583-0915



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  		Fig. 1. Changes in metolachlor concentration, 14C activity, pH, and production of Cl- following the addition of Fe0 and Fe0 + Al2(SO4)3 under batch conditions. Bars on symbols represent sample standard deviations; where absent, bars fall within symbols.

 


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  		Fig. 2. Changes in metolachlor concentration and production of dechlorinated metolachlor following 2 h of treatment with various Fe0 to Al2(SO4)3 ratios under batch conditions. Bars on symbols represent sample standard deviations; where absent, bars fall within symbols.

 


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  		Fig. 3. Metolachlor breakthrough curves (BTCs) during unsaturated transport through soil columns assembled with and without 50:50 iron [Fe0 + Al2(SO4)3]–sand barriers.

 


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  		Fig. 4. The effects of Al2(SO4)3 and iron source on metolachlor breakthrough curves (BTCs) during unsaturated transport through soil columns assembled with 25:75 iron–sand barriers.

 


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  		Fig. 5. Metolachlor and dechlorinated metolachlor breakthrough curves (BTCs) eluted from columns containing 25:75 iron–sand barriers and packed with metolachlor-contaminated soil.

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2002 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.