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Published online 20 September 2006
Published in Soil Sci Soc Am J 70:1889-1895 (2006)
DOI: 10.2136/sssaj2005.0392
© 2006 Soil Science Society of America
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Effects of Increasing Potassium Chloride and Calcium Chloride Ionic Strength on Pesticide Sorption by Potassium- and Calcium-Smectite

Hui Lia, Brian J. Teppena, David A. Lairdb, Cliff T. Johnstonc and Stephen A. Boyda,*

a Dep. of Crop and Soil Sciences, and Environmental Science and Policy Program, Michigan State Univ., East Lansing, MI 48824
b USDA-ARS, National Soil Tilth Lab., Ames, IA 50011
c Crop, Soil and Environmental Sciences, Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907


Figure 1
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  		Fig. 1. Sorption isotherms of (A) alachlor, (B) atrazine, (C) dichlobenil, and (D) diuron by K+–saturated smectite (K-SWy-2) at several KCl ionic strengths.

 

Figure 2
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  		Fig. 2. Pesticide sorption coefficients normalized to the sorption by K+–saturated smectite (K-SWy-2) from 0.30 M KCl solution at the aqueous relative concentration of 0.05 as a function of ionic strength.

 

Figure 3
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  		Fig. 3. Sorption isotherms of (A) alachlor, (B) atrazine, (C) dichlobenil, and (D) diuron by Ca2+–saturated smectite (Ca-SWy-2) in 0.005 M and 0.10 M CaCl2 solutions.

 




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