Influence of Smectite Hydration and Swelling on Atrazine Sorption Behavior

M A R K A . C H A P P E L L , * , † D A V I D A . L A I R D , ‡ M I C H A E L L . T H O M P S O N , † H U I L I , § B R I A N J . T E P P E N , § V A N E E T A G G A R W A L , § C L I F F T . J O H N S T O N , ¶ A N D S T E P H E N A . B O Y D § Department of Agronomy, Agronomy Hall, Iowa State University, Ames, Iowa, 50011, National Soil Tilth Laboratory, USDA-ARS, Ames, Iowa, 50011, Department of Agronomy, Agronomy Hall, Iowa State University, Ames, Iowa, 50011, Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824-1325, Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824-1325, Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824-1325, Crop, Soil and Environmental Sciences, Purdue University, West Lafayette, Indiana 47907-2054, and Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824-1325.