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Mechanism of Dinitrophenol Herbicide Sorption by Smectites in Aqueous Suspensions at Varying pH

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^b USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011
^c Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907
^d Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824

View larger version (14K): [in this window] [in a new window]   Fig. 1. Structure and selected physicochemical properties of 4,6-dinitro-o-cresol (DNOC).

View larger version (26K): [in this window] [in a new window]   Fig. 2. Adsorption of dinitro-o-cresol (DNOC) by (A) untreated and freeze-dried K+–saturated smectite suspensions (K-SWy-2 and K-SAz-1), and (B) untreated and freeze-dried C2+–saturated smectite suspensions (Ca-SWy-2 and Ca-SAz-1) as a function of pH.

View larger version (13K): [in this window] [in a new window]   Fig. 3. (A) The K+ concentration in solution minus background electrolyte representing K+ derived from K+–saturated SAz-1 smectite in the presence () and absence () of dinitro-o-cresol (DNOC), and (B) the Ca2+ concentration in solution minus background electrolyte representing Ca2+ derived from Ca2+–saturated SWy-2 smectite in the presence () and absence () of DNOC as a function of pH.