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Adsorption and Desorption of Diquat, Paraquat, and Prometone by Montmorillonitic and Kaolinitic Clay Minerals
Author(s) -
Weber J. B.,
Weed S. B.
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200040020x
Subject(s) - diquat , montmorillonite , kaolinite , adsorption , paraquat , chemistry , clay minerals , desorption , ion exchange , cation exchange capacity , inorganic chemistry , environmental chemistry , mineralogy , ion , geology , organic chemistry , soil water , soil science
The adsorption of diquat, paraquat, and prometone by montmorillonite and kaolinite clays and their desorption using several extracting solutions has been investigated. Diquat and paraquat were adsorbed by the clay minerals to approximately the cation‐exchange capacity of the clays. Approximately 80% of each of the herbicides was displaced from kaolinite clay with Ba 2+ ions. A total of 5% of each of the compounds was removed from montmorillonite using 1 M BaCl 2 solutions. The two herbicides were found to exchange for one another on both clay minerals in a one‐for‐one manner. Paraquat was preferentially adsorbed over diquat by both clays in competitive ion studies and was also found to be more difficult of the two herbicides to displace. Prometone which was adsorbed by the montmorillonite clay was more readily desorbed with deionized water than with 1 M BaCl 2 . Small amounts of prometone which were adsorbed by the kaolinite clay were also readily desorbed by deionized water.