Interactions between organophosphorus compounds and soil materials I. Adsorption of ethyl methylphosphonofluoridate by clay and organic matter preparations and by soils

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Abstract
Data for the adsorption of ethyl methylphosphonofluoridate from aqueous and the vapour phases onto montmorillonite and kaolinite clays, onto soil organic matter preparations, and onto a limited number of soils are reported. These show that the phosphonofluoridate was absorbed from the vapour phase onto the dry clay preparations by physical‐chemical forces but was not adsorbed by the organic soil materials. In a general way adsorption onto dry soils could be related to their clay contents when the organic matter contents were low. Water was found to compete effectively with the phosphonofluoridate for adsorption sites, and it is concluded that this molecule will be most effectively retained by dry soils low in organic matter and rich in clay. Mechanisms for its adsorption onto clays are discussed.