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Pirimiphos Ethyl‐Clay Surface Interactions
Author(s) -
Mingelgrin U.,
Gerstl Z.,
Yaron B.
Publication year - 1975
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/sssaj1975.03615995003900050016x
Subject(s) - kaolinite , bentonite , hydrolysis , chemistry , phosphorus , pesticide , phosphate , moisture , clay soil , nuclear chemistry , organic chemistry , chemical engineering , mineralogy , soil water , agronomy , geology , soil science , engineering , biology
Abstract Pirimiphos ethyl (PE) losses on Na‐kaolinite and Na‐bentonite were investigated, and the effect of moisture and temperature on the clay‐pesticide interactions determined. The behavior of PE on clay surfaces is discussed in view of the behavior of other organo‐phosphorus pesticides, and the mechanism of the hydrolysis of organo‐phosphorus pesticides catalyzed by clay surfaces. The data suggest that the dominant mode of loss is the hydrolysis of the phosphate ester bond with the pyrimidine ring of pirimiphos ethyl. Hydrolysis occurred at a significant rate on air‐dried Na‐kaolinite at 23C and 47C and on oven‐dried as well as air‐dried Na‐bentonite at 47C.