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Reactions of 12 s‐Triazines with Soil Clays
Author(s) -
Brown Cyril B.,
White Joe L.
Publication year - 1969
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/sssaj1969.03615995003300060020x
Subject(s) - hydrolysis , chemistry , simazine , protonation , thio , triazine , atrazine , adsorption , chloroform , organic chemistry , nuclear chemistry , pesticide , ion , agronomy , biology
Twelve herbicides—chloro, methoxy and methyl‐thio compounds—of the s ‐triazine family were reacted with chloroform and water suspensions of soil clays of varying mineralogical composition, and also with Wyoming bentonite. IR spectra of air‐dried KBr pellets of the reacted samples were made. NMR data of a chloro and methoxy s ‐triazine were studied. Data showed that protonation and hydrolysis of the triazine had occurred in certain samples. The highly acidic environment of montmorillonitic clay surfaces provided conditions suitable for the hydrolysis. The order of hydrolysis of the chloro s ‐triazines used in the study is trietazine > chlorazine > propazine > ipazine > simazine = atrazine. The corresponding methoxy or methyl‐thio compound hydrolyzed less than the chloro analogue. Protonation and adsorption are directly related to the basicity of the triazine but hydrolysis has an inverse relation. NMR data can be used to obtain the relative basicities of s ‐triazine herbicides and thus be an indicator of ease of hydrolysis.