Abstract
The relative ease of protonation and/or hydrolysis of s-triazine herbicides due to reactions on soil mineral surfaces may be measured by exposure of films of calcium-saturated montmorillonite to chloroform solutions of the s-triazines for appropriate time periods. s-Triazines susceptible to protonation are transformed into organic cations and adsorbed into the interlamellar region of the montmorillonite. Upon interlamellar adsorption of the s-triazine the concentration becomes sufficiently high to be detected by infrared techniques in the 1500 to 1800 cm-1 region. Hydrolysis of the triazines due to the "surface acidity" of the mineral surface is indicated by formation of a carbonyl band having a frequency at about 1750 cm-1. The relative degree of protonation and hydrolysis has been measured for twenty-seven chloro-, bromo-, methoxy-, and methylthio-s-triazines. These observations aid in predicting physiochemical behavior of s-triazines in soils as well as formulations containing similar mineral surfaces.
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