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Adsorption of s‐Triazines by Montmorillonite As a Function of pH and Molecular Structure
Author(s) -
Weber J. B.
Publication year - 1970
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/sssaj1970.03615995003400030017x
Subject(s) - adsorption , chemistry , montmorillonite , substituent , triazine , melamine , medicinal chemistry , nuclear chemistry , inorganic chemistry , organic chemistry
The effect of pH on the adsorption of 16 structurally related s ‐triazines by Na‐montmorillonite was investigated. Slurry type adsorption techniques were used. The compounds included ametryne, desmetryne, prometryne, GS 14253, GS 14260, GS 16065, atrazine, SD‐15418, dyrene, atratone, prometone, GS 28533, melamine, ammeline, ammelide, and benzoguanamine. Maximum adsorption occurred at pH levels in the vicinity of the pK A of each compound. The amount of adsorption which resulted was related to the substituent groups on the triazine ring. Comparisons of compounds substituted in the 2‐position indicated that adsorption of the s ‐triazines by montmorillonite decreased in the order: ‐SC 2 H 5 > ‐SCH 3 > ‐OCH 3 > OH > ‐Cl. Substitutions made in the 4 and 6 positions indicated that dialkylamino compounds were adsorbed in greater amounts than monoalkyl substituted compounds and that adsorption decreased in the order: C 4 H 9 (t) > C 4 H 9 (s) > C 2 H 5 > C 3 H 7 (i) > CH 3 > C(CH 3 ) 2 CN. The more basic compounds were adsorbed in greater amounts than compounds of lower basicity.