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Hydrolysis of Atrazine on Soil Colloids

Published online by Cambridge University Press:  12 June 2017

H. D. Skipper ,
V. V. Volk ,
M. M. Mortland  and
K. V. Raman
H. D. Skipper
Affiliation:
Dep. Agron. and Soils, Clemson Univ., Clemson, SC 29631
V. V. Volk
Affiliation:
Dep. Soil Sci., Oregon State Univ., Corvallis, OR 97331
M. M. Mortland
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48823
K. V. Raman
Affiliation:
Dep. Soil Sci., U.P.A.U. Pantnagar, Nainital, India
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Abstract

Infrared spectroscopy was used to study the hydrolysis of atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] upon interaction with homoionic soil colloids. Montmorillonite, an allophanic soil clay, and a montmorillonitic Coker soil clay were saturated with H+, Al3+, Cu2+, and Ca2+ and treated with atrazine and hydroxyatrazine [2-hydroxy-4-(ethylamino)-6-(isopropylamino)-s-triazine]. Hydrolysis of atrazine was evaluated by the presence of a strong hydroxyatrazine carbonyl absorption band at 1745 cm-1. The H+- and Al3+-saturated montmorillonite and montmorillonitic Coker soil clay promoted atrazine hydrolysis while Ca2+- or Cu2+-saturated montmorillonite did not. A small degree of atrazine hydrolysis was detected in the Cu2+-Coker soil clay. Dehydration of Ca2+- or Cu2+-Coker soil clay after equilibration with atrazine increased the hydrolysis of atrazine. The allophanic soil clay did not catalyze the hydrolysis of atrazine when the exchange complex was saturated with H+, Al3+, Ca2+, or Cu2+. Moreover, Al3+-allophane was not sufficiently acidic to protonate hydroxyatrazine. Thus, a major difference exists between soil allophanic colloids, montmorillonitic soil clays, and montmorillonite as catalysts in the protonation and hydrolysis of atrazine.

Type
Research Article
Information
Weed Science , Volume 26 , Issue 1 , January 1978 , pp. 46 - 51
Copyright
Copyright © 1978 by the Weed Science Society of America 

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