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Isoconversional kinetic study of alachlor and metolachlor vaporization by thermal analysis

✍ Scribed by Nicolas Sbirrazzuoli; Stefano Vecchio; Alessia Catalani

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
104 KB
Volume
37
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The vaporization kinetics of two acetamide pesticides, namely alachlor and metolachlor, was studied by thermogravimetric analysis under nonisothermal conditions (using heating rates between 1.0 and 10 K min^−1^). A model‐free isoconversional method of kinetic analysis was proposed, and activation energy dependences on the extent of conversion α for nonisothermal experiments were given. An increase in activation energy is shown for alachlor from 50 to 60 kJ mol^−1^, while E values do not significantly vary in the range α > 0.1: 63 kJ mol^−1^ for metolachlor while 60 kJ mol^−1^ for alachlor. At the end of vaporization (0.9 < α < 1.0), the activation energies are in close agreement with the enthalpies of vaporization calculated from DSC measurements. © 2004 Wiley Periodicals, Inc. Int J Chem Kinet 37: 74–80, 2005

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