EFFECT OF ZN(II) ON ACID HYDROLYSIS OF METHYLPARATHION
ABSTRACT Methylparathion (O,O,-dimethyl O-4 nitrophenylphosphorotioate) kinetic transformation in presence of Zn(II) was studied at pH range from 2 to 7. Between pH 2-5 methylparathion degraded, but at pH 6 and 7 Zn(II) precipitated and the pesticide hydrolysis did not occur. The reaction was first order and the rate constant values were 3.38 x 10-2 h-1 (pH 2), 7.69 x 10-3 h-1 (pH 3), 1.31 x 10-2 h-1 (pH 4) and 1.02 x 10-2 h-1 (pH 5). Paranitrophenol appeared as the only electroactive product at all pH values. It is proposed that the main degradation pathway for methylparathion in acid medium was a hydrolysis reaction of the pesticide catalyzed by Zn(II), via an electrophilic mechanism.
Saved in:
Main Authors: | Manzanilla-Cano,José A., Barceló-Quintal,Manuel H., Rendón-Osorio,Reyna B., Flores-Rodríguez,Julio |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Universidad Nacional Autónoma de México, Centro de Ciencias de la Atmósfera
2006
|
Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0188-49992006000100021 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Titrimetric and Polarographic Determination of Carminic Acid and its Quantification in Cochineal (Dactylopius coccus) Extracts
by: Reyes-Salas,Octavio, et al.
Published: (2011) -
Direct electroanalytical determination of methylparathion in solution extracted from soil.
by: SIMOES, F. R., et al.
Published: (2009-05-13) -
Ethanol from waste of pruning by acid hydrolysis and enzymatic hydrolysis
by: Tejeda, Lesly, et al.
Published: (2011) -
Electroanalytical procedure for the determination of methylparathion in soil suspensions and its application for sorption studies with Brazilian soils
by: Castanho,Giuliane M., et al.
Published: (2003) -
Effect of dilute sulfuric acid pretreatment on the enzymatic hydrolysis of panicum maximum
by: crcastillos@unal.edu.co, Carlos Carlos, et al.
Published: (2018)