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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2007, Volume 58, Issue 2,





On the Mechanism of Dichlorvos Hydrolysis

Abstract:

The hydrolysis of Dichlorvos (DDVP) in aqueous solutions of different pH0 resulting from H2SO4 or NaOH addition was studied. Our experiments demonstrated that the acid-catalyzed reaction of dichloracetaldehyde (DCA), one of the hydrolysis products, superposed on the base-catalyzed DDVP hydrolysis. The presence of Cl- ions measured in solutions supports this assumption. The bond order calculations of the parent DDVP molecule, as well as of dichlorvinylmethyl phosphoric acid (DVMP) and of dimethyl phosphoric acid (DMP), its hydrolysis products, offer a theoretical agreement with the hydrolysis mechanism. The absence of PO4-3 in solution suggests that monomethyl phosphoric acid (MMP), is the final reaction product. A pseudo first order kinetic was determined for DDVP hydrolysis, and the total rate constant kI was calculated for each sample with different initial pH. An optimum was found at pH 6 regarding the variation of DpH, DE and kI with the initial solution pH value according to the suggested mechanism. Keywords: dichlorvos, pesticides, hydrolysis, bond order


Issue: 2007, Volume 58, Issue 2
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