Laboratory studies on the kinetics of degradation in aqueous solution of Phosalone and Myclobutanil (organic pesticides) were carried out in alkaline conditions (pH 10, 11, 12) and at various temperatures (20, 30, 40 +/- 1 degreesC) in order to assess the persistence of these compounds, which are highly toxic for aquatic fauna, in the above specified conditions. The rate of hydrolysis and kinetic constants for the degradation reactions of both compounds were determined with a view to ascertaining the applicability of alkaline hydrolysis treatment to wastewater from factories producing plant-protection products. A first-order kinetics for hydrolytic degradation was verified within the pH range considered for both compounds and a half-life of about two hours was already observed at pH = 11 for Phosalone, while for Myclobutanil only a slow degradation occurred in alkaline conditions.
Kinetics of hydrolysis of two selected pesticides in alkaline conditions / Merli, Carlo; DI PALMA, Luca; Petrucci, Elisabetta; Fausto, Trasarti. - STAMPA. - (2000), pp. 245-250. (Intervento presentato al convegno 2nd International Conference on Remediation of Chlorinated and Recalcitrant Compounds tenutosi a MONTEREY, CA nel MAY 22-25, 2000).
Kinetics of hydrolysis of two selected pesticides in alkaline conditions
MERLI, Carlo;DI PALMA, Luca;PETRUCCI, Elisabetta;
2000
Abstract
Laboratory studies on the kinetics of degradation in aqueous solution of Phosalone and Myclobutanil (organic pesticides) were carried out in alkaline conditions (pH 10, 11, 12) and at various temperatures (20, 30, 40 +/- 1 degreesC) in order to assess the persistence of these compounds, which are highly toxic for aquatic fauna, in the above specified conditions. The rate of hydrolysis and kinetic constants for the degradation reactions of both compounds were determined with a view to ascertaining the applicability of alkaline hydrolysis treatment to wastewater from factories producing plant-protection products. A first-order kinetics for hydrolytic degradation was verified within the pH range considered for both compounds and a half-life of about two hours was already observed at pH = 11 for Phosalone, while for Myclobutanil only a slow degradation occurred in alkaline conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
