Journal
ENVIRONMENTAL CHEMISTRY LETTERS
Volume 1, Issue 1, Pages 68-72Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10311-002-0010-7
Keywords
Carbendazim; Hydroxyl radical; Carbonate radical; Transformation; Kinetic modelling
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The transformation of the fungicide carbendazim (methyl-2 benzimidazole carbamate) induced by hydroxyl radical generated by the UV photolysis of H2O2 has been studied in dilute aqueous solution. The efficient reaction of hydroxyl radicals with carbendazim led to the rapid degradation of carbendazim. The study of reaction kinetics yielded a second order rate constant of 2.2+/-0.3 10(9) M-1 s(-1) for HO center dot radicals with carbendazim. This value is in agreement with a high reactivity of HO center dot radicals with carbendazim. Most degradation products were identified by high performance liquid chromatography mass spectrometry (HPLC-MS). In the presence of hydrogenocarbonate and carbonate ions, hydroxyl radicals were quenched and in turn carbonate radicals CO3 center dot- were formed. Carbonate radicals are indeed known to react efficiently with compounds containing electron-rich sites such as nitrogen or sulfur atoms. The use of a kinetic modelling software gave evidence for the occurrence of such reactions with carbendazim. The second order rate constant of carbonate radical with carbendazim was equal to 6+/-2 10(6) M-1 s(-1).
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