Photodegradation of the herbicide Norflurazon sensitised by Riboflavin. A kinetic and mechanistic study

Chemosphere
Walter A MassadNorman A García

Abstract

The kinetics and mechanism of the Riboflavin (Rf)-promoted photochemical degradation with visible light of the herbicide Norflurazon (NF) has been studied by time-resolved and stationary techniques. Using light of wavelength higher than 400 nm--a region where NF is totally transparent--and with concentrations of Rf and NF of ca. 0.02 and 1 mM, respectively, only the excited triplet state of Rf ((3)Rf*) is quenched by NF, in competition with dissolved ground state triplet oxygen, O(2)((3)Sigma(g)(-)). NF degradation mainly occurs by reaction with superoxide radical anion O(2)(-) formed through two electron transfer steps: from NF to (3)Rf*, yielding Rf radical anion, and from this anion to O(2)((3)Sigma(g)(-)), regenerating ground state Rf. Although singlet molecular oxygen is also produced, NF only quenches this oxidative species in a physical mode. The global result is the photoprotection of the sensitiser and the photodegradation of NF.

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Citations

Nov 2, 2011·Chemical Reviews·M Luisa MarinMiguel A Miranda
May 20, 2011·Environmental Science & Technology·Christina K Remucal, Kristopher McNeill
Jun 17, 2014·Journal of Agricultural and Food Chemistry·Hossein HammamiHoriyeh Nassirli
Nov 13, 2008·Photodermatology, Photoimmunology & Photomedicine·Eram Husain, Imrana Naseem
Jul 22, 2014·Photochemistry and Photobiology·Chengying LuMinghua Wang
Nov 18, 2005·Chemosphere·Xueheng ZhaoHuey-Min Hwang
Jun 24, 2014·Journal of Dairy Science·María L BoieroMariana A Montenegro
Nov 15, 2007·Journal of Environmental Science and Health. Part C, Environmental Carcinogenesis & Ecotoxicology Reviews·Huey-Min HwangXueheng Zhao
Aug 14, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Zhangyu ZhengMinghua Wang
Nov 8, 2018·Photochemistry and Photobiology·Eduardo GaticaWalter A Massad

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