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- W2011783550 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." @default.
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- W2011783550 date "2004-11-01" @default.
- W2011783550 modified "2023-10-16" @default.
- W2011783550 title "Photodegradation of the herbicide Norflurazon sensitised by Riboflavin. A kinetic and mechanistic study" @default.
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- W2011783550 doi "https://doi.org/10.1016/j.chemosphere.2004.06.021" @default.
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