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Direct photolysis of benzoylecgonine under UV irradiation at 254nm in a continuous flow microcapillary array photoreactor

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journal contribution
posted on 15.10.2015, 12:32 authored by Danilo Russo, Danilo Spasiano, Marianna Vaccaro, Roberto Andreozzi, Gianluca Li-PumaGianluca Li-Puma, Nuno Reis, Raffaele Marotta
Benzoylecgonine (BE) is the major metabolite of cocaine and a contaminant of emerging concern often detected in sewage treatment plant (STP) effluents and surface waters. In this study, an innovative microcapillary film (MCF) array photoreactor made of fluoropolymer material was used to determine the direct photolysis quantum yield of benzoylecgonine at 254 nm. The quantum yield of BE was found to be (6.22 ± 0.19) × 10-3 mol ein-1. The proposed methodology was validated by estimating the quantum yield of caffeine (7.48 10-4 ± 0.64) × 10-4 mol ein-1, which was found in agreement with results published in literature. The MCF uses a very small sample volume (in the order of 330μl per meter length of material) and allows extremely rapid photolysis with a short contact time ranging from a fraction of seconds to a few minutes. This new microfluidics approach presented in this study is particularly useful for determining the photochemical behavior of highly priced pharmaceuticals, illicit drugs, metabolites and uncommon or regulated substances.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Chemical Engineering

Published in

Chemical Engineering Journal




243 - 250


RUSSO, D. al., 2015. Direct photolysis of benzoylecgonine under UV irradiation at 254nm in a continuous flow microcapillary array photoreactor. Chemical Engineering Journal, 283, pp. 243-250.


© Elsevier


AM (Accepted Manuscript)

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This paper was accepted for publication in the journal Chemical Engineering Journal and the definitive published version is available at: