This work investigated the fate of nicotine (Nico) in aqueous solution upon reaction with singlet oxygen (O-1(2)) and hydroxyl radical (HO.). The second-order rate constants of Nico Nico, with O-1(2) (k(Nico,) (1)(O2)= (3.38 +/- 0.14) x 10(6) M-1 s(-1) )and HO (k(Nico),(.)(OH) = (1.08 +/- 0.10) x 10(9)M(-1) s(-1)) were determined using competition kinetics. Photochemical modelling showed that the reaction of Nico with HO. would prevail over that with 102 in surface waters transformation pathway. The Nico photochemical half-life time could be accounted for by the two reactions. This value would vary in the month-year range depending on the environmental conditions: phototransformation would be favoured in shallow water poor in organic matter and rich in nitrate and nitrite. Irradiation experiments of Nico with nitrite suggested that transformation could not be accounted for by HO. reaction alone. Indeed, a variable fraction of Nico transformation (30-80% depending on the conditions) would take place upon reaction with additional transients, photogenerated NOx being possible candidates. The chemical structures of the transformation intermediates were derived by means of HPLC-MS. The detection of nitroderivatives upon irradiation of Nico with nitrite suggests the involvement of nitrogen dioxide in the relevant photoprocesses.

Photoenhanced Transformation of Nicotine in Aquatic Environments: Involvement of Naturally Occurring Radical Sources.

M. Passananti;VIONE, Davide Vittorio;
2014-01-01

Abstract

This work investigated the fate of nicotine (Nico) in aqueous solution upon reaction with singlet oxygen (O-1(2)) and hydroxyl radical (HO.). The second-order rate constants of Nico Nico, with O-1(2) (k(Nico,) (1)(O2)= (3.38 +/- 0.14) x 10(6) M-1 s(-1) )and HO (k(Nico),(.)(OH) = (1.08 +/- 0.10) x 10(9)M(-1) s(-1)) were determined using competition kinetics. Photochemical modelling showed that the reaction of Nico with HO. would prevail over that with 102 in surface waters transformation pathway. The Nico photochemical half-life time could be accounted for by the two reactions. This value would vary in the month-year range depending on the environmental conditions: phototransformation would be favoured in shallow water poor in organic matter and rich in nitrate and nitrite. Irradiation experiments of Nico with nitrite suggested that transformation could not be accounted for by HO. reaction alone. Indeed, a variable fraction of Nico transformation (30-80% depending on the conditions) would take place upon reaction with additional transients, photogenerated NOx being possible candidates. The chemical structures of the transformation intermediates were derived by means of HPLC-MS. The detection of nitroderivatives upon irradiation of Nico with nitrite suggests the involvement of nitrogen dioxide in the relevant photoprocesses.
2014
55
106
114
Hydroxyl radical; Environmental fate; Surface water; Modelled half-life time; Nitrogen-centred radicals
M. Passananti; F. Temussi; M. R. Iesce; L. Previtera; G. Mailhot; D. Vione; M. Brigante.
File in questo prodotto:
File Dimensione Formato  
Wat_Res_2014_nicotine.pdf

Open Access dal 17/02/2016

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 1.47 MB
Formato Adobe PDF
1.47 MB Adobe PDF Visualizza/Apri
WR2014_nico.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 1.98 MB
Formato Adobe PDF
1.98 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/155201
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 27
social impact