caa a22 4500 463162153 CHVBK 20180406164750.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1007/s10311-006-0072-z doi (NATIONALLICENCE)springer-10.1007/s10311-006-0072-z Photodegradation of atrazine and ametryn with visible light using water soluble porphyrins as sensitizers [Elektronische Daten] [Susana Rebelo, A. Melo, R. Coimbra, M. Azenha, Mariette Pereira, Hugh Burrows, Mohamed Sarakha] The photodegradation of the herbicides atrazine and ametryn with visible light in aerated neutral aqueous solutions and 5, 10, 15, 20-tetrakis (2,6-dichloro-3-sulfophenyl) porphyrin or 5, 10, 15, 20-tetrakis (4-sulfophenyl) porphyrin as sensitizers are reported for the first time. Our findings show that the degradation percentage reached 30% for atrazine and 63% for ametryn. The final photoproducts were characterized as dealkylated s-triazines. Photolysis of the pesticides in the presence of a singlet oxygen quencher showed only a minor contribution of this type of mechanism, while a bimolecular quenching reaction between the triplet state of the sensitizer and the pesticides is excluded by flash photolysis studies. It is proposed that the mechanism may involve the formation of a superoxide radical anion from the triplet state of the sensitizer and molecular oxygen, followed by a radical decomposition pathway. Springer-Verlag, 2006 Porphyrins nationallicence Atrazine nationallicence Ametryn nationallicence Photodegradation nationallicence Visible light nationallicence Oxygen nationallicence Rebelo Susana Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut Melo A. Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut Coimbra R. Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut Azenha M. Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut Pereira Mariette Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut Burrows Hugh Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut Sarakha Mohamed Université Blaise-Pascal, 63177, Clermont Ferrand, Aubière Cedex, France aut Environmental Chemistry Letters Springer-Verlag 5/1(2007-02-01), 29-33 1610-3653 5:1<29 2007 5 10311 https://doi.org/10.1007/s10311-006-0072-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10311-006-0072-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rebelo Susana Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut NATIONALLICENCE 700 1- Melo A. Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut NATIONALLICENCE 700 1- Coimbra R. Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut NATIONALLICENCE 700 1- Azenha M. Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut NATIONALLICENCE 700 1- Pereira Mariette Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut NATIONALLICENCE 700 1- Burrows Hugh Departamento de Química, Universidade de Coimbra, 3004-535, Coimbra, Portugal aut NATIONALLICENCE 700 1- Sarakha Mohamed Université Blaise-Pascal, 63177, Clermont Ferrand, Aubière Cedex, France aut NATIONALLICENCE 773 0- Environmental Chemistry Letters Springer-Verlag 5/1(2007-02-01), 29-33 1610-3653 5:1<29 2007 5 10311 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer