title: Photooxidation of herbicide amitrole in the presence of fulvic acid.
abstract: Fulvic acid (Henan ChangSheng Corporation) photoinduced degradation of non-UVA-absorbing herbicide amitrole (3-amino-1,2,4-triazole, AMT) as a way for its removal from polluted water was investigated in details. It was shown that the main primary species generated by fulvic acid under UVA radiation, triplet state and hydrated electron, are not directly involved in the herbicide degradation. AMT decays in reactions with secondary intermediates, reactive oxygen species, formed in reactions of the primary ones with dissolved oxygen. Singlet oxygen is responsible for 80% of herbicide oxidation, and•OH and O2-•radicals-for the remaining 20% of AMT. It was found that quantum yield of AMT photodegradation (ϕ365nm) decreases linearly from 2.2 × 10-3to 1.2 × 10-3with the increase of fulvic acid concentration from 1.1 to 30 mg L-1. On the contrary, the increase of AMT concentration from 0.8 to 25 mg L-1leads to practically linear growth of ϕ365nmvalue from 1.8 × 10-4to 4 × 10-3. Thus, the fulvic acid exhibits a good potential as UVA photooxidizer of organic pollutants sensitive to the singlet oxygen (ϕ532nm(1O2) = 0.025 at pH 6.5).
authors.affiliation: V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090. pozdnyak@kinetics.nsc.ru.|Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090. pozdnyak@kinetics.nsc.ru.
authors.forename: Ivan P
authors.initials: IP
authors.lastname: Pozdnyakov
authors.affiliation: Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090.|International Tomography Center, 3a Institutskaya str, Novosibirsk, Russian Federation, 630090.
authors.forename: Peter S
authors.initials: PS
authors.lastname: Sherin
authors.affiliation: V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090.
authors.forename: Victoria A
authors.initials: VA
authors.lastname: Salomatova
authors.affiliation: B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 220072, Minsk, Belarus.
authors.forename: Marina V
authors.initials: MV
authors.lastname: Parkhats
authors.affiliation: V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090.|Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090.
authors.forename: Vjacheslav P
authors.initials: VP
authors.lastname: Grivin
authors.affiliation: B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 220072, Minsk, Belarus.
authors.forename: Boris M
authors.initials: BM
authors.lastname: Dzhagarov
authors.affiliation: V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090.
authors.forename: Nikolai M
authors.initials: NM
authors.lastname: Bazhin
authors.affiliation: V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090.|Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090.
authors.forename: Victor F
authors.initials: VF
authors.lastname: Plyusnin
mesh_terms: D000640:Amitrole / Q000737:chemistry*; D001578:Benzopyrans / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010782:Photolysis; D026082:Singlet Oxygen / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: D001578:Benzopyrans; D004785:Environmental Pollutants; D006540:Herbicides; D014230:Triazoles; D026082:Singlet Oxygen; D010100:Oxygen; C005023:fulvic acid; D000640:Amitrole
keywords: Amitrole; Fulvic acids; Herbicides; Photooxidation; Reactive oxygen species