Irradiation-wavelength dependent photochemistry of the bichromophoric sulfonylurea chlorsulfuron

Caselli, Monica; Ponterini, Glauco; Vignali, Moris

doi:10.1016/s1010-6030(00)00392-0

Cited by 18 publications

(17 citation statements)

References 23 publications

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“…The kinetic studies clearly showed that at pH 7 the photodegradation becomes an important pathway when compared to chemical transformations. Similar cleavage of the sulfonyl urea bridge was also obtained when the herbicides tribenuron methyl and chlorsulfuron were irradiated in different solvents [31,32]. Recently, we reported on the induced degradation of metsulfuron methyl by excitation of iron(III) aquacomplexes [33].…”

Section: Introductionsupporting

confidence: 64%

Degradation of metsulfuron methyl by heterogeneous photocatalysis on TiO2 in aqueous suspensions: Kinetic and analytical studies

Rafqah

Wong-Wah-Chung

Aamili

et al. 2005

Journal of Molecular Catalysis A: Chemical

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Section: Introductionsupporting

confidence: 64%

Degradation of metsulfuron methyl by heterogeneous photocatalysis on TiO2 in aqueous suspensions: Kinetic and analytical studies

Rafqah

Wong-Wah-Chung

Aamili

et al. 2005

Journal of Molecular Catalysis A: Chemical

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“…The photodegradation of chlorsulfuron was previously studied by some authors (Coly and Aaron 1999a, b, 2000Caselli et al 2001;Maurino et al 1999); to the authors' knowledge, however, neither the substrate nor its reaction products have to date been determined using a chemiluminescent reaction.…”

Section: Influence Of the Reaction Medium On The Photodegradation Of mentioning

confidence: 99%

“…Interest in this topic has been aroused by the fact that light constitutes a straightforward, clean, economic, reproducible means for the in situ control of various pollutants (Caselli, Ponterini, and Vignali 2001;Maurino et al 1999).…”

Section: Introductionmentioning

confidence: 99%

A Fully Automated Assembly Using Solenoid Valves for the Photodegradation and Chemiluminometric Determination of the Herbicide Chlorsulfuron

2005

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This paper presents a new photochemiluminescent system for the determination of chlorsulfuron in water samples. The light from a low-pressure mercury lamp is used as a clean, reproducible, and inexpensive "reagent" for the derivation of the pesticide, performed in glycine buffer at pH 9.5. Then, the photo-products from irradiation are oxidized by permanganate in sulfuric acid solution. The oxidation reaction was favored by using high temperatures. A comparative study and discussion about the use of polyphosphoric acid instead of sulfuric acid in the oxidation reaction is also presented.The use of solenoid valves allows for the easy, complete automation of the process with low sample and reagent consumption. The calibration graph was linear over the range 0.1-1.3 mg L 21 of chlorsulfuron, the limit of detection was 0.06 mg L 21 , and the throughput was 25 h 21 . The proposed method was applied to the determination of the pesticide in spiked mineral water samples.

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“…The effect of oxygen on the photolysis rate and product distribution together with the LFP study indicated the involvement of both S* and T* in the aqueous photolysis of chlorsulfuron at 280 nm, and either homolytic or heterolytic C-Cl bond cleavage was proposed. 39) Reductive dechlorination was predominant for propanil, 131) fenhexamid, 132) and norflurazon, 133) and photo-induced substitution was additionally observed for metconazole. 4) Incidentally, chloroacetanilide herbicides, such as alachlor, 134) metolachlor, 135) and propisochlor, 136) generally produced hydroxymethylcarbonyl derivatives by photonucleophilic substitution.…”

Section: Dehalogenation 3151 Dechlorinationmentioning

confidence: 99%

Direct photolysis mechanism of pesticides in water

Katagi

2018

Journal of Pesticide Science

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Photodegradation is one of the most important abiotic transformations for pesticides in the aquatic environment, and the high energy of sunlight causes characteristic reactions such as bond scission, cyclization, and rearrangement, which are scarcely observed in hydrolysis and microbial degradation. This review deals with direct photolysis via excitation of a pesticide by absorbing natural or artificial sunlight in order to know its basic photochemistry, and indirect photolysis meaning either sensitization by dissolved organic matters or oxidation by reactive oxygen species is basically excluded. Several experimental approaches including spectroscopic techniques together with theoretical calculations are first discussed from the viewpoint of the reaction mechanisms in direct photolysis. Then, the typical photoreactions of pesticides are summarized by chemical classes and/or functional groups and discussed as far as possible in relation to their mechanisms.

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Irradiation-wavelength dependent photochemistry of the bichromophoric sulfonylurea chlorsulfuron

Cited by 18 publications

References 23 publications

Degradation of metsulfuron methyl by heterogeneous photocatalysis on TiO2 in aqueous suspensions: Kinetic and analytical studies

Degradation of metsulfuron methyl by heterogeneous photocatalysis on TiO2 in aqueous suspensions: Kinetic and analytical studies

A Fully Automated Assembly Using Solenoid Valves for the Photodegradation and Chemiluminometric Determination of the Herbicide Chlorsulfuron

Direct photolysis mechanism of pesticides in water

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