Effects of selected metal ions on photodegradation of organophosphorus pesticides sensitized by humic acids

Kamiya, Mamoru; Kameyama, Katsura

doi:10.1016/s0045-6535(00)00573-7

Cited by 47 publications

(32 citation statements)

References 12 publications

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“…The 1,2,4-triazoles are being widely used as pharmaceutical and as agricultural chemicals (Haasnoot, 2000). There has also been considerable research on complexation of pesticides with metal ions since it influences their pharmacological and toxicological properties (Arion et al, 2003;Zhang et al, 2003;Kamiya & Kameyama, 2001;Morillo et al, 2002).…”

Section: Methodsmentioning

confidence: 99%

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Dichloridotetrakis(1H-1,2,4-triazole-κN⁴)copper(II)

et al. 2012

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The central CuIIatom of the molecular title complex, [CuCl2(C2H3N3)4], is situated on a site with symmetry 2.22. It is six-coordinated in an elongated octahedral geometry, with the equatorial plane defined by four N atoms of four 1,2,4-triazole ligands and the axial positions occupied by two Cl atoms situated on a twofold axis. The molecules are connectedviaN—H...Cl hydrogen bonds and the crystal consists of two interpenetrating three-dimensional hydrogen-bonded frameworks.

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Section: Methodsmentioning

confidence: 99%

“…For the synthesis and structure of 1,2,4-triazole with other metal ions, see: Arion et al (2003), Haasnoot (2000). For properties of some Cu II complexes of pesticides, see: Kamiya & Kameyama (2001); Morillo et al (2002).…”

Section: Related Literaturementioning

confidence: 99%

Dichloridotetrakis(1H-1,2,4-triazole-κN⁴)copper(II)

et al. 2012

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“…The photochemical effects of humic substances on the degradation of organophosphorus pesticides in aqueous systems were studied with respect to (1) photo-induced radical generation abilities of humic substances and (2) the change of the humic-sensitized photodegradation rate constants relative to those measured in the humic-less system [62]. The sensitization action of humic acids was found to rely on the binding affinities of pesticides to the radical generation source of humic acids, as the affinities may hinder the pesticide photodegradation in humic-less aquatic systems possibly initiated by any route other than the radical mechanism.…”

Section: Photosensitized Induced Processmentioning

confidence: 99%

A review of photochemical approaches for the treatment of a wide range of pesticides

Reddy

Kim

2015

Journal of Hazardous Materials

162

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“…Cu 2þ chelation exerted typically inhibition effect on the direct photolysis of OTC, and completely quenched the fluorescence emission of OTC. In the literature, Cu 2þ is able to stabilize some other organic compounds as imazamox and organophosphorus pesticides against the photodegradation (Kamiya and Kameyama, 2001;Quivet et al, 2006), and to quench the fluorescence emission of aquatic humic and fulvic substance (David K. Ryan et al, 2011, Frimmel andHopp, 1986). The environmental fate of compounds, including OTC, by Cu 2þ chelation was quite different to Ca 2þ and Mg 2þ which were studied to promote TCs photodegradation Werner et al, 2006), and enhanced the fluorescence emission of TC congeners Schneider et al, 2003).…”

Section: Binding Sites Of Cu 2þ With Otcmentioning

confidence: 99%

The effect of Cu2+ chelation on the direct photolysis of oxytetracycline: A study assisted by spectroscopy analysis and DFT calculation

Jin

Qiu

et al. 2016

Environmental Pollution

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Chelation Direct photolysis TD-DFT a b s t r a c tThe extensive usage of OTC and Cu 2þ in livestock and poultry industry caused high residues in natural environment. Co-contamination of OTC and Cu 2þ was a considerable environmental problem in surface waters. In this study, Cu 2þ mediated direct photolysis of OTC was studied. Cu 2þ chelating with OTC was found to greatly inhibit OTC photodegradation. To reveal the chelation mechanism of OTC-Cu complexes, multiple methods including UVeVis absorption spectra, Infrared (IR) spectra, mass spectroscopy, and density functional theoretical (DFT) modeling were performed. Four OTC-Cu complexes were proposed. Cu 2þ preferably bond to O 11 eO 12 site with the binding constants logK ¼ 8.19 and 7.86 for CuHLþ and CuL±, respectively. The second chelating site was suggested to be O2eO3 with the binding constants of logK ¼ 4.41 and 4.62 for Cu2HL3þ and Cu2L2þ, respectively. The suppressed quantum yield of OTC by Cu2þ chelation was accused for their intra-/inter-molecular electron transfer, by which the energy in activated states was distributed. The occurrence of electron transfer between BCD ring and A ring also from BCD ring to Cu was evidenced by the TD-DFT result only for the OTC-Cu complexes. Besides, the cyclic voltammetry measurement also suggested one OTC-Cu(II)/OTC-Cu(I) redox couple. These results suggested that the persistence of OTC in environmental surface waters will probably be underestimated for neglecting the chelating effect of Cu2þ. The photolysis quantum yield of OTC-Cu complexes, as well as the specific molar absorption constants, the equilibrium binding constants of Cu2þ with OTC could contribute to more accurate kinetic models of OTC.

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Effects of selected metal ions on photodegradation of organophosphorus pesticides sensitized by humic acids

Cited by 47 publications

References 12 publications

Dichloridotetrakis(1H-1,2,4-triazole-κN⁴)copper(II)

Dichloridotetrakis(1H-1,2,4-triazole-κN⁴)copper(II)

A review of photochemical approaches for the treatment of a wide range of pesticides

The effect of Cu2+ chelation on the direct photolysis of oxytetracycline: A study assisted by spectroscopy analysis and DFT calculation

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Effects of selected metal ions on photodegradation of organophosphorus pesticides sensitized by humic acids

Cited by 47 publications

References 12 publications

Dichloridotetrakis(1H-1,2,4-triazole-κN4)copper(II)

Dichloridotetrakis(1H-1,2,4-triazole-κN4)copper(II)

A review of photochemical approaches for the treatment of a wide range of pesticides

The effect of Cu2+ chelation on the direct photolysis of oxytetracycline: A study assisted by spectroscopy analysis and DFT calculation

Contact Info

Product

Resources

About

Dichloridotetrakis(1H-1,2,4-triazole-κN⁴)copper(II)

Dichloridotetrakis(1H-1,2,4-triazole-κN⁴)copper(II)