Photodegradation of Selected Organophosphorus Insecticides Under Sunlight in Different Natural Waters and Soils

Sakellarides, T. M.; Siskos, Michael G.; Albanis, Triantafyllos A.

doi:10.1080/0306731031000104227

Cited by 61 publications

(48 citation statements)

References 38 publications

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“…In the presence of light and TiO 2 , the loss of triazophos was approximately ten times faster than that observed in the absence of TiO 2 . The difference in the rate may be due to the production of oxidants by the irradiated TiO 2 catalyst [11,[15][16]. To assess the reproducibility of the method, experiments were repeated three times.…”

Section: Kinetic Studiesmentioning

confidence: 99%

“…Furthermore, it can lead to complete mineralization [7][8][9], thereby eliminating potential effects associated with toxic intermediates. Although there have been reports on degradation of pesticides [8][9][10][11][12][13] in polluted waters, the efficiency of the process is heavily dependent on the chemical nature of the pesticides being treated. The present work aims to study the kinetics, to identify intermediates and to propose degradation mechanism of photocatalytic degradation of triazophos using simulated solar radiation.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

Aungpradit

Sutthivaiyakit

Martens

et al. 2007

Journal of Hazardous Materials

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Section: Kinetic Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

Aungpradit

Sutthivaiyakit

Martens

et al. 2007

Journal of Hazardous Materials

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“…The hydrolysis of OPs, whether as agricultural agents or as weapons, to less harmful compounds is thus an important aspect for environmental decontamination. The phosphate ester bond is prone to cleavage, mostly by hydrolysis, but photolytic degradation by sunlight is also possible [5].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Daumann

Larrabee

Ollis

et al. 2014

Journal of Inorganic Biochemistry

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Annually thousands of people die or suffer from organophosphate (pesticide) poisoning. In order to remove these toxic compounds from the environment, the use of enzymes as bioremediators has been proposed. We report here a Ser127Ala mutant based on the enzyme glycerophosphodiesterase (GpdQ) from Enterobacter aerogenes. The mutant, with improved metal binding abilities, has been immobilized using glutaraldehyde on PAMAM dendrimer-modified magnetite nanoparticles. The immobilized system was characterized using elemental analysis as well as infrared, transmission electron and X-ray photoelectron spectroscopies. The amount of GpdQ that was immobilized with the optimized procedure was 1.488 nmol per g MNP. A kinetic assay has been designed to evaluate the activity of the system towards organophosphoester substrates. The specific activity towards BPNPP directly after immobilization was 3.55 μmol mg -1 min -1 , after one week 3.39 μmol mg -1 min -1 and after 120 days 3.36 μmol mg -1 min -1 , demonstrating that the immobilized enzyme was active for multiple cycles and could be stored on the nanoparticles for a prolonged period.3

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“…Photodegradation studies have been carried out on FEN (Greenhalgh and Marshall 1976;Lacorte and Barcelo 1994;Sakellarides et al 2003;Amano et al 2002;Fukushima and Katagi 2006;Druzina and Stegu 2007;Weber et al 2009a) and DIA (Dennis et al 1979;Young and Chang 1998;Daneshvar et al 2007), although results show a wide variation in degradation rates and half-lives between natural and laboratorycomposite waters (Barcelo and Hennion 1997). This may be attributable to the various light sources used (e.g.…”

Section: Introductionmentioning

confidence: 98%

Effects of Dissolved Water Constituents on the Photodegradation of Fenitrothion and Diazinon

Ukpebor

Halsall

2011

Water Air Soil Pollut

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The photochemical degradation of two widely used organophosphorothioate insecticides, fenitrothion and diazinon, was investigated in aqueous solutions containing three separate dissolved constituents commonly found in natural waters (NO 3 − , CO 3 2− and dissolved organic matter (DOC)). The effect of these constituents on pesticide photodegradation was compared to degradation in "constituent-free" pure water. Solutions were irradiated in an Atlas solar simulator fitted with a UV-filtered Xenon arc lamp with light irradiances (500 W m −2 ) measured using a spectral radiometer to allow derivation of quantum yields of degradation. Fenitrothion absorbs light within the solar UV range (λ, 295-400 nm) and underwent direct photolysis in pure water whereas diazinon (λ max ∼250 nm) showed no observable loss over the experimental period. However, photodegradation conforming to pseudo-first-order kinetics was observed for both chemicals in the presence of the dissolved constituents (at concentrations typically observed in natural waters), with the rates of photodecay observed in the order of NO 3 − >CO 3 2− ≅DOC, with the highest rates observed in the 3 mM NO 3 − solutions (k Fen = 0.155±0.041 h −1 ; k Dia =0.084±0.0007 h −1 ). For diazinon this rate was comparable to fenitrothion photolysis in pure water (k fen 0.072±0.0078 h −1 ), highlighting the importance of NO 3 − on a non-photolabile pesticide, with indirect photodegradation probably attributable to the light-induced release of aqueous hydroxyl radicals ( · OH) from NO 3 − . Suwannee river fulvic acid (serving as DOC) did not statistically affect the rate of photodecay for fenitrothion relative to its photolysis in MilliQ water, although measured rates in DOC solutions were slightly lower. However, measurable rates of photodecay were apparent for diazinon in the DOC solutions, indicating that fulvic acid, possibly in the form of "excited" triplet-state-DOC plays a role in diazinon transformation. Hydrolysis was not apparent for fenitrothion (in buffered solutions of pH 5-9) but was notable for diazinon at the lower pHs of 5 and 3 (k Dia-hyd 0.3414 h −1 at pH 3 and 0.228 h −1 at pH 5), resulting in the formation of the degradate, 2-isopropyl-6-methyl-4-pyrimidinol. This work highlights the importance of dissolved constituents on abiotic photodegradation of pesticides and it is recommended that these constituents be incorporated into laboratory-based fate-testing regimes.

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Photodegradation of Selected Organophosphorus Insecticides Under Sunlight in Different Natural Waters and Soils

Cited by 61 publications

References 38 publications

Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

Photocatalytic degradation of triazophos in aqueous titanium dioxide suspension: Identification of intermediates and degradation pathways

Immobilization of the enzyme GpdQ on magnetite nanoparticles for organophosphate pesticide bioremediation

Effects of Dissolved Water Constituents on the Photodegradation of Fenitrothion and Diazinon

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