Photochemical Behavior of the Insecticide Methomyl Under Different Conditions

Tomašević, Anđelka; Mijin, Dušan Ž.; Kiss, Ernő E.

doi:10.1080/01496395.2010.487720

Cited by 29 publications

(39 citation statements)

References 41 publications

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“…The results (Table 2) showed that the degradation of methomyl was much faster with ZnO than with TiO 2 . The IC results confirmed that mineralization of methomyl led to the formation of sulfate, nitrate, and ammonium ions during the all investigated processes (Tomašević et al, 2010a(Tomašević et al, , 2010bTomašević, 2011). (Tomašević, 2011 Fig.…”

Section: Methomylsupporting

confidence: 64%

“…4), reaction temperature and pH. The photocatalytic removal of the methomyl from aqueous solutions upon UV/Vis (366 and 300-400 nm) and natural solar light in the presence of TiO 2 and ZnO has been examined (Tomašević et al, 2009b(Tomašević et al, , 2010aTomašević, 2011) and the influence of reaction conditions (initial concentration of methomyl, catalysts type and concentration, pH, presence of Clions) were studied. The results (Table 2) showed that the degradation of methomyl was much faster with ZnO than with TiO 2 .…”

Section: Methomylmentioning

confidence: 99%

“…2. The photolysis of 16.22 mg/L of methomyl in different types of water (deionized, disstiled and sea water) at 254 nm was performed (Tomašević et al, 2009c(Tomašević et al, , 2010aTomašević, 2011) and the influence of reaction parameters to degradation of pesticide were investigated. The studies showed that the photolysis reactions depend on the lamp distance (Fig.…”

Section: Methomylmentioning

confidence: 99%

“…The photo-Fenton was more efficient than Fenton, both for methomyl degradation and TOC removal. The catalytic wet peroxide oxidation of methomyl at 575.6 nm (photo-Fenton reaction) with two types of heterogeneous iron catalysts (Fe-ZSM-5 zeolite and AlFe-pillared montmorillonite) were performed (Lazar et al, 2009;Tomašević et al, 2007cTomašević et al, , 2009cTomašević et al, , 2010aTomašević et al, , 2010bTomašević, 2011). The effect of catalyst type on the reaction is shown in Fig.…”

Section: Methomylmentioning

confidence: 99%

See 3 more Smart Citations

Photoremediation of Carbamate Residues in Water

Tomašević¹,

Gašić²

2012

Insecticides - Basic and Other Applications

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Section: Methomylsupporting

confidence: 64%

Section: Methomylmentioning

confidence: 99%

Section: Methomylmentioning

confidence: 99%

Section: Methomylmentioning

confidence: 99%

See 2 more Smart Citations

Photoremediation of Carbamate Residues in Water

Tomašević¹,

Gašić²

2012

Insecticides - Basic and Other Applications

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“…Direct photolysis is negligible because methomyl's molar extinction coef fi cient is low for wavelengths higher than 290 nm (Tamimi et al 2006 ) ; the wavelength spectrum for methomyl in aqueous solution is in the range of 200-300 nm, whereas the solar spectrum ranges from 300 to 600 nm (Malato et al 2002 ) . Tomasevic et al ( 2010 ) investigated the in fl uence of water quality on photolytic degradation (at 254 nm) and found that the t 1/2 of technical grade methomyl in distilled water (79.7 min; pH 5.5) was lower than that in either seawater (123 min; pH 7.9) or deionized water (97.6 min; pH 5.2). Furthermore, degradation appears to be governed by pseudo-fi rst order kinetics, whether alone or in the presence of photosensitizers such as TiO 2 or ZnO (ZnO proved to be a better catalyst; Tomasevic et al 2010 ) .…”

Section: Photolysismentioning

confidence: 99%

Environmental Fate and Toxicology of Methomyl

Scoy

Yue

Deng

et al. 2012

Reviews of Environmental Contamination and Toxicology

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The insecticide methomyl, an oxime carbamate, was first introduced in 1968 for broad spectrum control of several insect classes, including Lepidoptera, Hemiptera, Homoptera, Diptera, and Coleoptera. Like other carbamates, it inhibits AChE activity, resulting in nerve and/or tissue failure and possibly death. Considered highly toxic to insects (larval and adult stages), methomyl is thought to be metabolically degraded via mixed-function oxidase(s). Methomyl has both a low vapor pressure and Henry's law constant; hence, volatilization is not a major dissipation route from either water or moist or dry soils. Photolysis represents a minor dissipation pathway; however, under catalytic conditions, degradation via photolysis does occur. Methomyl possesses a moderate-to-high water solubility; thus hydrolysis, under alkaline conditions, represents a major degradation pathway. Methomyl has a low-to-moderate sorption capacity to soil. Although results may vary with soil type and organic matter content, methomyl is unlikely to persist in complex soils. Methomyl is more rapidly degraded by microbes, and bacterial species have been identified that are capable of using methomyl as a carbon and/or nitrogen source. The main degradation products of methomyl from both abiotic and biotic processes are methomyl oxime, acetonitrile, and CO₂. Methomyl is moderately to highly toxic to fishes and very highly toxic to aquatic invertebrates. Methomyl is highly toxic orally to birds and mammals. Methomyl is classed as being highly toxic to humans via oral exposures, moderately toxic via inhalation, and slightly toxic via dermal exposure. At relatively high doses, it can be fatal to humans. Although methomyl has been widely used to treat field crops and has high water solubility, it has only infrequently been detected as a contaminant of water bodies in the USA. It is classified as a restricted-use insecticide because of its toxicity to multiple nontarget species. To prevent nontarget species toxicity or the possibility of contamination, as with all pesticides, great care should be taken when applying methomyl-containing products for agricultural, residential, or other uses.

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A case study of methomyl removal from aqueous solutions by four natural Albanian clays

Xhaxhiu

Prifti

Zítka

2020

Remediation Journal

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This study evaluated the adsorption properties of four Albanian natural clays from the regions of Brari, Currila, Dardha, and Prrenjasi for commercial methomyl from aqueous solutions. Three methomyl concentrations, 0.200, 0.400, and 0.600 mg/ml, were tested at 25°C to study the influence of the insecticide concentration on the adsorption process for each natural clay type. Within 48 hr of contact time, the adsorption pathways of methomyl on the selected clays are well described by a Langmuir‐like adsorption kinetic model and an intraparticle diffusion model. Hydrolysis and desorption inhibit the overall removal process. The increase of methomyl concentration in solution within the first 48 hr leads to linear adsorption increases well described by Langmuir and Freundlich adsorption isotherms and disfavors the desorption step for the Brari, Currila, and Dardha clays. For the methomyl concentration of 0.600 mg/ml, within 24 hr of contact time, the Dardha and Prrenjasi clays reveal 1.471 and 1.956 mg/g methomyl uptake, respectively. The Brari and Currila clays show longer saturation times followed by better methomyl retention. The Dardha and Prrenjasi clays exhibit fast and high adsorption combined with low retention times.

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Photochemical Behavior of the Insecticide Methomyl Under Different Conditions

Cited by 29 publications

References 41 publications

Photoremediation of Carbamate Residues in Water

Photoremediation of Carbamate Residues in Water

Environmental Fate and Toxicology of Methomyl

A case study of methomyl removal from aqueous solutions by four natural Albanian clays

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