Organophosphorus pesticide ozonation and formation of oxon intermediates

Wu, Jiguo; Lan, C. Y.; Chan, Yuk Sing Gilbert

doi:10.1016/j.chemosphere.2009.04.060

Cited by 94 publications

(49 citation statements)

References 36 publications

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“…Organophosphorus pesticides (OPPs) are commonly used to control pests on cotton, rice, sorghum, sugarcane and vegetables, generally acting as cholinesterase inhibitors (Wu et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

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Kinetics and mechanism for omethoate degradation by catalytic ozonation with Fe(III)-loaded activated carbon in water

2013

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“…Organophosphorus pesticides (OPPs) are commonly used to control pests on cotton, rice, sorghum, sugarcane and vegetables, generally acting as cholinesterase inhibitors (Wu et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

“…Even worse, many of these byproducts are more toxic than their parent forms (Wu et al, 2009). For example, dimethoate could be oxidized to OMT, which is about 10 times as toxic as dimethoate.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism for omethoate degradation by catalytic ozonation with Fe(III)-loaded activated carbon in water

2013

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“…Photolysis [7,8], photocatalysis [9][10][11], the Fenton and photoFenton processes [12,13], and ozone based oxidation [14,15] for OPPs degradation were investigated in recent years. Among the different AOP technologies, ozone is capable of oxidizing a variety of organic and inorganic compounds in aqueous solution, either by direct reaction of molecular ozone, or through a radical mechanism involving the hydroxyl radical [16].…”

Section: Introductionmentioning

confidence: 99%

“…Radicals are unstable and reactive, because one of their electrons is unpaired. On the other hand, ozone alone is insufficient to achieve a complete mineralization of OPPs [14]. Besides, disappearance of parent compounds does not always indicate the successful treatment, because the degraded products may be more toxic than the parent compounds.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Malathion and Parathion by Ozonation, Photolytic Ozonation, and Heterogeneous Catalytic Ozonation Processes

Bedük

Aydın

Özcan

2011

CLEAN Soil Air Water

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The oxidation of organophosphorus pesticides (OPPs), such as malathion and parathion, in aqueous solution was studied using conventional ozonation (O 3 ), photolytic ozonation (O 3 /UV, O 3 /UV/H 2 O 2 ), and heterogeneous catalytic ozonation (O 3 /TiO 2 /UV) processes. Experiments were performed in batch mode at laboratory scale and processes were compared in terms of disappearance kinetics. The best results of pesticide mineralization were obtained when TiO 2 particles in combination with ozone (O 3 ) and UV photolysis (l ¼ 254 nm) were applied. Decomposition of 99% of parent compounds were achieved in 10 min and oxon derivatives were completely removed in 30 min. The initial reaction rate increases linearly with increasing catalyst amount. Toxicity measurements of the treated solutions were carried out in order to evaluate the efficiency of the treatment methods. No detoxification was achieved for O 3 and O 3 /UV applications. Heterogeneous photocatalytic ozonation was shown to be feasible for achieving complete decomposition of OPPs and their oxon intermediates.

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“…Insecticides -when seeds (soft wheat, maize, dry wheat) were fenvalerate, methomyl, deltamethrin and fenitrothion contaminated and O 3 treated (10-180 min, at 5-125 mg/l and 20-100 l/h flow) had quite effective reduction (up to 99%) [49][50][51][52]. Insecticides O 3 gas treated could be effectively reduced and degraded into non toxic by-products, especially for the rat liver functional interlinks [53,54]. Herbicides -when bromoxinile and trifluralin were O 3 treated at doses ranging from 80 to 480 μM (10 min), the gas was able to significantly react with bromoxynil, achieving degradation of 98% (after 2 min), however trifluralin was less O 3 reactive, reaching only half (50%) of its degradation after 5 min [55].…”

Section: Toxic Compounds Combinedmentioning

confidence: 99%

Effectiveness of Ozone Gas Application Methods against Combined Multi-Contaminants in Food

Christ¹,

Savi²,

Scussel³

2017

fph

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Despite the ozone (known as GRAS -generally recognized as safe) gas treatments published for each food living organism or chemical decontamination, they are not necessarily present or contaminate food individually. Most of the time, they are present all together. Therefore, the most important point, regarding an O 3 application method to be chosen is its effectiveness to all contaminants that may be in the target food. Therefore, ozone gas decontamination methods that gather combined multi-contaminants and their effectiveness in food were surveyed. Both, for inactivation of living organisms (insects, mites, fungi, yeasts and bacteria) and degradation of toxic compounds (pesticides and mycotoxins). They are the main need for an effective and comprehensive commercial decontamination application. This review brings details on O 3 formation energy sources, its application conditions (concentration / time of exposure), container characteristics (volume / material type / sealed or hermetic) and effectiveness for different food (type / contamination level / batch size/moisture content). From the studies and data reported, ozone has shown to be an efficient green agent for combined multi-decontamination, thus prolonging the food storage and shelf life. It does not cause/produce adverse effects on food quality.

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Organophosphorus pesticide ozonation and formation of oxon intermediates

Cited by 94 publications

References 36 publications

Kinetics and mechanism for omethoate degradation by catalytic ozonation with Fe(III)-loaded activated carbon in water

Kinetics and mechanism for omethoate degradation by catalytic ozonation with Fe(III)-loaded activated carbon in water

Degradation of Malathion and Parathion by Ozonation, Photolytic Ozonation, and Heterogeneous Catalytic Ozonation Processes

Effectiveness of Ozone Gas Application Methods against Combined Multi-Contaminants in Food

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