Oxidation of selected organophosphate pesticides during chlorination of simulated drinking water

Kamel, Amr; Byrne, Christian; Vigo, Craig; Ferrario, Joseph; Stafford, Charles J.; Verdin, Gregory; Siegelman, Frederic; Knizner, Steven; Hetrick, J. A.

doi:10.1016/j.watres.2008.10.038

Cited by 66 publications

(43 citation statements)

References 13 publications

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“…The molecular ion of m/z 213 tended to yield the m/z 156 ion by the migration of hydrogen to the phosphoryl oxygen accompanied by the loss of the neutral N-methyl isocyanate, and the m/z 110 ion through a-cleavage accompanied by the rearrangement of hydrogen. OMT was formed because organophosphorus pesticides containing a P = S bond could be oxidized to their corresponding oxons (with P = O) by chlorination (Duirk and Collette, 2006;Kamel et al, 2009;Duirk et al, 2009).…”

Section: Byproducts Formationmentioning

confidence: 99%

“…28% of the degraded DMT, implying that 72% of DMT was degraded through other pathways. Hence, the degradation mechanism of DMT by FC seemed more complicated than that of most organophosphorus pesticides containing the thiophosphate moiety (Duirk and Collette, 2006;Kamel et al, 2009;Duirk et al, 2009). The mass balance on the sulfur atom (i.e., the total S in DMT, OMT, and sulfate) reveals a deficiency of approximately 12% after 1 min chlorination, which means that some organic byproducts containing sulfur were not identified.…”

Section: Byproducts Formationmentioning

confidence: 99%

“…Isoproturon was also found to be degraded by FC Mascolo et al, 2001). Moreover, some organophosphate pesticides have been shown to react with FC to produce stable oxons or other oxidation analogues (Kamel et al, 2009;Duirk et al, 2009). DMT has the potential for exposure in drinking water and reaction with FC, but data for assessing its persistence and toxicity in finished drinking water are lacking.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics and mechanism of dimethoate chlorination during drinking water treatment

et al. 2014

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h i g h l i g h t sThe reaction of DMT with chlorine was of first-order in each reactant. The observed rate constant of DMT degradation was strongly pH dependent. Both bromide and humic acid promoted but ammonium inhibited the degradation of DMT. Three organic byproducts were detected in DMT degradation by chlorine. The toxicity of DMT solution obviously increased after chlorination. a r t i c l e i n f o a b s t r a c t Dimethoate (DMT), a commonly used organophosphorus pesticide, is of great concern because of its toxicity and potentially harmful effects on water sources. The elimination of DMT as well as the toxicity and persistence of the byproducts formed during DMT degradation is most important for the safety of drinking water. This study first determined the reaction kinetics of DMT with free chlorine (FC) under typical water treatment conditions. The reaction between DMT and FC proceeded rapidly, exhibiting first-order with respect to each reactant. The degradation of DMT by FC was highly pH dependent, and the pseudofirst-order rate constant decreased obviously from 0.13 to 0.02 s À1 with an increase in pH from 7.0 to 8.3. Bromide ion accelerated the reaction by acting as a catalyst, and the accelerated reaction rate was linearly proportional to the bromide concentration. As a ubiquitous component in natural waters, humic acid also increased the reaction rate. However, the presence of ammonium inhibited the degradation of DMT due to its rapid converting FC to chloramines. Omethoate (OMT) was identified as an important byproduct of DMT chlorination, but only accounted for ca. 28% of the DMT degraded; and other two organic byproducts were also identified. The acute toxicity of DMT solution increased after treatment with FC due to the formation of more toxic byproducts (e.g. OMT).

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Section: Byproducts Formationmentioning

confidence: 99%

Section: Byproducts Formationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics and mechanism of dimethoate chlorination during drinking water treatment

et al. 2014

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“…No estudo de Ormad et al (2008), utilizou-se o hipoclorito de sódio com concentração ativa de cloro de 18 mg.L -1 e tempo de contato de 20 min, chegando a 100,0% de remoção. Kamel et al (2009) …”

Section: Tratamento De Ciclo Completo -Etapas De Clarificaçãounclassified

Remoção dos agrotóxicos incluídos na portaria 2914/2011 em ETAs.

Pereira¹,

Pereira²,

Bottrel³

2018

RDAE

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ResumoDe acordo com as modificações verificadas entre a Portaria 518/2004 e a 2914/2011, escolheram-se onze agrotóxicos que foram acrescentados a esta para a realização de uma revisão bibliográfica sobre a remoção dos mesmos nos processos de tratamento de água. Verificou-se que as etapas do tratamento de ciclo completo não ofereceram elevadas remoções, com exceção de um composto. Para tecnologias como a radiação UV, ozonização e POAs, muitos estudos chegaram próximos a 100,0% de remoção, porém alguns tratamentos utilizam tempos de contato inviáveis. Os processos de adsorção mostraram-se eficientes quando aliados a outras tecnologias, e poucos estudos foram encontrados sobre nanofiltração. Verificou-se a necessidade de estudos sobre a formação de produtos tóxicos e com relação à remoção de alguns compostos nas diferentes etapas de tratamento de uma ETA. Palavras-chave: Agrotóxicos. Remoção. Tecnologias de tratamento. 518/2004 and 2914/2011, eleven Abstract According to changes verified between decrees

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“…Disulfoton is widely used against aphids, mites, and thrips. There are numerous reports on analysis of disulfoton [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], but the majority of these studies detail environmental safety tests [1][2][3]5,6,13], food analysis [4,7,8,14] and ingestion toxicity tests in rodents [1,13,14] or report on concerning the inhalation exposure in humans [1,13]. Although some poisoning cases caused by disulfoton ingestion were reported [10,12], there has been only one report in English in the literature on toxicological analysis of disulfoton in a fatality [11].…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of disulfoton and its oxidative metabolites in human whole blood and urine using QuEChERS extraction and liquid chromatography–tandem mass spectrometry

Usui

Hayashizaki

Minagawa³

et al. 2012

Legal Medicine

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Oxidation of selected organophosphate pesticides during chlorination of simulated drinking water

Cited by 66 publications

References 13 publications

Kinetics and mechanism of dimethoate chlorination during drinking water treatment

Kinetics and mechanism of dimethoate chlorination during drinking water treatment

Remoção dos agrotóxicos incluídos na portaria 2914/2011 em ETAs.

Rapid determination of disulfoton and its oxidative metabolites in human whole blood and urine using QuEChERS extraction and liquid chromatography–tandem mass spectrometry

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