Kinetics of the chemical degradation of diuron

Salvestrini, Stefano; Cerbo, Paola Di; Capasso, Sante

doi:10.1016/s0045-6535(02)00043-7

Cited by 64 publications

(31 citation statements)

References 11 publications

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“…This proposed degradation pathway was consistent with previous work [15,46]. In any case, aniline, typical degradation product which has been proposed as the main phenylurea chemical degradation intermediate [47,48] was not detected, possibly because they were easily degraded by the OH • radicals, as demonstrated previously [49], and could not be found in a sufficient concentration to be detected.…”

Section: Identification Of Photoproducts and Degradation Mechanismsupporting

confidence: 91%

Photocatalytic degradation of diuron in aqueous solution by platinized TiO2

Katsumata

Sada

Nakaoka

et al. 2009

Journal of Hazardous Materials

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Section: Identification Of Photoproducts and Degradation Mechanismsupporting

confidence: 91%

Photocatalytic degradation of diuron in aqueous solution by platinized TiO2

Katsumata

Sada

Nakaoka

et al. 2009

Journal of Hazardous Materials

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“…Diuron is stable toward hydrolysis under neutral conditions but at lower and higher pH values the hydrolysis rate sharply increases (12,24). Enhanced NDMA formation at pH 4 may therefore be attributed to the greater availability of DMA un this condition.…”

Section: Resultsmentioning

confidence: 97%

“…The concentration observed was usually above 1 µg/L (6), which is the concentration of acute toxicity (the concentration exhibiting effects on 50% of test organisms from a single exposure in a short space of time) for algae (11), and some of the observations exceeded 10 µg/L (6). Diuron's wide occurrence in water results from its high use and combination of moderate aqueous solubility (42 mg/L at 20 o C), low Henry's law constant (0.051 mPa·m 3 /mol), low to moderate hydrophobicity (log K OW = 2.6), modest sorption coefficient (K OC ~ 500 L/kg), slow hydrolysis under neutral conditions (10), negligible photolytic breakdown, and limited biotransformation, which primarily involves N-demethylation reactions (12,13). 2 Diuron is of concern in drinking water supplies for two main reasons.…”

Section: Introduction and Problem Statementmentioning

confidence: 99%

NDMA Formation during Chlorination and Chloramination of Aqueous Diuron Solutions

Chen

Young

2008

Environ. Sci. Technol.

122

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Formation of the potent carcinogen N-nitrosodimethylamine (NDMA) during chlorine disinfection of water containing secondary amines is now generally acknowledged. The phenylurea herbicide diuron is one of the most widely used herbicides in California, has been frequently detected in California's water sources with a transient nature of appearance, and has a structure that suggests it might be an NDMA precursor. This study sought to quantify the potential for NDMA formation from aqueous diuron solutions under varied chlorine and chloramine conditions. NDMA formation was consistently observed even in the absence of added ammonia, which has usually been the source of the nitroso-nitrogen during chloramination of other precursors. It appears that both nitrogen atoms in NDMA are donated by diuron during chlorination in the absence of added ammonia. For a given chlorine and diuron dose, NDMA formation increased in the order OCl -

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“…2,3 Seagrasses and adult corals 4 can be affected by diuron concentrations as low as 0.1 μg L -1 . Diuron is stable against hydrolysis (at neutral pH and room temperature) and sunlight, 5 although it hydrolyzes at acid or alkaline pH; 3,4-dichloroaniline is the main product, 6 which is highly toxic. 7 It is also degraded photochemically 8,9 and by ozonation.…”

Section: Introductionmentioning

confidence: 99%

FI-photoinduced Chemiluminescence Method for Diuron Determination in Water Samples

2011

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A new method for the determination of the herbicide diuron, using a flow injection manifold and photoinduced chemiluminescence detection, is presented. The pesticide, in basic medium, was irradiated on-line with UV light (254 nm) for 53 s. A short discussion about the possible irradiation products is included. The chemiluminescent response of the photoproducts was induced by oxidation with potassium ferricyanide in phosphate buffer at pH 11.5. The method permitted the quantification of diuron over the 0.1 -4.0 mg L -1 range, with a detection limit (S/N = 3) of 20 μg L -1 when the method was applied directly. However, the use of solid phase extraction (SPE) performed with C18 cartridges allowed us to achieve a limit of detection of 0.4 μg L -1 and a 1.5 -30 μg L -1 dynamic range. The method was successfully applied to the diuron determination in samples of water from different sources (spring, ground, mineral, irrigation, sea and tap waters) with a low consumption of reagents.

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Kinetics of the chemical degradation of diuron

Cited by 64 publications

References 11 publications

Photocatalytic degradation of diuron in aqueous solution by platinized TiO2

Photocatalytic degradation of diuron in aqueous solution by platinized TiO2

NDMA Formation during Chlorination and Chloramination of Aqueous Diuron Solutions

FI-photoinduced Chemiluminescence Method for Diuron Determination in Water Samples

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