Photolysis and hydrolysis of rimsulfuron

Scrano, Laura; Bufo, Sabino Aurelio; Perucci, P.; Meallier, P.; Mansour, Mohammed

doi:10.1002/(sici)1096-9063(199909)55:9<955::aid-ps29>3.3.co;2-0

Cited by 18 publications

(29 citation statements)

References 9 publications

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“…Hydrolysis and photolysis reactions occurred simultaneously during irradiation. Therefore, the photolysis contribution was calculated by adding the quantity ( C 0 − C ) dark , which dissipated in a certain time in the dark, to the remaining ( C ) light concentration detected in the irradiated solution at the same time, where C 0 represents the initial concentration of the herbicide and C represents the concentration at a certain time 10. Data were processed using MassLynx (version 3.4) software.…”

Section: Methodsmentioning

confidence: 99%

Hydrolysis and photolysis of flumioxazin in aqueous buffer solutions

Kwon

Armbrust

Grey

2004

Pest Management Science

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To determine the degradation rates and degradation products of the herbicide flumioxazin in aqueous buffer solutions (pH 5, 7 and 9), its hydrolysis and photolysis were investigated at 30 degrees C in the dark, and in a growth chamber fitted with fluorescent lamps simulating the UV output of sunlight. The rate of hydrolysis of flumioxazin was accelerated by increasing pH. The t(1/2) values at pH 5, 7 and 9 were 16.4, 9.1 and 0.25 h, respectively. Two degradation products were detected and their structural assignments were made on the basis of LC-MS data. Degradation product I was detected in all buffer solutions while degradation product II was detected in acidic buffer only. Both degradation products appeared to be stable to further hydrolysis. After correcting for the effects of hydrolysis, the photolytic degradation rate also increased as a function of pH and was approximately 10 times higher at pH 7 than that at pH 5, showing t(1/2) values of 4.9 and 41.5 h, respectively. Degradation products formed by photolysis were the same as those formed by hydrolysis. Flumioxazin was degraded more extensively at high pH and should degrade in surface water.

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Section: Methodsmentioning

confidence: 99%

Hydrolysis and photolysis of flumioxazin in aqueous buffer solutions

Kwon

Armbrust

Grey

2004

Pest Management Science

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“…Sulfonylurea herbicides provide good crop selectivity; with very low application rates and favorable environmental and toxicological properties (Beyer et al, 1988;Scrano et al, 1999;Sarmah & Sabadie, 2002). Sulfonylurea herbicides are characterized by their low vapor pressure, high water solubility (200 g L À1 for metsulfuron-methyl), and high phytotoxicity.…”

Section: Introductionmentioning

confidence: 99%

“…The photolysis of sulfonylurea herbicides under artificial radiation sources is known to follow first-order kinetics (Beyer et al, 1988;Pusino et al, 1999;Scrano et al, 1999). However, mass spectrometry studies of the photolysis under natural sunlight have been limited and not widely reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Mass spectrometry of the photolysis of sulfonylurea herbicides in prairie waters

Headley

Peru

et al. 2009

Mass Spectrometry Reviews

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This review of mass spectrometry of sulfonylurea herbicides includes a focus on studies relevant to Canadian Prairie waters. Emphasis is given to data gaps in the literature for the rates of photolysis of selected sulfonylurea herbicides in different water matrices. Specifically, results are evaluated for positive ion electrospray tandem mass spectrometry with liquid chromatography separation for the study of the photolysis of chlorsulfuron, tribenuron-methyl, thifensulfuron-methyl, metsulfuron-methyl, and ethametsulfuron-methyl. LC-MS/MS is shown to be the method of choice for the quantification of sulfonylurea herbicides with instrumental detection limits ranging from 1.3 to 7.2 pg (on-column). Tandem mass spectrometry coupled with the use of authentic standards likewise has proven to be well suited for the identification of transformation products. To date, however, the power of time-of-flight MS and ultrahigh resolution MS has not been exploited fully for the identification of unknown photolysis products. Dissipation of the herbicides under natural sunlight fit pseudo-first-order kinetics with half-life values ranging from 4.4 to 99 days. For simulated sunlight, radiation wavelengths shorter than 400 nm are required to induce significant photolytic reactions. The correlation between field dissipation studies and laboratory photolysis experiments suggests that photolysis is a major pathway for the dissipation of some sulfonylurea herbicides in natural Prairie waters.

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“…In addition, the photochemical behavior of sulfonylurea herbicides depends on the pH (Vulliet et al, 2004). Scrano et al (1999) reported the whole reaction (photolysis + hydrolysis) under sunlight is faster in acidic and alkaline conditions than in neutral solutions. The pH value was in neutral range of 7.4 and 7.6 for treatment and control in this study.…”

Section: Resultsmentioning

confidence: 99%

Photodegradation of Butachlor and Pyrazosulfuron-ethyl in Rice Paddy Water under Natural Sunlight

Watanabe

Cho

et al. 2014

Korean Journal of Environmental Agriculture

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BACKGROUND: Dissipation of herbicides in paddy water varies significantly, being dependent on environmental conditions such as sunlight. The photodegradation under natural sunlight may be one of natural degradation routes of herbicides dissipation. Therefore, the aim of this study was to monitor the degradation of butachlor and pyrazosulfuronethyl in paddy water under natural sunlight. METHODS AND RESULTS:The 12 water sample bottles of treatment were covered by quart glass plates, which allow about 90% of UV radiation (280-2000 nm) to pass through, to minimize the UV attenuation. The other 12 water sample bottles of the control were covered by glass lids and wrapped with aluminum foils to prevent the sunlight. The concentration of butachlor and pyrazosulfuronethyl in paddy water samples bottles was monitored under ambient conditions with and without natural sunlight. The concentration of butachlor and pyrazosulfuron-ethyl for treatment decreased from 355.3 μg/L to 37.8 μg/L and from 10.5 μg/L to 3.9 μg/L, respectively, during consecutive 21 days after herbicide application under natural sunlight. CONCLUSION: The concentration of butachlor in paddy

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Photolysis and hydrolysis of rimsulfuron

Cited by 18 publications

References 9 publications

Hydrolysis and photolysis of flumioxazin in aqueous buffer solutions

Hydrolysis and photolysis of flumioxazin in aqueous buffer solutions

Mass spectrometry of the photolysis of sulfonylurea herbicides in prairie waters

Photodegradation of Butachlor and Pyrazosulfuron-ethyl in Rice Paddy Water under Natural Sunlight

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