Photodegradation of the Herbicides Butachlor and Ronstar Using Natural Sunlight and Diethylamine

Lin, Yaw-Jian; Lin, C.; Yeh, K. J.; Lee, A.

doi:10.1007/s001280000071

Cited by 21 publications

(13 citation statements)

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“…In addition, the sorption of the herbicide in the suspended sediments can reduce the degradation rates of oxadiazon in the soil (Lin et al, 2000;Ying & Williams, 2000), forming carboxylic acid, phenolic derivatives and polar dealkylated products, which were identified as the metabolites of degradation of oxadiazon in the soil (Ying & Williams, 1999).…”

Section: Resultsmentioning

confidence: 99%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

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-The objective of this study was to evaluate oxadiazon sorption in different soils of the Brazilian Cerrado, highlighting the correlations of lethal doses of this herbicide capable of inhibiting 50% of the dry matter accumulation of the bio-indicator (LD50) among the chemical characteristics of the soil and its direct and indirect effects. The experiment was carried out in a greenhouse in a randomized block design and four repetitions. Each experimental unit consisted of a pot with increasing rates of oxadiazon and oat (Avena sativa), as the bio-indicator species. For sorption evaluation, washed sand and 22 soils (substrates) from Cerrado Brazilian's Alliaceae cultivated areas were used. LD50 and sorption ratio (SR) = [(LD50soil -LD50sand)/ LD50sand] to the substrates were determined. Pearson correlation analysis was performed between the chemical characteristics of the substrates and the LD50 of oxadiazon. A path analysis was quantified, to deploy only the significant correlations estimated in direct and indirect effects of the characters on LD50, which is a basic variable. A more pronounced LD50 (528.09 g ha -1 ) for the Cerrado soil sample resulted in higher SR (> 53.00), while in the washed sand substrate, LD50 corresponded only to 9.74 g ha -1 of the oxadiazon (available in soil). It was concluded that oxadiazon sorption is influenced by the chemical characteristics of the soils, highlighting the correlation with pH (CaCl 2 ), magnesium content, aluminum, organic matter, organic carbon, and aluminum saturation.Keywords: bioassay, neutral herbicide, organic matter. RESUMO -Objetivou-se neste estudo avaliar a sorção do oxadiazon em diferentes solos do Cerrado Brasileiro, destacando as correlações da dose letal do herbicida capaz de inibir 50% do acúmulo da massa seca do bioindicador (DL50) entre as características químicas do solo e seus efeitos diretos e indiretos. O experimento foi realizado em casa de vegetação, com delineamento em blocos casualizados com quatro repetições. Cada unidade experimental foi constituída de um vaso com doses crescentes do oxadiazon; utilizou-se a aveia (Avena

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Section: Resultsmentioning

confidence: 99%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

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“…The estimated DT50 of butachlor in paddy water during 21 days after herbicide application were 6.0 days for treatment and 46.5 days for control, respectively. The butachlor were very sensitive to sunlight that the half-life of butachlor was about 5.4 hr in aqueous solution (Chen and Chen, 1979) and 58.2 ± 4.5 hr in filtered river water under sunlight (Lin et al, 2000).…”

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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“…During UV-DEA applications, it was also found that evaporation was especially effective in removal of light compounds from the sludge (Salihoglu et al, 2012;Karaca and Tasdemir, 2011;Karaca, 2013). In previous studies, DEA was used as an additive in photodegradation of PCBs (Lin et al, 2000(Lin et al, , 2004. In the study performed by Lin et al (2004), it was suggested that the PCBs turn into low chlorine PCBs via radicals of DEA and de-chlorination reactions.…”

Section: Uv-dea Applicationsmentioning

confidence: 99%

Migration of polycyclic aromatic hydrocarbons (PAHs) in urban treatment sludge to the air during PAH removal applications

Karaca

Cindoruk

Taşdemir

2013

Journal of the Air & Waste Management Association

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In the present study, the amounts of polycylic aromatic hydrocarbons (PAHs) penetrating into air during PAH removal applications from the urban treatment sludge were investigated. The effects of the temperature, photocatalyst type, and dose on the PAH removal efficiencies and PAH evaporation were explained. The sludge samples were taken from an urban wastewater treatment plant located in the city of Bursa, with 585,000 equivalent population. The ultraviolet C (UV-C) light of 254 nm wavelength was used within the UV applications performed on a specially designed setup. Internal air of the setup was vacuumed through polyurethane foam (PUF) columns in order to collect the evaporated PAHs from the sludge during the PAH removal applications. All experiments were performed with three repetitions. The PAH concentrations were measured by gas chromatography-mass spectrometry (GC-MS). It was observed that the amounts of PAHs penetrating into the air were increased with increase of temperature, and more than 80% of PAHs migrated to the air consisted of 3-ring compounds during the UV and UV-diethylamine (DEA) experiments at 38 and 53 degrees C. It was determined that 40% decrease was ensured in sigma12 (total of 12) PAH amounts with UV application and 13% of PAHs in sludge penetrated into the air. In the UV-TiO2 applications, a maximum 80% of sigma12 PAH removal was obtained by adding 0.5% TiO2 of dry weight of sludge. The quantity of PAH penetrating into air did not exceed 15%. UV-TiO2 applications ensured high levels of PAH removal in the sludge and also reduced the quantity of PAH penetrating into the air. Within the scope of the samples added with DEA, there was no increase in PAH removal efficiencies and the penetration of PAHs into air was not decreased. In light of these data, it was concluded that UV-TiO2 application is the most suitable PAH removal alternative that restricts the convection of PAH pollution.

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Photodegradation of the Herbicides Butachlor and Ronstar Using Natural Sunlight and Diethylamine

Cited by 21 publications

References 0 publications

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

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

Migration of polycyclic aromatic hydrocarbons (PAHs) in urban treatment sludge to the air during PAH removal applications

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