Photocatalytic degradation of pesticides and bio‐molecules in water

Muszkat, Lea; Feigelson, L.; Bir, L.; Muszkat, K. A.

doi:10.1002/ps.578

Cited by 26 publications

(13 citation statements)

References 15 publications

(21 reference statements)

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“…In the present study, the dissipation of metribuzin from the water layer was faster than reported elsewhere. One possible explanation for this could be differences in photolysis, because this process is reported to be important for the dissipation of metribuzin (Muszkat et al 1998(Muszkat et al , 2002.…”

Section: Exposure Concentrationsmentioning

confidence: 99%

Ecological Impact in Ditch Mesocosms of Simulated Spray Drift from a Crop Protection Program for Potatoes

Arts

Buijse-Bogdan

Belgers

et al. 2006

Integr Environ Assess Manag

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Outdoor aquatic ditch mesocosms were treated with a range of pesticides to simulate various spray drift rates resulting from a typical crop protection program used in the cultivation of potatoes in The Netherlands. The main experimental aims of the present study were to provide information on the fate and ecological effects of drift of the pesticides into surface water and to evaluate the effectiveness of drift-reduction measures in mitigating risks. The pesticides selected and the dosage, frequency, and timing of application were based on normal agricultural practices in the potato crop. Applications of prosulfocarb, metribuzin (both herbicides), lambda-cyhalothrin (insecticide), chlorothalonil, and fluazinam (both fungicides) were made in the sequence typical of the spray calendar for potatoes. A total of 15 treatments with the various compounds were made by spray application to the water surface at 0.2%, 1%, and 5% of the recommended label rates. Chemical fate and effects on ecosystem function and structure (phytoplankton, zooplankton, chlorophyll-a, macroinvertebrates, macrophytes, breakdown of plant litter) were investigated. To interpret the observed effects, treatment concentrations were also expressed in toxic units (TU), which describe the relative toxicity of the compounds with standard toxicity test organisms (Daphnia and algae). After treatment, each compound disappeared from the water phase within 2 d, with the exception of prosulfocarb, for which 50% dissipation time (DT50) values ranged between 6 and 7 d. At the 5% treatment level, an exposure peak of 0.9 TU algae was observed, which resulted in short-term responses of pH, oxygen, and phytoplankton. At the 5% treatment level, exposure concentrations also exceeded 0.1 TU Daphnia , and this resulted in longterm effects on zooplankton and macroinvertebrates, some of which did not fully recover by the end of the present study. At the 1% treatment level, only slight transient effects were observed on a limited number of zooplankton and macroinvertebrate species and on pH. At the 0.2% level, no consistent treatment-related effects were observed. Most of the observed effects were consistent with the results from higher-tier and mesocosm studies with the individual compounds. Multi and repeated stress played a small role within the applied pesticide package, because of rapid dissipation of most substances and the absence of many simultaneous applications. This suggests that risk assessments based on the individual compounds would in this case have been sufficiently protective for their uses in a crop protection program.

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Section: Exposure Concentrationsmentioning

confidence: 99%

Ecological Impact in Ditch Mesocosms of Simulated Spray Drift from a Crop Protection Program for Potatoes

Arts

Buijse-Bogdan

Belgers

et al. 2006

Integr Environ Assess Manag

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“…CHL and MET possess high mobility in soil and thus have great potential to leach and pollute surface and groundwater [17]. Few studies relating to the degradation of chloridazon and metribuzin in UV and sunlight have been reported recently in the literature [18][19][20]. No major efforts have been made to study the detailed degradation kinetics of these two herbicide derivatives.…”

Section: Introductionmentioning

confidence: 99%

Titanium Dioxide-Mediated Photcatalysed Degradation of Two Herbicide Derivatives Chloridazon and Metribuzin in Aqueous Suspensions

Khan

Mir

Faisal

et al. 2012

International Journal of Chemical Engineering

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The aim of this paper is to find out the optimal degradation condition for two potential environmental pollutants, chloridazon and metribuzin (herbicide derivatives), employing advanced oxidation process using TiO 2 photocatalyst in aqueous suspensions. The degradation/mineralization of the herbicide was monitored by measuring the change in pollutant concentration and depletion in TOC content as a function of time. A detailed degradation kinetics was studied under different conditions such as types of TiO 2 (anatase/anatase-rutile mixture), catalyst concentration, herbicide concentration, initial reaction pH, and in the presence of electron acceptors (hydrogen peroxide, ammonium persulphate, potassium persulphate) in addition to atmospheric oxygen. The photocatalyst, Degussa P25, was found to be more efficient catalyst for the degradation of both herbicides as compared with two other commercially available TiO 2 powders like Hombikat UV100 and PC500. Chloridazon (CHL) was found to degrade more efficiently under acidic condition, whereas metribuzin (MET) degraded faster under alkaline medium. All three electron acceptors tested in this study were found to enhance the degradation rate of both herbicides.

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“…radicals and subsequent oxidation of photo-intermediates by 1 O 2 formed by dye sensitization. 34 The photocatalytic degradation of atrazine by TiO 2 (Degussa-P25 and anatase), ZnO, SrTiO 3 , ZnS, Fe 2 O 3 and FeTiO 3 and by five kinds of environmental particles (sand, soot, dust, volcanic ash and fly ash) was studied. Particle suspensions were irradiated in a sun simulator containing dissolved atrazine.…”

Section: Photodegradation By Photocatalysismentioning

confidence: 99%

Developments in the mechanism of photodegradation of triazine‐based pesticides

Canle

Fernández

Santaballa

2004

J of Physical Organic Chem

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Developments in the mechanisms of the direct, photosensitized and photocatalyzed photodegradation and of photochemically generated hydroxyl radical-based degradation of triazine-based pesticides are reviewed. Recent results are accounted for: steady-state irradiation photoproducts suggest the participation of both singlet and triplet excited states in the direct photodegradation of triazines, their concurrency being confirmed by luminescence studies. Both low-lying excited states have been theoretically characterized. Laser flash photolysis and pulse radiolysis studies evidence the participation of short-lived radical cations and radical anions, in addition to HO .adducts, in the mechanism of photodegradation. E values were estimated for both the triazine (ca. $ 1.1 V vs NHE) and triazinyl radical cation (2.3 AE 0.1 V vs NHE) and also the pK a for the HO . adduct of triazines (ca. $ 11). Subdiffusion control rate constants were measured for the one-electron oxidation of triazines by SO 4 . À and (UO 2 2þ )*, oneelectron reduction by e À aq and HO . addition.

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Photocatalytic degradation of pesticides and bio‐molecules in water

Cited by 26 publications

References 15 publications

Ecological Impact in Ditch Mesocosms of Simulated Spray Drift from a Crop Protection Program for Potatoes

Ecological Impact in Ditch Mesocosms of Simulated Spray Drift from a Crop Protection Program for Potatoes

Titanium Dioxide-Mediated Photcatalysed Degradation of Two Herbicide Derivatives Chloridazon and Metribuzin in Aqueous Suspensions

Developments in the mechanism of photodegradation of triazine‐based pesticides

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