Pesticides removal in the process of drinking water production

Ormad, María P.; Miguel, Natividad; Claver, Ana; Matesanz, José María; Ovelleiro, J.L.

doi:10.1016/j.chemosphere.2007.10.006

Cited by 245 publications

(126 citation statements)

References 20 publications

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“…Oxidizing (hydrogen peroxide, potassium permanganate and sodium hypochlorite) and reducing reagents (sodium metabisulfite) were not more effective than tap water washing; thus, the main mechanism for removing the residues is dissolution and chemical degradation is unappreciable. From the results obtained in this research work and assuming the criterion that a treatment is efficient in degrading pesticides if a removal percentage of above 70 % is obtained (Ormad et al 2008). So it is recommended to use such simple and non-toxic washing treatments to reduce such residues in fruit samples (Krol et al 2000).…”

Section: Resultsmentioning

confidence: 99%

Safety methods for chlorpyrifos removal from date fruits and its relation with sugars, phenolics and antioxidant capacity of fruits

et al. 2012

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The effectiveness of different postharvest wash treatments at two levels (10 and 20 g/l) for different dipping times was determined to remove chlorpyrifos from date fruits treated at concentration of 2 mg/l. The recovered amount of chlorpyrifos was extracted based on the solid phase extraction (SPE) method and then analyzed by gas chromatography with mass spectrometry (GC-MS). The results demonstrate that the removal of chlorpyrifos increased in the order of acetic acid (AA)> citric acid (CA)> hydrogen peroxide (H 2 O 2 )> potassium permanganate (KMnO 4 )> running water (H 2 O), and the percent of pesticide residue on date fruits depended on the concentration of tested washing treatments and dipping time without the formation of the toxic by-product, chlorpyrifos-oxon. Kinetic studies revealed that chlorpyrifos was found to be more easily removable from date fruits treated with the tested chemical solutions with t 1/2 values of 12-29 min compared with roughly 53 min in case of running water. The impact of these washing treatments on quality of date fruits illustrated that all treatments exerted a little negative effect on total sugars content but H 2 O 2 and KMnO4 at level of 2 % had more drastic effect. Whereas, running water, 10 and 20 g/l CA caused significant increases in total phenolic contents, during all the tested contact times compared with control. Except the insignificant effect of KMnO 4 treatments, antioxidant capacity of date fruits tended to increase in all wash treatments, when the contact times were 5 or 15 min.

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Section: Resultsmentioning

confidence: 99%

Safety methods for chlorpyrifos removal from date fruits and its relation with sugars, phenolics and antioxidant capacity of fruits

et al. 2012

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“…Although water treatment processes can sometimes reduce the concentrations of many pesticides (Ormad et al, 2008), the formation of byproducts may increase the toxicity of treated water (Wu and Laird, 2003). Our previous study has found that the toxicity of MC solution increased after ClO 2 treatment (Tian et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Degradation of methiocarb by monochloramine in water treatment: Kinetics and pathways

et al. 2014

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Monochloramine Degradation pathways Kinetic modelingWater treatment a b s t r a c tThe micropollution of drinking water sources with pesticides has become a global concern.This work investigated the degradation of methiocarb (MC), a most commonly-used carbamate pesticide, by monochloramine (NH 2 Cl) under simulated water treatment conditions. Results indicate that the reaction was of first-order in MC and varied orders in NH 2 Cl depending on water pH. The observed rate constant of MC degradation decreased quickly with either a decrease in the molar ratio of chlorine to ammonia (Cl 2 :N) or an increase in water pH. The apparent activation energy of the reaction was determined to be 34 kJ mol À1 . The MC degradation pathways also exhibited a strong pH dependence: at pH 6.5, MC was first oxidized by NH 2 Cl to methiocarb sulfoxide (MCX), and then hydrolyzed to methiocarb sulfoxide phenol (MCXP); while at pH 8.5, MCX, MCXP and methiocarb sulfone phenol (MCNP) were formed successively through either oxidation or hydrolysis reactions.Based on the identified byproducts and their concentrations evolution, the proposed pathways of MC degradation in the presence of NH 2 Cl were further validated through kinetic model simulations. ª

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“…A more complex mixture comprising alachlor, aldrin, atrazine, chlorfenvinphos, chlorpyrifos, pp′-DDD, op′-DDE, op′-DDT, pp′-DDT, dicofol, dieldrin, diuron, endrin, α-HCH, β-HCH, lindane (γ-HCH), δ-HCH, heptachlor, dieldrin, isoproturon, simazine, terbutryn, trifluralin (at 500 ng L −1 ), and other pesticides not included in the 2013/39/EU Di-rective, was effectively removed (90%) combining ozonation and activated-carbon adsorption processes (Ormad et al, 2008). In a work developed by the same group of researchers, testing the same mixture of compounds spiked in natural waters collected from the River Ebro (Spain), O3/H2O2 and O3/TiO2 led to a lower removal than ozonation, but O3/H2O2/TiO2 was the most efficient process (Ormad et al, 2010).…”

Section: Ozonation-based Processesmentioning

confidence: 99%

An overview on the advanced oxidation processes applied for the treatment of water pollutants defined in the recently launched Directive 2013/39/EU

Ribeiro

Nunes

Pereira

et al. 2015

Environment International

851

319

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Environmental pollution is a recognized issue of major concern since a wide range of contaminants has been found in aquatic environment at ng L −1 to μg L −1 levels.In the year 2000, a strategy was defined to identify the priority substances concerning aquatic ecosystems, followed by the definition of environmental quality standards (EQS) in 2008. Recently it was launched the Directive 2013/39/EU that updates the water framework policy highlighting the need to develop new water treatment technologies to deal with such problem. This review summarizes the data published in the last decade regarding the application of advanced oxidation processes (AOPs) to treat priority compounds and certain other pollutants defined in this Directive, excluding the inorganic species (cadmium, lead, mercury, nickel and their derivatives).The Directive 2013/39/EU includes several pesticides

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Pesticides removal in the process of drinking water production

Cited by 245 publications

References 20 publications

Safety methods for chlorpyrifos removal from date fruits and its relation with sugars, phenolics and antioxidant capacity of fruits

Safety methods for chlorpyrifos removal from date fruits and its relation with sugars, phenolics and antioxidant capacity of fruits

Degradation of methiocarb by monochloramine in water treatment: Kinetics and pathways

An overview on the advanced oxidation processes applied for the treatment of water pollutants defined in the recently launched Directive 2013/39/EU

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