Thermal degradation of pesticides under oxidative conditions

Senneca, Osvalda; Scherillo, Fabio; Nunziata, Alfredo

doi:10.1016/j.jaap.2007.01.002

Cited by 37 publications

(19 citation statements)

References 23 publications

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“…Thus, the lower recoveries of heat-sensitive pesticides could result during milling. Some of the pesticides, such as pyrethroids, which are represented by deltamethrin and lambda-cyhalothrin in the present study, have been reported as heat sensitive pesticides (Senneca et al 2007). To study the effect of heat on the recoveries of the incurred pesticides, oat and rye grains were stored at -80 ºC overnight prior to milling.…”

Section: Extraction Efficiency Of Different Particle Sizessupporting

confidence: 49%

Effects of milling on the extraction efficiency of incurred pesticides in cereals

Herrmann

Hajeb

Andersen

et al. 2017

Food Additives & Contaminants: Part A

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This study investigated the effects of particle size and milling temperature on the extraction efficiencies of pesticide residues from cereal flour. Samples of cereal grains (barley, oat, rye and wheat) were milled using a centrifugal mill with four different sieves (0.2, 1.0, 3.0 and 5.0 mm) or a knife mill both at room temperature and after freezing of the grain at -80°C overnight. The incurred pesticides in the test materials were extracted by the QuEChERS method and analysed by LC-MS/MS and GC-MS/MS. The particle size distribution for the milled samples was determined using a vibratory sieve shaker. Based on the pesticide levels recovered from each of the different millings and the corresponding particle size distributions, it was confirmed that smaller average particle sizes increase the extraction efficiency up to 31%, with all other factors equal. The cereals milled at room temperature produced lower pesticide extraction efficiencies compared with cereals milled when still frozen, especially for heat-sensitive pesticides. Furthermore, milling frozen grains was easier and resulted in more homogeneous samples with smaller relative particle sizes.

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Section: Extraction Efficiency Of Different Particle Sizessupporting

confidence: 49%

Effects of milling on the extraction efficiency of incurred pesticides in cereals

Herrmann

Hajeb

Andersen

et al. 2017

Food Additives & Contaminants: Part A

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show abstract

“…Pyrethroids transform by isomerization, ester cleavage and primary oxidation of the final products [16,17]. Organophosphates, e.g.…”

Section: Introductionmentioning

confidence: 99%

Degradation of insecticides used for indoor spraying in malaria control and possible solutions

Sibanda

Focke

Labuschagne

et al. 2011

Malar J

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BackgroundThe insecticide dichloro-diphenyl-trichloroethane (DDT) is widely used in indoor residual spraying (IRS) for malaria control owing to its longer residual efficacy in the field compared to other World Health Organization (WHO) alternatives. Suitable stabilization to render these alternative insecticides longer lasting could provide a less controversial and more acceptable and effective alternative insecticide formulations than DDT.MethodsThis study sought to investigate the reasons behind the often reported longer lasting behaviour of DDT by exposing all the WHO approved insecticides to high temperature, high humidity and ultra-violet light. Interactions between the insecticides and some mineral powders in the presence of an aqueous medium were also tested. Simple insecticidal paints were made using slurries of these mineral powders whilst some insecticides were dispersed into a conventional acrylic paint binder. These formulations were then spray painted on neat and manure coated mud plaques, representative of the material typically used in rural mud houses, at twice the upper limit of the WHO recommended dosage range. DDT was applied directly onto mud plaques at four times the WHO recommended concentration and on manure plaques at twice WHO recommended concentration. All plaques were subjected to accelerated ageing conditions of 40°C and a relative humidity of 90%.ResultsThe pyrethroids insecticides outperformed the carbamates and DDT in the accelerated ageing tests. Thus UV exposure, high temperature oxidation and high humidity per se were ruled out as the main causes of failure of the alternative insecticides. Gas chromatography (GC) spectrograms showed that phosphogypsum stabilised the insecticides the most against alkaline degradation (i.e., hydrolysis). Bioassay testing showed that the period of efficacy of some of these formulations was comparable to that of DDT when sprayed on mud surfaces or cattle manure coated surfaces.ConclusionsBioassay experiments indicated that incorporating insecticides into a conventional paint binder or adsorbing them onto phosphogypsum can provide for extended effective life spans that compare favourably with DDT's performance under accelerated ageing conditions. Best results were obtained with propoxur in standard acrylic emulsion paint. Similarly, insecticides adsorbed on phosphogypsum and sprayed on cattle manure coated surfaces provided superior lifespans compared with DDT sprayed directly on a similar surface.

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“…Indeed, during a warehouse fire, pesticides lead to numerous by-products that may cause disastrous consequences for the environment and the population [2]. However, toxic and eco-toxic effects of a fire are dependent on the materials stored in the warehouse [3]. Studying the thermal decomposition of these molecules is therefore an important way to predict the potential hazard of a pesticide warehouse fire.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of thermal decomposition of a pesticide for safety concerns: Case of Mancozeb

Giroud¹,

Dorge²,

Trouvé³

2010

Journal of Hazardous Materials

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Thermal degradation of pesticides under oxidative conditions

Cited by 37 publications

References 23 publications

Effects of milling on the extraction efficiency of incurred pesticides in cereals

Effects of milling on the extraction efficiency of incurred pesticides in cereals

Degradation of insecticides used for indoor spraying in malaria control and possible solutions

Mechanism of thermal decomposition of a pesticide for safety concerns: Case of Mancozeb

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