Otimização e validação da técnica de extração líquido-líquido com partição em baixa temperatura (ELL-PBT) para piretróides em água e análise por CG

Vieira, Heulla Pereira; Neves, Antônio Augusto; Queiroz, Maria Eliana Lopes Ribeiro de

doi:10.1590/s0100-40422007000300006

Cited by 53 publications

(41 citation statements)

References 15 publications

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“…It can be observed in Figures 2a and 3a that the volume increase of acetonitrile from 2 to 4 mL caused an increase of approximately 21% in efficiency of pesticide extraction for the three carbamates in the two beverages studied. In the LLE-LTP technique, it was observed in this study, as well as in similar studies, 64,71,73,74 that a sample to solvent extractor volume of 1:2 (v/v) facilitated the migration of the solutes to the organic phase, independent of the matrix and class of pesticides studied. …”

supporting

confidence: 74%

“…Recently, SE-LTP (liquid-liquid extraction or solid-liquid extraction with low temperature partitioning) has emerged as an alternative for pesticide extraction in water, 64,71 milk, 72,73 honey, 74 tomato, 75 fish, 76 meat and fatty matrices, 77 virgin olive oil 78,79 and butter. 80 One modification for this technique was proposed for quantification of 15 sulfonamides in porcine liver 61 and four benzodiazepines in human urine.…”

Section: Introductionmentioning

confidence: 99%

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Determination of carbamates in beverages by liquid-liquid extraction with low temperature partitioning and liquid chromatography

Goulart¹,

Alves²,

Paula³

et al. 2012

J. Braz. Chem. Soc.

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Carbamatos são os pesticidas mais frequentemente encontrados em alimentos e bebidas de coloração escura em casos de intoxicação acidental ou intencional. Neste trabalho, extração líquido-líquido com partição em baixa temperatura (LLE-LTP) foi otimizada e validada para determinação dos carbamatos aldicarb, carbofuran e carbaril em bebidas de sucos de uva e leite achocolatado. Este método envolve a extração com acetonitrila, partição líquido-líquido em baixa temperatura e análise por cromatografia líquida de alta eficiência com detecção ultravioleta (HPLC-UV). O método é rápido, eficiente e de baixo custo, emprega pequenos volumes de solvente por amostra e não necessita de limpeza dos extratos. O método de extração foi seletivo e apresentou porcentagens de extração acima de 90%. As premissas relacionadas com os testes estatísticos de linearidade foram verificadas e confirmadas. O método de extração e análise foi validado com resultados satisfatórios e pode ser aplicado em análises de rotina e forenses.Carbamates are the pesticides most commonly found in dark colored foods and beverages in cases of accidental or intentional poisoning. In this work, the liquid-liquid extraction with low temperature partitioning (LLE-LTP) was optimized and validated for determination of the carbamates aldicarb, carbofuran and carbaryl in grape juice and chocolate milk beverages. This method involved extraction with acetonitrile, liquid-liquid partition at low temperature and the analysis by high performance liquid chromatography with ultraviolet detection (HPLC-UV). The method is rapid, efficient and of low-cost, employing small volumes of solvent per sample and requiring no cleanup of the extracts. The extraction methodology was selective and presented recovery percentages above 90%. The premises related to the statistical linearity tests were checked and confirmed. The method of extraction and analysis was validated with satisfactory results, and may be applied in forensic and routine analysis Keywords: carbamates, low temperature partitioning, high performance liquid chromatography, sample preparation, validation IntroductionCarbamate insecticides are widely used in gardening and agriculture due to their broad spectrum of activity and relatively short environmental persistence. However, they are potentially toxic to humans, particularly in the context of intentional self-poisoning. 1,2 Carbamates are found as commercialized products for agricultural practices and some compounds of this group, with their respective commercial names are: carbaryl (Sevin ® ), aldicarb (Temik ® ) and carbofuran (Furadan ® ). From these, aldicarb stands out as the main target on the list of controlled pesticides of the United States Environmental Protection Agency (EPA) due to its elevated toxicity to mammals. 3,4 The maximum residue level (MRL) of aldicarb 5,6 and carbofuran 6 in water is 10 and 7 μg L -1 , respectively. In Goulart et al. 1155 Vol. 23, No. 6, 2012 milk, the MRLs established for aldicarb, 7,8 Exposures may occur accidentally, with ...

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supporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Determination of carbamates in beverages by liquid-liquid extraction with low temperature partitioning and liquid chromatography

Goulart¹,

Alves²,

Paula³

et al. 2012

J. Braz. Chem. Soc.

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“…Separation of the organophosphorus pesticide chlorpyrifos from water was performed according to the method proposed by Vieira et al (2007), namely Liquid-Liquid Extraction with Low Temperature Partitioning (LLE-LTP), with adaptations for specific extraction of chlorpyrifos such as proportion between sample and solvent volumes 1:1 (v/v). Analysis of the organic extracts for quantification of chlorpyrifos was performed by gas chromatograph using a Shimadzu model GC-2014 with Ni electron capture detection (GC/ECD), auto injector AOC-20i.…”

Section: Methodsmentioning

confidence: 99%

Removal of chlorpyrifos insecticide in constructed wetlands with different plant species

Souza

Borges

Matos

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to evaluate the remediation of water containing the insecticide chlorpyrifos by using constructed wetlands (CW) cultivated with Polygonum punctatum, Cynodon spp. and Mentha aquatica, operated under different hydraulic retention times: 24, 48, 96, 144 and 192 h. The system efficiency was based on reduction of the initial concentration of chlorpyrifos and toxicity of the contaminated water. The results showed that constructed wetlands are an excellent alternative for remediation of the insecticide chlorpyrifos in aqueous medium. It was observed that the average overall removal efficiency of the insecticide was 98.6%, and in the first hydraulic retention time, 24 h, chlorpyrifos was removed to levels below the detection limit in all CW. This result is mainly attributed to adsorption and microbial degradation. For the qualitative standard acute toxicity tests with Daphnia similis, for most samples there was a reduction in toxicity greater than 80%. It was reported that the ecotoxicological tests with the effluents of the constructed wetland are a good option as an indicator of the effectiveness of treatments and a promising alternative to complement the physical and chemical analyses.Remoção do inseticida clorpirifós em sistemas alagados construídos cultivados com diferentes espécies vegetais R E S U M O Objetivou-se neste trabalho avaliar a remediação de água contendo o inseticida clorpirifós, por meio de sistemas alagados construídos (SAC) cultivados com as espécies Polygonum punctatum, Cynodon spp. e Mentha aquatica operados sob diferentes tempos de retenção hidráulica: 24, 48, 96, 144 e 192 h. A eficiência do sistema foi baseada na redução da concentração inicial do clorpirifós e toxicidade da água contaminada. Os resultados mostraram que os sistemas alagados construídos são uma excelente alternativa na biorremediação do inseticida clorpirifós no meio aquoso. Observou-se média geral de eficiência na remoção do inseticida de 98,6%, sendo que no primeiro tempo de retenção hidráulica, 24 h, houve remoção do clorpirifós para valores inferiores ao limite detecção para todos os SAC. Tal resultado é atribuído principalmente aos processos de adsorção e degradação microbiana. Para os ensaios padronizados qualitativos de toxicidade aguda com Daphnia similis, para a maioria das amostras observou-se a redução de toxicidade acima de 80%. Constatou-se que os testes ecotoxicológicos com os efluentes dos sistemas alagados construídos estudados são uma boa opção como indicativo da eficiência dos tratamentos e uma promissora alternativa na complementação de análises físicas e químicas.

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“…To quantify ametryn concentration in the different depths of the columns, herbicide was extracted from soil samples, using the solid liquid extraction technique with lowtemperature partitioning, proposed by Vieira et al (2007) and Goulart et al (2008).…”

Section: Methodsmentioning

confidence: 99%

Ametryn Leaching in Soils from the Sugarcane Region in Northeastern Brazilian

et al. 2016

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-Ametryn is one of the most widely used herbicides in the sugarcane culture. Little is known about the interactions between this herbicide and the attributes of soils in the sugarcane region of northeastern Brazil. This knowledge, before recommending herbicide, will minimize the negative effects on the environment, particularly on water resources, and will ensure weed control efficacy. In this work, ametryn leaching potential was estimated through bioassays and chromatography, in five soils from the sugarcane region in northeastern Brazil: Quartzarenic Neosol (Entisol); Red Argisol (Ultisol); Ferrihumiluvic Spodosol (Spodosols); Red-Yellow Acrisol (Oxisol) and Haplic Cambisol (Inceptisols). To achieve this, columns were prepared with samples of the respective soils. On top of these columns ametryn was applied and, 12 hours later, a 60 mm rainfall was simulated. After water draining (72 hours after herbicide application), the columns were longitudinally opened to withdraw samples of each soil, every 5 cm. On some of these samples, ametryn quantification was performed by high-performance liquid chromatography and, on the others, biological assays were performed to confirm the results. Ametryn mobility was influenced by the physical-chemical characteristics of soils, mainly by organic matter content, texture and cation exchange capacity (CEC). However, this cannot be considered for Ferrihumiluvic Spodosol, whose cementing characteristics restrict the infiltration of water and organic compounds. Increased leaching ametryn occurred in Quartzarenic Neosol (Entisol), with higher herbicide concentration in the 5 to 10 cm depth layer, in relation to the 0 to 5 cm surface layer, indicating possible agronomic efficiency loss and higher risk of groundwater contamination.Keywords: herbicide, liquid chromatography, bioassay, mobility. RESUMO -O ametryn é um dos herbicidas mais utilizados na cultura da cana-de-açúcar, e pouco se conhece sobre as interações desse herbicida com os atributos dos solos da região canavieira do Nordeste brasileiro. Esse conhecimento antes da recomendação do herbicida permite minimizar os efeitos negativos ao ambiente -em especial, aos recursos hídricos -e garantir a eficiência no

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Otimização e validação da técnica de extração líquido-líquido com partição em baixa temperatura (ELL-PBT) para piretróides em água e análise por CG

Cited by 53 publications

References 15 publications

Determination of carbamates in beverages by liquid-liquid extraction with low temperature partitioning and liquid chromatography

Determination of carbamates in beverages by liquid-liquid extraction with low temperature partitioning and liquid chromatography

Removal of chlorpyrifos insecticide in constructed wetlands with different plant species

Ametryn Leaching in Soils from the Sugarcane Region in Northeastern Brazilian

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