Simple approach based on ultrasound-assisted emulsification-microextraction for determination of polibrominated flame retardants in water samples by gas chromatography–mass spectrometry

Fontana, A.; Wuilloud, Rodolfo G.; Martínez, Luis D.; Altamirano, Jorgelina Cecilia

doi:10.1016/j.chroma.2008.11.034

Cited by 111 publications

(66 citation statements)

References 40 publications

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“…Alguns autores também atribuem a menor recuperação aos efeitos de diluição dos extratos. 25,26 O volume do solvente extrator praticamente não teve efeito sobre a recuperação da TER e HEX e causou um pequeno aumento na recuperação do FLU. A utilização de 100 µL de solvente extrator proporcionou as maiores recuperações para a maioria dos analitos avaliados e permitiu a injeção automática dos extratos.…”

Section: Volume De Solvente Extratorunclassified

Ultrasound Vortex Assisted Dispersive Liquid-Liquid Microextraction (Usvadllme) Applied to the Determination of the Triazole Flutriafol and Triazines and Triazinones Pesticides in Water

Duarte¹,

Dores²,

Villa³

2016

Química Nova

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Recebido em 16/12/2015; aceito em 18/04/2016; publicado na web em 17/06/2016 ULTRASOUND VORTEX ASSISTED DISPERSIVE LIQUID-LIQUID MICROEXTRACTION (USVADLLME) APPLIED TO THE DETERMINATION OF THE TRIAZOLE FLUTRIAFOL AND TRIAZINES AND TRIAZINONES PESTICIDES IN WATER. This study aimed at developing and validating a method for the simultaneous determination of triazines (ametryne, atrazine, prometryne and terbuthylazine), triazinones (metribuzin and hexazinone) and a triazole (flutriafol) in water by ultrasound vortex assisted dispersive liquid-liquid microextraction (USVADLLME) and GC-MS. The experimental conditions that provided the best results were: 5.00 mL of sample, 100 mL of extractor solvent (toluene), vortex agitation for 30 s and sonication for 1 min. at 240 W and 40 °C. The USVADLLME provided recoveries ranging from 77.2% to 109%, with a repetitivity and intermediate precision varying from 1.4 to 9.0% and 2.9 to 15%, respectively. The method detection limits ranged between 0.10 and 2.71 µg L -1. The method was applied to different surface water samples and a matrix effect was not observed. Once validated, the proposed method was applied to ten water samples of an important agricultural region of Mato Grosso State/Brazil, but none of the studied analytes were detected. The USVADLLME is proposed as an efficient, fast, simple and non-expensive alternative technique for the simultaneous determination of multiclass pesticides in water.Keywords: method validation; herbicides; gas chromatography. INTRODUÇÃOAs triazinas e as triazinonas estão dentre as classes de herbicidas mais utilizadas no mundo, principalmente no controle seletivo de ervas daninhas de folha larga e gramíneas em lavouras de milho, soja e algodão. A preocupação com a persistência, mobilidade e a toxicidade destes agrotóxicos tem sido crescente, devido à detecção dos mesmos em águas subterrâneas e em diferentes compartimentos ambientais. 1,2 O triazol flutriafol possui uma ampla atividade fungicida e também é muito utilizado em culturas de cereais. Embora seja considerado de baixa toxicidade, o flutriafol é extremamente persistente no solo com um elevado potencial de mobilidade e, portanto, um potencial contaminante de águas subterráneas.3 A contaminação de recursos hídricos por agrotóxicos tem sido objeto de grande preocupação mundial e motivado o desenvolvimento de diversos métodos analíticos para a determinação destes compostos em água. [4][5][6] A diversidade de princípios ativos bem como as diferentes características físico-químicas do material a ser analisado são alguns dos fatores que podem limitar a aplicabilidade de muitos destes métodos. Além disso, para determinadas finalidades são necessários métodos com baixos limites de detecção, da ordem de ng L -1 , o que pode requerer etapas de extração e pré-concentração dos analitos. Estas etapas estão dentre as mais críticas do processo, pois delas dependem a exatidão, a precisão e o limite de detecção do método.A extração líquido-líquido (LLE -Liquid-Liquid Extraction) e extração em fase sólid...

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Section: Volume De Solvente Extratorunclassified

Ultrasound Vortex Assisted Dispersive Liquid-Liquid Microextraction (Usvadllme) Applied to the Determination of the Triazole Flutriafol and Triazines and Triazinones Pesticides in Water

Duarte¹,

Dores²,

Villa³

2016

Química Nova

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“…In this study, we used apple vinegar, grape vinegar and coconut water as widely-available and inexpensive replacements for pure organic solvents. The non-flammable and non-volatile nature of these solvents also makes their handling safe and environmental friendly for scale-up of production in developing countries (Diaz-Reinoso et al 2006;Fontana et al 2009;Yapo 2009;Min et al 2011).…”

Section: Introductionmentioning

confidence: 99%

The influence of extraction solvents on the anticancer activities of Palestinian medicinal plants

Alzeer¹,

Vummidi²,

Arafeh³

et al. 2014

J. Med. Plants Res.

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Palestine has a rich and prestigious heritage of herbal medicines. To investigate the impact of variable extraction techniques on the cytotoxic effects of medicinal plant extracts, 5 well-known medicinal plants from Palestine were extracted with 90% ethanol, 80% methanol, acetone, coconut water, apple vinegar, grape vinegar or 5% acetic acid. The resulting 35 extracts were screened for cytotoxic activities against three different cancer cell lines (B16F10, MCF-7 and HeLa) using a standard resazurin-based cytotoxicity assay and Nile Blue A as the positive control. Highly variable toxicities and tissue sensitivity were observed, depending upon the solvent used for extraction. The acetone extract of Salvia officinalis L. exhibited the most potent cytotoxicity (IC50 = 14 -36 ug/ml), but very little sensitivity between the three cell lines. More moderate cytotoxicity with improved tissue sensitivity was observed with coconut water extract of Salvia officinalis L (IC50 = 114 µg/ml) and methanolic extract of Teucrium polium L (IC50 = 104 µg/ml). In this study, acetone consistently gave lower extraction yields but higher cytotoxicity, whereas other solvent systems gave much higher extraction yields with lower cytotoxicity. These results demonstrate how the cytotoxicity of plant extracts can be inversely proportional to the yield, and that solvent selection plays an important role in both factors. (IC 50 = 104 µg/ml). In this study, acetone consistently gave lower extraction yields but higher cytotoxicity, whereas other solvent systems gave much higher extraction yields with lower cytotoxicity. These results demonstrate how the cytotoxicity of plant extracts can be inversely proportional to the yield, and that solvent selection plays an important role in both factors.

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“…In combination, DLLME system and ultrasound radiation provide an efficient preconcentration technique, termed ultrasonic dispersion liquid-liquid microextraction (US-DLLME), which is based on the implosion bubbles generated by the cavitation phenomenon, which produce intense shock waves in the surrounding liquid, resulting in high-velocity liquid jets. In the vicinity of collapsing bubbles, droplet disruption can be caused by these microjets and thus emulsification can be improved by a smaller droplet size of the dispersed phase generated by these microjets, immediately after droplet disruption [22,23]. Submicron droplet size leads to significant enlargement of the contact surface between both immiscible liquids, improving the masstransfer between the phases [24].…”

Section: Introductionmentioning

confidence: 99%

A novel separation/preconcentration technique based on ultrasonic dispersion liquid-liquid microextraction for determination of trace cobalt by flame atomic absorption spectrometry

Wang¹,

Ke²,

Zhang³

et al. 2012

Bull. Chem. Soc. Eth.

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ABSTRACT. An improved method for the determination of trace cobalt in water samples has been developed using ultrasonic dispersion liquid-liquid microextraction (US-DLLME) prior to flame atomic absorption spectrometry (FAAS) analysis. In this method, cobalt was extracted into the fine droplets of carbon tetrachloride after chelate formation with the water soluble ligand, ammonium pyrrolidine dithiocarbamate (APDC). The fine droplets of carbon tetrachloride were formed and dispersed in the aqueous sample with the help of ultrasonic waves which accelerated the formation of the fine cloudy solution without using disperser solvents. Under optimum conditions, the calibration curve was linear in the range of 2.5-500 µg L -1 , with a detection limit of 0.8 µg L -1 . The relative standard deviation (RSD) for ten replicate measurements of 20 and 500 µg L -1 of cobalt were 3.3 and 2.2%. This proposed method was successfully applied to tap water, river water, and sea water, and accuracy was assessed through the analysis of certified reference water or recovery experiments. Operation simplicity, low cost, high enrichment factor, and low consumption of the extraction solvent are the main advantages of the proposed method.

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Simple approach based on ultrasound-assisted emulsification-microextraction for determination of polibrominated flame retardants in water samples by gas chromatography–mass spectrometry

Cited by 111 publications

References 40 publications

Ultrasound Vortex Assisted Dispersive Liquid-Liquid Microextraction (Usvadllme) Applied to the Determination of the Triazole Flutriafol and Triazines and Triazinones Pesticides in Water

Ultrasound Vortex Assisted Dispersive Liquid-Liquid Microextraction (Usvadllme) Applied to the Determination of the Triazole Flutriafol and Triazines and Triazinones Pesticides in Water

The influence of extraction solvents on the anticancer activities of Palestinian medicinal plants

A novel separation/preconcentration technique based on ultrasonic dispersion liquid-liquid microextraction for determination of trace cobalt by flame atomic absorption spectrometry

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