Determination of thiamethoxam, triadimenol and deltamethrin in pineapple using SLE-LTP extraction and gas chromatography

Morais, Elisa Helena da Costa; Rodrigues, Alessandra Aparecida Zinato; Queiroz, Maria Eliana Lopes Ribeiro de; Neves, Antônio Augusto; Morais, Paulo Henrique Damasceno de

doi:10.1016/j.foodcont.2014.01.024

Cited by 29 publications

(14 citation statements)

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“…In addition, the use of this same technique to extract pesticides in water has found LOD equal to 3.4 μg L -1 and LOQ equal to 10 μg L -1 for chlorpyrifos 14 . When analyzing the pesticides residues in pineapple samples using the SLE-LTP method, Costa Moraes et al (2014) obtained the LOD equal to 15 µg kg -1 and LOQ equal to 50 µg L -1 for thiamethoxam, and LOD equal to 12 µg kg -1 and LOQ equal to 40 µg L -1 for deltamethrin 10 . However, for all the studied analytes the LOQs found for the proposed method are lower than others in the literature.…”

Section: Methods Validationmentioning

confidence: 99%

“…The goal of this step is to remove selectively the pesticide residues from the samples and promote their preconcentration 9 . Thus, techniques for the determination of pesticide residues in different matrices have significantly evolved in simplification, improvement of extraction and purification of samples, with the main objectives of minimizing sample and solvent consumption 10 .…”

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Optimization and validation of the salting-out assisted liquid-liquid extraction method and analysis by gas chromatography to determine pesticides in water

et al. 2018

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The salting-out assisted liquid-liquid extraction (SALLE) was developed for the analysis of four pesticides (cypermethrin, chlorpyrifos, deltamethrin, and thiamethoxam) in water samples. For its optimization, a 2³ factorial design was used to evaluate the simultaneous behavior of three factors: sample and extraction solvent ratio, saline concentration, and stirring mode. A 1.0 mL saline solution (NaCl) was added to the single-phase mixture of water and extraction solvent to separate the phases. The mixture was stirred, allowed to stand and the top organic phase containing the pesticides of interest was analyzed by gas chromatography coupled with electron capture detector (GC/ECD). The optimized method was validated for some merit figures. The limit of detection of the method ranged from 0.15 to 5.5 µg L-1 and the limit of quantification from 5.5 to 18.2 µg L-1. The method showed satisfactory results for the linearity (R2 ≥ 0,990), precision (CV < 9 %) and accuracy (72 % ≤ recovery ≤ 90 %) for all the assessed analytes. The method showed to be simple, efficient and inexpensive for the extraction of pesticide residues. The validated method was applied to ten samples of water collected in the Zona da Mata region of the state of Minas Gerais, Brazil.

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Optimization and validation of the salting-out assisted liquid-liquid extraction method and analysis by gas chromatography to determine pesticides in water

et al. 2018

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“…Este método já foi aplicado em várias matrizes como abacaxi, 10 O objetivo deste trabalho foi otimizar o método ESL/PBT para determinação de carbofurano em abobrinha por cromatografia líquida de alta eficiência com detector ultravioleta (HPLC-UV) e verificar a presença de carbofurano em amostras de abobrinhas comercializadas no município de Itumbiara -Goiás, Brasil.…”

Section: Figura 1 Estrutura Química Do Carbofuranounclassified

OTIMIZAÇÃO DA EXTRAÇÃO SÓLIDO-LÍQUIDO COM PARTIÇÃO EM BAIXA TEMPERATURA PARA DETERMINAÇÃO DE CARBOFURANO EM Cucurbita pepo L ("ABOBRINHA") POR CROMATOGRAFIA LÍQUIDA DE ALTA EFICIÊNCIA

Rodrigues¹,

Farias²,

Goulart³

et al. 2017

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“…21,22 The principle of the technique was proposed by McCulley and McKinley in 1964, 23 but only in 2007 the technique was modified for pyrethroid determination in water, which was initially named liquid-liquid extraction with lowtemperature partition (LLE-LTP). 24 Significant advances in this technique have been achieved for the monitoring of chemical contaminants and, in the last eight years, it has been optimized and validated for different matrices such as milk, 25 tomato, 26 human urine, 27 beverages, 28 human liver, 29 pineapple, 30 lettuce 31 and Caiman yacare eggs. 32 The principle of SLE-LTP is based on the addition of a homogenous mixture composed of water and organic solvent to the sample.…”

Section: Introductionmentioning

confidence: 99%

Solid-Liquid Extraction with Low Temperature Purification Coupled with Gas Chromatography and Mass Spectrometry for Determination of Polychlorinated Biphenyls in Sewage Sludge

Maia¹,

Arcanjo²,

Pinho³

et al. 2016

Journal of the Brazilian Chemical Society

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Sewage sludge is the residue produced by the wastewater treatment plants, which can be used as soil conditioner in agriculture. However, the current legislation recommends monitoring chemical contaminants such as polychlorinated biphenyls (PCBs). In this study, solid-liquid extraction with low temperature purification (SLE-LTP) was optimized and validated for monitoring six PCBs. The analyses were performed by gas chromatography and mass spectrometry. Sulfur interference was removed by 1.5 g of copper metal. The extraction was carried out using 6.50 mL isopropanol, 1.50 mL ethyl acetate, 0.1 g NaCl, 0.8 mL water and 15 min into ultrasound. Extraction percentages were between 82 and 94% and relative standard deviation ≤ 16% for low concentrations. Detection and quantification limits were 3.3 and 10 µg kg -1 , respectively. The method was applied to sludge samples collected monthly in the wastewater treatment plant and PCB 52 was detected in six samples. Keywords: PCB, sewage sludge, SLE-LTP, extraction method IntroductionSewage sludge is the solid residue produced by the wastewater treatment plants (WWTP). This residue can be used in agriculture as a fertilizer complement or soil conditioner. The sludge has a high content of organic matter and essential elements to plants such as nitrogen and phosphorus. 1,2 However, sewage sludge may contain chemical contaminants which can be transferred to soil, plants, animals, rivers and groundwater. [3][4][5][6] Among the contaminants, polychlorinated biphenyls (PCBs) stand out for being highly persistent in soil, for their low biodegradability and high lipophilicity and the proven harmful effects on biota and carcinogenicity on humans.7-10 Although these compounds have been banned by the 2001 Stockholm Convention, recently, 209 polychlorinated biphenyl congeners have been identified in sewage effluents.11 The PCB congeners named 28, 52, 101, 138, 153 and 180 are known as indicators of environmental pollution due to their highly frequent detection in environmental and biological samples. [12][13][14] PCBs are quantified by gas chromatography and mass spectrometric detection (GC-MS) or electron capture detection (ECD).15 Traditional techniques such as shaker table, 16 soxhlet extraction 17 and ultrasound 18 are the most used ones for PCB studies on sewage sludge.19 Accelerated solvent extraction, a more sophisticated technique, has also been used. 20 Recently, solid-liquid extraction with low temperature purification (SLE-LTP) was used for quantification of polycyclic aromatic hydrocarbons (PAHs) and chlorobenzenes in sewage sludge. 21,22 The principle of SLE-LTP is based on the addition of a homogenous mixture composed of water and organic solvent to the sample. The system is homogenized and cooled to −20 °C to freeze the matrix components and the aqueous phase. The organic phase, typically acetonitrile, remains liquid and extracts the compounds of interest. The Solid-Liquid Extraction with Low Temperature Purification Coupled with Gas Chromatography and Mass Spectrometry ...

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Determination of thiamethoxam, triadimenol and deltamethrin in pineapple using SLE-LTP extraction and gas chromatography

Cited by 29 publications

References 28 publications

Optimization and validation of the salting-out assisted liquid-liquid extraction method and analysis by gas chromatography to determine pesticides in water

Optimization and validation of the salting-out assisted liquid-liquid extraction method and analysis by gas chromatography to determine pesticides in water

OTIMIZAÇÃO DA EXTRAÇÃO SÓLIDO-LÍQUIDO COM PARTIÇÃO EM BAIXA TEMPERATURA PARA DETERMINAÇÃO DE CARBOFURANO EM Cucurbita pepo L ("ABOBRINHA") POR CROMATOGRAFIA LÍQUIDA DE ALTA EFICIÊNCIA

Solid-Liquid Extraction with Low Temperature Purification Coupled with Gas Chromatography and Mass Spectrometry for Determination of Polychlorinated Biphenyls in Sewage Sludge

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