Cellulose microfiber functionalized with N,N′-bis (2-aminoethyl)-1,2-ethanediamine as a solid sorbent for the fast preconcentration of Cd(II) in flow system analysis

Oliveira, Fernanda Midori de; Somera, Bruna Fabrin; Corazza, Marcela Zanetti; Yabe, Maria Josefa Santos; Segatelli, Mariana Gava; Ribeiro, Emerson Schwingel; Lima, Éder C.; Dias, Susana Oliveira; Tarley, César Ricardo Teixeira

doi:10.1016/j.talanta.2011.07.088

Cited by 38 publications

(11 citation statements)

References 39 publications

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“…The minicolumn was connected at the sampling loop place of the injector, and all the connections were kept as short as possible to minimize dead volumes. The on-line continuous flow copper enrichment system used in the present research was previously reported by our research group [21]. In the preconcentration step, 13 mL of the sample solution (pH 9.13, 0.14 mol L −1 ammoniacal buffer) were percolated through the minicolumn at a flow rate of 5.0 mL min −1 .…”

Section: Minicolumn Preparation and On-line Continuous Flow Copper Enmentioning

confidence: 99%

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

et al. 2012

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We describe the analytical performance of a hybrid material composed of SiO 2 , Al 2 O 3 and TiO 2 . It was prepared by a sol-gel process and can act as an adsorbent in the continuous-flow enrichment of copper. A minicolumn was packed with the material, copper ions are adsorbed at pH 9.13, then eluted with 1.0 mol L −1 nitric acid, and determined by FAAS. The material was characterized by infrared spectroscopy, scanning electron and energy dispersive spectroscopy, energy dispersive X-ray fluorescence analysis, powder Xray diffraction, and specific surface area analysis. No significant interference was observed for most ions in up to copper/ interferent ratios of 1:100 and of 1:500 in case of Ca(II), Ba (II), and Mg(II). The breakthrough capacity is 1.4 mg g −1 under dynamic conditions. The limits of detection and of quantification are 0.50 and 1.4 μg L −1 , respectively, and the calibration plot is linear in the range from 5.0 to 245.0 μg L −1 (r00.999). The relative standard deviation is 3.20 (for n07 and at a Cu(II) concentration of 10 μg L −1 ). The method was applied to the determination of trace copper ions in water, vegetable and alcohol fuel samples.

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Section: Minicolumn Preparation and On-line Continuous Flow Copper Enmentioning

confidence: 99%

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

et al. 2012

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“…Na sequência, as amostras foram resfriadas com adição posterior de 5 mL de H 2 O 2 30% (v/v). 24 A solução resultante foi aquecida em chapa de aquecimento em cerca de 100 o C até quase a secura, com ajuste posterior do pH em 2,0 e aferição em balão volumétrico de 50 mL. No preparo da amostra de chá solúvel, 390 mg foram dissolvidos em 40 mL de água fervente.…”

Section: Amostras/preparo Das Amostrasunclassified

Extração/pré-concentração de íons cobre no ponto nuvem explorando a formação de complexos com DMIT [4,5-dimercapto-1,3-ditiol-2-tionato]

Somera¹,

Oliveira²,

Barreto³

et al. 2012

Quím. Nova

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, by preconcentrating 12.0 and 24.0 mL of sample, respectively. The method was applied for copper determination in water samples, synthetic saliva, guarana powder, tea samples and soft drinks and the accuracy was assessed by analyzing the certified reference materials Dogfish Liver (DOLT-4) and Lobster Hepatopancreas (TORT-2).Keywords: cloud point preconcentration; copper; DMIT [4,5-dimercapto-1,3-dithyol-2-thionate]. INTRODUÇÃOA extração no ponto nuvem é uma técnica que se baseia no fenômeno de turbidez de uma solução aquosa contendo surfactante acima da concentração micelar crítica, ocasionado pela adição de alguma substância apropriada (sais ou ácidos) ou por alteração de suas propriedades, como temperatura ou pressão. Quando a solução se torna turva diz-se que o surfactante atinge o ponto nuvem, devido ao decréscimo de sua solubilidade no meio aquoso, e a solução se separa em duas fases isotrópicas, sendo uma rica em surfactante e de pequeno volume contendo os compostos extraídos da solução original, e outra, de grande volume contendo pequena quantidade de surfactante, denominada de fase pobre, que deve ser descartada.1,2 Devido à partição líquido-líquido dos compostos na fase rica em agregados micelares, bem como pelo caráter atóxico dos surfactantes e elevados fatores de pré-concentração usualmente obtidos, a técnica de extração no ponto nuvem tem sido bastante empregada na pré-concentração de metais e moléculas orgânicas em detrimento da extração convencional líquido-líquido com solventes orgânicos.3,4 A pré-concentração de íons metálicos no ponto nuvem é comumente realizada na forma de quelato metálico altamente hidrofóbico em meio aquoso, para que o mesmo possa ser retido no interior das estruturas micelares constituídas de cadeias alquílicas.5 Assim, a adoção adequada do ligante e surfactante pode conferir elevada sensibilidade e seletividade ao método de pré-concentração. Métodos espectrométricos de absorção e emissão atômica associados com a etapa de pré-concentração no ponto nuvem são tradicionalmente relatados na literatura, visando a determinação de metais e/ou especiação em amostras de interesse ambiental, alimentício e clínico.6 Cita-se, por exemplo, a determinação de chumbo, cobre e cobalto por espectrometria de absorção atômica em chama (FAAS) em amostras de águas e alimentos após complexação com 1-feniltiossemicarbazida (1-PTSC) em pH 9,0 e pré-concentração no ponto nuvem.7 Em trabalho prévio, 8 os autores desenvolveram um método de pré-concentração no ponto nuvem para determinação de cobre, níquel e cobalto em amostras biológicas, águas naturais e efluentes, solos e amostras de sangue. Neste trabalho foi utilizado o ligante metil-2-piridilcetona (MPKO) cuja reação de complexação ocorreu em pH 10. Dentre outros ligantes utilizados na pré-concentração no ponto nuvem é relatado o uso de 1,2-di-hidroxiantraquinona-

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“…chelating agent for metals) to a wide range of natural and pre synthesised solid supports. Among the favered preferred subtances are; silica gel [18][19][20], activated carbon [21,22], chelating ion exchange resins [23], naphthalene [24], zeolite [25], C18 [26], cellulosic derivatives [27], alumina [28,29], and XAD resins [30]. Extensive overview with demonstrative examples of the diffrent preparation methods for chelating resins can be found in many comperhensive reviews [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 8-hydroxyquinoline-Amberlite IRC-50 chelator for solid phase extraction of trace metals from groundwater samples

Labban

AlMohaimdi

Alahmadi

et al. 2020

Journal of Taibah University for Science

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In this work, Amberlite IRC-50 cation exchanger has been chemically functionalized with 8hydroxyquinoline chelator to enhance its sorption capacity and selectivity toward transition metals. The resin characterized with X-ray photoelectron spectroscopy (XPS), attenuated total reflection infrared spectroscopy (ATR-IR), scanning electron microscope (SEM), and elemental analysis. Under optimum conditions, the sorption capacity values for Mn (II), Cu(II), Co(II) and Ni(II) ions have been increased by 50% or more in comparison with plain resin. The calibration curves for the studied ions were linear over the concentration range from 0 (blank) to 50 ng/ml. with R2 from 0.994-0.999. The LOD values for Mn(II), Cu(II), Co(II) and Ni(II) were 0.024, 0.035, 0.048, and 0.058 ng ml −1 respectively. The sorbent worked well as an efficient SPE material for the studied ions from groundwater real samples prior to their analysis by ICP-MS. The acceptable recovery and accuracy values prove its competence to extract these metals from groundwater matrices.

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Cellulose microfiber functionalized with N,N′-bis (2-aminoethyl)-1,2-ethanediamine as a solid sorbent for the fast preconcentration of Cd(II) in flow system analysis

Cited by 38 publications

References 39 publications

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

Extração/pré-concentração de íons cobre no ponto nuvem explorando a formação de complexos com DMIT [4,5-dimercapto-1,3-ditiol-2-tionato]

Synthesis of 8-hydroxyquinoline-Amberlite IRC-50 chelator for solid phase extraction of trace metals from groundwater samples

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