Synthesis, characterization and applications of pyrocatechol modified amberlite XAD-2 resin for preconcentration and determination of metal ions in water samples by flame atomic absorption spectrometry (FAAS)

Tewari, Pankaj Kumar; Singh, Ajai K.

doi:10.1016/s0039-9140(00)00572-5

Cited by 133 publications

(47 citation statements)

References 41 publications

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“…The sorption capacities of the present SiG-NPPDA adsorbent compares well with those reported for FCPASASG adsorbent recently published by Akl and her colleagues 15 and are better than the sorption capacities reported for silica gel, 19,21,24 Amberlite XAD-2 38,39 and cellulose 40 supports. The adsorbent SiG-NPPDA and the solid chelates formed between SiG-NPPDA adsorbent and the studied metal ions were chemically characterized and confirmed by IR (absorption and reflectance), pH-metric titration and thermo-gravemetric (TG and DTG) analysis.…”

Section: Resultssupporting

confidence: 90%

“…Thus, the determination of trace metal ions is becoming increasingly important because of increased interest in environmental samples. [1][2][3] Flame atomic absorption spectrometry (FAAS) has been widely used for the determination of trace heavy metal ions in water samples, [4][5][6] because of its high specificity and low cost. The presence of even low concentrations (ppb) of some heavy metals in natural water systems can have a hazardous effect on both wild life and humans.…”

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confidence: 99%

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Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

2005

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Trace metal ions have important roles in life, involving a wide spectrum of activities. Thus, the determination of trace metal ions is becoming increasingly important because of increased interest in environmental samples. [1][2][3] Flame atomic absorption spectrometry (FAAS) has been widely used for the determination of trace heavy metal ions in water samples, [4][5][6] because of its high specificity and low cost. The presence of even low concentrations (ppb) of some heavy metals in natural water systems can have a hazardous effect on both wild life and humans.However, the direct determination of trace concentrations of these elements by FAAS is generally difficult because of matrix interference problems and concentrations that are below the detection limits of FAAS. At these low concentrations of metals, the sample often requires preconcentration before analysis can be undertaken. Several methods have been employed in the preconcentration of metal ions from aqueous solutions, such as solvent extraction using chelating agents 7 and the use of polymeric resins. 8These methods suffer from a number of drawbacks. The use of chelating reagents (i.e. iminodiacetate resin) is time consuming, whereas organic resins possess low mechanical stabilities and the time taken for the metal ion to be complexed can reach the order of hours. In addition, these methods are often unselective towards the metal being analyzed, with interference from alkaline earth metals being particularly problematic. 9 In recent years, the use of modified silica gels in the preconcentration of trace metals has been investigated. 10,11 As with applications in catalysis modified silica gels offer the advantages of high surface areas and increased mechanical stability. Silica gel modified with organic functional groups such as -NH2, -SH, and -CH has been a subject of great interest. 12,13 The sorption mechanism of the modified silica gel for the metals was described by Koklu 14 as shown below:(2) NH2 (on surface)Concentration and separation of some microelements on silica gel with grafted chelating groups are represented in Table 1. [15][16][17][18][19][20][21][22][23][24] In the present study, the adsorption characteristics of the modified silica gel (SiG-NPPDA) and its application to the preconcentration and separation of traces of nine heavy metals The use of the chemically modified silica gel N-(3-propyl)-O-phenylenediamine (SiG-NPPDA) adsorbent, for the preconcentration and separation of trace heavy metals, was described. SiG-NPPDA sorbs quantitatively (90 -100% recovery) trace amounts of nine heavy metals, viz., Cd(II), Zn(II), Fe(III), Cu(II), Pb(II), Mn(II), Cr(III), Co(II) and Ni(II) at pH 7 -8. The sorption capacity varies from 350 to 450 µmol g -1 . Desorption was found to be quantitative with 1 -2 M HNO3 or 0.05 M Na2EDTA. The distribution coefficient, Kd and the percentage concentration of the investigated metal ions on the adsorbent at equilibrium, CM,eqm% (Recovery, R%), were studied as a function of experimental parameters.The logarit...

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Section: Resultssupporting

confidence: 90%

mentioning

confidence: 99%

Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

2005

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“…6 Trocadores iônicos e matrizes quelantes são as duas classes mais importantes de extratores de fase sólida. Na maioria dos casos, a extração é realizada com o emprego de adsorventes disponíveis comercialmente.…”

Section: Introductionunclassified

Uso de amêndoas de baru (Dypterix alata) para remoção de Ni(ii) em etanol combustível

Mosquetta¹,

Ribeiro²,

Muñoz³

et al. 2011

Quím. Nova

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Recebido em 3/5/10; aceito em 21/12/10; publicado na web em 25/3/11 USE OF (Dypterix alata) BARU ALMONDS FOR Ni(II) REMOVAL FROM ETHANOL FUEL. The present work describes the sorption potential of Dypterix alata (baru) for removal of Ni(II) in hydrous ethanol. Infrared spectroscopy was used for elucidating possible functional groups responsible for uptaking Ni(II). Sorption studies using Ni(II) standard solutions were carried out in batch experiments as functions of extraction time and pH solution. The Ni(II) was quantified before and after the removal experiments using Flame Atomic Absorption Spectrometry. Furthermore, based on adsorption studies and adsorption isotherms applied to the Langmuir and Freundlich models, it was possible to verify that D. alata presents a high adsorption capacity. The results show that D. alata can be used for removing Ni(II) in ethanol solutions.Keywords: Dypterix alata; nickel; ethanol. INTRODUÇÃOO Brasil é um dos maiores produtores e exportadores de etanol combustível do mundo, com a produção de 24,9 bilhões de litros na safra 2008/2009. Com a produção de carros bicombustíveis, estimase uma taxa de crescimento na produção brasileira de etanol para atender os mercados interno e externo. 1,2 Para que o etanol combustível brasileiro seja introduzido com êxito no mercado internacional, é de extrema importância um maior rigor na regulamentação quanto aos constituintes e possíveis impurezas presentes neste combustível. Tais impurezas, mesmo em baixas concentrações, podem influenciar negativamente o desempenho do motor, 3,4 intensificar as propriedades corrosivas do etanol, 5 aumentar os níveis de emissão de poluentes, 5 poluição de solo, ar e águas, aumentando problemas na saúde publica. Assim, torna-se importante a identificação e quantificação destas impurezas, as quais podem ser incorporadas ao etanol durante as etapas de plantio, processamento e/ou armazenamento.Dentre os contaminantes inorgânicos encontrados no álcool combustível destacam-se os ânions, tais como sulfato e cloreto e os íons metálicos, tais como potássio, sódio, ferro, níquel e cobre, sendo os três últimos, geralmente, provenientes de processos corrosivos sofridos pelas colunas de destilação e reservatórios das destilarias.A extração por fase sólida é um procedimento analítico usual para remoção de contaminantes, especialmente metais, numa dada matriz. 6 Trocadores iônicos e matrizes quelantes são as duas classes mais importantes de extratores de fase sólida. Na maioria dos casos, a extração é realizada com o emprego de adsorventes disponíveis comercialmente. Entretanto, outros materiais denominados bioadsorventes vêm sendo empregados com êxito em processos de separação e pré-concentração de íons metálicos. 7,8 O termo bioadsorvente designa material que não seja produzido sinteticamente; adicionalmente, são de fácil aquisição e, em alguns casos, são subprodutos de processos industriais. 9 Diversos bioadsorventes são utilizados para a remoção de íons metálicos de efluentes industriais. [10][11][12][13][14][15] No enta...

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“…Its advantages include low sample/reagent consumption, high enrichment factors and high sample throughput. Synthetic adsorbents, such as modified silica (C18), 9 fullerene (C60), 10 Amberlite-XAD-2 resins 11 and polyurethane foams (PUF) 12 12,13 In the first case, considering that PUF presents fairly hydrophobic behavior, only neutral complexes, negatively charged complexes or high polarizability molecules can be adsorbed onto its surface. 14 Chelating agents containing dithiophosphate groups, such as ammonium Ο,Ο-diethyldithiophosphate (DDTP) show stability in an acid medium and react with several transition metals and semimetals, but do not react with alkali and alkali earth metals.…”

Section: Introductionmentioning

confidence: 99%

A Sensitive Method for Cadmium Determination Using an On-line Polyurethane Foam Preconcentration System and Thermospray Flame Furnace Atomic Absorption Spectrometry

Tarley

Arruda

2004

ANAL. SCI.

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A new sensitive and low cost method for cadmium determination at µg l -1 levels that combines an on-line preconcentration system with the thermospray flame furnace atomic absorption spectrometry technique (TS-FF-AAS) is described in this work. Cadmium is preconcentrated from an acidic medium (pH 2.0) by forming a complex with ammonium Ο,Ο-diethyldithiophosphate (DDTP), which is then adsorbed onto polyurethane foam (PUF). The elution step is performed by using 80% (v/v) ethanol. The effects of the chemical and flow variables associated with the preconcentration were studied, such as the pH of formation of the Cd-DDTP complex, the DDTP concentration, the preconcentration and elution flow rate and the mass of adsorbent. The present method was operated in volume-mode (2 ml) and provided a linear range from 0.4 to 15.0 µg l -1 with a sample throughput of 16 h -1 . The increase of power detection related to TS-FF-AAS by coupling the preconcentration system was confirmed by the enhancement of sensitivity (ca. 5 times), when compared to the value for TS-FF-AAS alone, thus achieving a low detection limit (0.12 µg l -1 ). The accuracy of the method was confirmed from analyses of spiked water samples and by the use of a reference technique (ETAAS). Certified biological materials were also used for the same purpose.

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Synthesis, characterization and applications of pyrocatechol modified amberlite XAD-2 resin for preconcentration and determination of metal ions in water samples by flame atomic absorption spectrometry (FAAS)

Cited by 133 publications

References 41 publications

Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

Silica Gel Modified with N-(3-Propyl)-O-phenylenediamine: Functionalization, Metal Sorption Equilibrium Studies and Application to Metal Enrichment Prior to Determination by Flame Atomic Absorption Spectrometry

Uso de amêndoas de baru (Dypterix alata) para remoção de Ni(ii) em etanol combustível

A Sensitive Method for Cadmium Determination Using an On-line Polyurethane Foam Preconcentration System and Thermospray Flame Furnace Atomic Absorption Spectrometry

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