Immobilization of Dithizone on Surfactant-Coated Alumina for Preconcentration of Metal Ions

Hiraide, Masataka; Sorouradin, Mohammad-Hussein; Kawaguchi, Hiroshi

doi:10.2116/analsci.10.125

Cited by 71 publications

(29 citation statements)

References 5 publications

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“…3 Previously, we proposed a new preparation technique of chelating sorbents, where a water-insoluble chelating agent was rapidly introduced into the aggregates of sodium dodecyl sulfate (SDS) on alumina particles. 4 The idea is illustrated in Fig. 1.…”

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confidence: 99%

Use of Surfactant Aggregates Formed on Alumina for the Preparation of Chelating Sorbents

et al. 1995

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To 1.5 g of y-alumina particles in 40 ml of water was added 10 ml of ammoniacal solution containing 1.5 mg of dithizone and 100 mg of sodium dodecyl sulfate. The solution was acidified to pH 2 to form the surfactant aggregates on the alumina surfaces, into which dithizone was trapped. Traces of copper(II) and silver(I) in water were completely collected on the dithizone-coated alumina over a wide range of pH 1-7; cadmium(II), cobalt(II), nickel(II), lead(II) and zinc(II) were simultaneously recovered at pH 3 -7. The chelating sorbent functioned well even in aqueous solutions containing a large amount of matrix element. The proposed sorption method has been successfully applied to the determination of traces of copper in lead metal.

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confidence: 99%

Use of Surfactant Aggregates Formed on Alumina for the Preparation of Chelating Sorbents

et al. 1995

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“…[31][32][33][34][35][36] It was also confirmed that, while microcolumn of alumina or alumina coated with SDS show no tendency for retention of thallium ions, the microcolumn of immobilized macrocycle on surfactant coated alumina was capable of retaining thallium ions from the sample solution quantitatively. However, the immobilized DB18C6 sorbent was more stable with better repeatability than immobilized 18C6 at high preconcentration volume.…”

Section: Resultsmentioning

confidence: 72%

“…29 However, to the best of our knowledge, reports on physical immobilization of crown ethers on solid supports used as the sorbent for preparation of column or microcolumn of solid phase extraction of metal ions is rare. 30 Over the past decade, the effectiveness and versatility of physically immobilization of chelating agents on surfactant coated alumina as a column preconcentration media in batch [31][32][33] and FIA [34][35][36] system had been demonstrated. However, hitherto no such study has been directed for immobilization of macrocyclic ligands.…”

Section: Introductionmentioning

confidence: 99%

Determination of thallium traces by ETAAS after on-line matrix separation and preconcentration in a flow injection system

Asadoulahi¹,

Dadfarnia²,

Shabani³

2007

J. Braz. Chem. Soc.

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Um sistema de injeção em fluxo sensível e simples foi desenvolvido para separação, pré-concentração e determinação de tálio. A pré-concentração é baseada na sorção do analito em uma microcoluna de dibenzo-18-coroa-6 (DB18C6) imobilizada em alumina revestida com surfactante e subseqüente eluição com solução de ácido nítrico (500 µL, 2 mol L -1 ). A concentração de tálio no eluente foi determinada por espectrometria de absorção atômica com atomização eletrotérmica. Os fatores que influenciaram a sorção e dessorção de íon tálio foram investigados. Para um volume da amostra de 5 mL, a calibração foi linear no intervalo de 0,1 a 20 µg L -1 (r = 0,9996) com um limite de detecção de 0,05 µg L -1 . A capacidade máxima de sorção foi de 1432 µg de tálio por grama do sorbente. A precisão do método para 1 µg L -1 foi 5,7% RSD (n = 11). O método foi aplicado para determinação de tálio em água, cabelo, unha e em materiais de referência certificados. A exatidão foi avaliada empregando experimentos de adição e recuperação ou por comparação dos resultados com materiais de referência certificados.A simple and sensitive flow injection system was developed for separation, preconcentration and determination of thallium. Preconcentration is based on the analyte sorption on a microcolumn of dibenzo-18-crown-6 (DB18C6) immobilized on surfactant coated alumina with subsequent elution using a nitric acid solution (500 µL, 2 mol L -1 ). The concentration of thallium in the eluent was determined using electrothermal atomic absorption spectrometry. Factors influencing the sorption and desorption of thallium ion were investigated. Using a sample volume of 5 mL, the calibration was linear from 0.1 to 20 µg L -1 range (r = 0.9996) with a detection limit of 0.05 µg L -1 . The maximum sorption capacity was 1432 µg of thallium per gram of sorbent. The precision of the method at 1 µg L -1 was 5.7% RSD (n = 11). The method was applied for determination of thallium in water, hair, nail, and standard reference samples. The accuracy was assessed using addition-recovery experiment or by comparison of the results with certified reference materials.

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“…[5][6][7][8] Typically, simple mixing of an ionic surfactant with an oppositely charged mineral oxide in water affords admicelles, which provide nanometer-sized hydrophobic extraction media similar to those of normal micelles. Depending on the surfactant concentration and the ionic strength, the surfactant molecules self-assemble at the interface into various forms of aggregates, such as monolayered, bilayered, spherical, spheroidal, and cylindrical structures.…”

Section: Introductionmentioning

confidence: 99%

Solid-Phase Extraction Followed by HPLC for the Determination of Phosphorus(V) and Arsenic(V)

2009

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Traces of P(V) and As(V) in sample solutions were converted into heteropoly molybdic acids at pH 1.5 and collected onto polyoxyethylene(20)-4-isononylphenoxy ether-coated Amberlite XAD-4 particles. The desorption was carried out with 0.3 M tetramethylammonium hydroxide solution for the HPLC analysis. Molybdophosphoric and molybdoarsenic acids were separated from excess molybdate by ion-pair reversed phase HPLC, though the peaks of P(V) and As(V) could not be resolved. However, the selective decomposition of molybdoarsenic acid with citric acid allowed the differential determination of P(V) and As(V) at the ng mL -1 level. The proposed method was applied to the analysis of high-purity iron for P and As.

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Immobilization of Dithizone on Surfactant-Coated Alumina for Preconcentration of Metal Ions

Cited by 71 publications

References 5 publications

Use of Surfactant Aggregates Formed on Alumina for the Preparation of Chelating Sorbents

Use of Surfactant Aggregates Formed on Alumina for the Preparation of Chelating Sorbents

Determination of thallium traces by ETAAS after on-line matrix separation and preconcentration in a flow injection system

Solid-Phase Extraction Followed by HPLC for the Determination of Phosphorus(V) and Arsenic(V)

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