Lead preconcentration onto C-18 minicolumn in continuous flow and its determination in biological and vegetable samples by flame atomic absorption spectrometry

Lima, Rosimar; Leandro, Kátia Christina; Santelli, Ricardo Erthal

doi:10.1016/0039-9140(96)01845-0

Cited by 47 publications

(15 citation statements)

References 17 publications

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“…4,5 Various procedures have been described for the determination of Pb by FAAS. [6][7][8][9][10][11][12][13][14][15] Most frequently, C 18 bonded silica gel sorbent [11][12][13][14][15] is used as the support material, while other adsorbents, including activated carbon, 16 alumina, 17 cellulose, 18 and Chromosorb 102, 19 have also been used. Hydride generation (HG) has been a powerful means of sample introduction for the determination of hydride-forming elements, such as arsenic (As), antimony (Sb), bismuth (Bi) and selenium (Se), by FAAS due to the efficient transport and atomization of gaseous hydride.…”

Section: Introductionmentioning

confidence: 99%

Determination of lead by hydride generation atom trapping flame atomic absorption spectrometry

Ertaş

Arslan

Tyson

2008

J. Anal. At. Spectrom.

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An atom trapping approach is described for the determination of lead by hydride generation flame atomic absorption spectrometry. Lead hydride (PbH 4 ), generated on-line by reacting lead in hydrochloric acid-potassium ferricyanide medium with sodium borohydride (NaBH 4 ), was trapped on the interior walls of a slotted T-tube under highly oxidizing flame conditions. Atomization was achieved by aspirating 50 mL of methyl isobutyl ketone (MIBK) to the flame. Optimization of the experimental parameters for the generation and collection of lead hydride was described to achieve the highest peak height sensitivity. The detection limits were 0.075, 0.047 and 0.028 mg L À1 for 2.6, 5.2 and 7.8 mL of blank solution (n = 13), respectively. Calibration was linear up to 3.0 mg L À1 for a 30-s trapping period. The relative standard deviation was between 2 and 4%. The method was successfully applied to the determination of Pb in NIST certified reference materials, San Joaquin Soil (SRM 2709) and Apple Leaves (SRM 1515).

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Section: Introductionmentioning

confidence: 99%

Determination of lead by hydride generation atom trapping flame atomic absorption spectrometry

Ertaş

Arslan

Tyson

2008

J. Anal. At. Spectrom.

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“…In addition, it offers an alternative procedure to technique such as GFAAS for determination of lead at μg L -1 level in different matrices. Performance characteristics such as detection limit, capability and precision compare favorably with earlier FI-AAS studies, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and have the advantage of tolerance of different matrices. In addition the preparation of sorbent is fairly easy and does not require any chemical reaction.…”

Section: Discussionmentioning

confidence: 48%

Immobilized stearic acid as a new sorbent for on-line preconcentration and determination of lead by flow injection flame atomic absorption spectrometry

Dadfarnia¹,

Shabani²,

Dehghani³

2006

J. Braz. Chem. Soc.

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O presente estudo examina a possibilidade de imobilização do ácido esteárico em naftaleno microcristalino para a preparação de microcoluna e avalia seu potencial para adsorção e pré-concentração de quantidades traço de íons metálicos. Esse sorvente apresentou alta afinidade para chumbo. Conseqüentemente, foi elaborada uma rápida estratégia de pré-concentração empregando sistema de injeção em fluxo para determinação de chumbo por Espectrometria de Absorção Atômica com chama. A pré-concentração foi baseada no acúmulo do analito na microcoluna de ácido esteárico imobilizado e subseqüente eluição por injeção de pequeno volume de solução de ácido nítrico 1 mol L -1 (250 μL). Um volume de amostra de 20 mL resultou em um fator de pré-concentração de 84 vezes e o desvio padrão relativo para soluções contendo 40 e 200 μg L -1 foi 5,1 e 1,2%, respectivamente. O procedimento foi aplicado para água de torneira, de rio e de mar, suco de maçã, folha de beterraba, urina e aço inoxidável certificado. A exatidão foi comprovada por experimentos de recuperação, por Espectrometria de Absorção Atômica com Forno de Grafite e análise de um material de referência certificado composto por aço inoxidável.The present study examines the possibility of immobilization of stearic acid on microcrystalline naphthalene for preparation of microcolumn and evaluation of its potential for adsorption and preconcentration of trace amounts of metal ions. It was found that this sorbent has high affinity for lead. Consequently, a rapid on-line preconcentration technique for the determination of lead by Flow Injection Flame Atomic Absorption Spectrometry had been devised. Preconcentration was based on accumulation of analyte on immobilized stearic acid microcolumn and subsequent elution by injection of a small volume of nitric acid (250 μL of 1 mol L -1 ). A sample volume of 20 mL resulted in a preconcentration factor of 84, and relative standard deviations for solutions containing 40 and 200 μg L -1 were 5.1 and 1.2%, respectively. The procedure was applied to tap water, river water, sea water, apple juice, beet leaf, urine, and certified stainless steel. The accuracy was proved by performing recovery experiments, Graphite Furnace Atomic Absorption Spectrometry measurements, and analysis of a stainless steel certified reference material.

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“…9 Recently, the SPE cartridges and disks were widely and successfully used for extraction, preconcentration and separation of trace metal ions from different matrixes. [10][11][12][13][14][15][16][17] Several other techniques for the extraction and preconcentration of mercury have been proposed, including, liquid-liquid extraction by reagent 6,18 , preconcentration and precollection by hydride generation/cryogenic trapping 19 , preconcentration by gold amalgam 20 , in situ concentration of mercury vapour in a palladium-coated graphite tube 21 , etc. However, most of these methods are affected by problems, such as the need for large amounts of ligands, reagents and high purity solvents, disposal of organic solvents, long procedures and high cost apparatus.…”

Section: Introductionmentioning

confidence: 99%

DABTZ as a New Reagent for Solid Phase Extraction and Spectrophotometric Determination of Trace Amount of Hg(II) in Water Sample

2006

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Summary -A novel sensitive and simple method for rapid and selective extraction, preconcentration and determination of mercury as its 2,2´ diamino-4,4´ bithiazole (DABTZ) complex by using octadecylsilica cartridges and spectrophotometry is presented. Extraction efficiency and the influence of flow rates of sample solution and eluent, pH, amount of DABTZ, type and least amount of eluent for elution of mercury complex from cartridges, break through volume and limit of detection were evaluated. Also the effects of various cationic and anionic interferences on percent recovery of mercury were studied. Average extraction efficiency >90% was obtained by elution of the cartridge with minimal amount of solvent in the presence of interferences. A preconcentration factor of 152 and a detection limit of 10.92 ng mL -1 were obtained. The method was applied to the recovery and determination of mercury in different water samples.

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Lead preconcentration onto C-18 minicolumn in continuous flow and its determination in biological and vegetable samples by flame atomic absorption spectrometry

Cited by 47 publications

References 17 publications

Determination of lead by hydride generation atom trapping flame atomic absorption spectrometry

Determination of lead by hydride generation atom trapping flame atomic absorption spectrometry

Immobilized stearic acid as a new sorbent for on-line preconcentration and determination of lead by flow injection flame atomic absorption spectrometry

DABTZ as a New Reagent for Solid Phase Extraction and Spectrophotometric Determination of Trace Amount of Hg(II) in Water Sample

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