A critical survey of hydride generation techniques in atomic spectroscopy (Technical Report)

Campbell, A. D.

doi:10.1351/pac199264020227

Cited by 91 publications

(24 citation statements)

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“…HG is a preferred technique when hydride-forming elements are to be analysed by atomic spectrometry. 33,34 The advantage of volatilisation as a gaseous hydride clearly lies in the separation and enrichment of the analyte element and thus in a reduction or even complete elimination of interferences. In a well designed system 100% transfer of the analyte to the detector can be achieved.…”

Section: Hydride-forming Elementsmentioning

confidence: 99%

Atomic Fluorescence Spectrometry: a suitable detection technique in speciation studies for arsenic, selenium, antimony and mercury

Sánchez-Rodas

Corns

Chen

et al. 2010

J. Anal. At. Spectrom.

250

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Atomic Fluorescence Spectrometry (AFS) is an ideal detection technique for speciation studies concerning hydride forming elements (mainly As, Se and Sb) and Hg. The analytical features of AFS, such as detection limits below the mg L À1 and the wide linear calibration range, up to the mg L À1, allow its application to a great variety of environmental, biological and food samples. AFS represents a suitable alternative to other atomic spectrometers commonly employed in speciation studies such as Atomic Absorption Spectrometry (AAS) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The instrumentation used for AFS and the design of the vapour generation and optical layouts required to sustain the full benefits of the AFS approach are also described. The present review explains and comments on the instrumental couplings of chromatographic (HPLC and GC) and nonchromatographic separations (CE) with AFS detection, with online hydride generation for the speciation of inorganic and organic compounds of As, Se and Sb, and cold vapour for Hg. Other optional intermediate steps are online photo-oxidation (UV), pyrolysis or Microwave Assisted Digestion (MAD) for non-directly reducible compounds. Many different sample types (e.g. water, soils, air, biota, food) have been analysed using these instrumental couplings with AFS detection. These are summarised and discussed.

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Section: Hydride-forming Elementsmentioning

confidence: 99%

Atomic Fluorescence Spectrometry: a suitable detection technique in speciation studies for arsenic, selenium, antimony and mercury

Sánchez-Rodas

Corns

Chen

et al. 2010

J. Anal. At. Spectrom.

250

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“…[24][25][26] Hydrochloric and acetic acids are among the most used acids for this purpose. In this work different concentrations of acetic acid and hydrochloric acid were tested for sample acidification prior to the addition of NaBH 4 .…”

Section: Effect Of Acid Type and Concentrationmentioning

confidence: 99%

Headspace microextraction of tin into an aqueous microdrop containing pd(II) and tributyl phosphate for its determination by ETAAS

Hashemi¹,

Rahimi²,

Ghiasvand³

et al. 2007

J. Braz. Chem. Soc.

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O estudo introduz um método para microextração por headspace (HS-SME) de hidreto de estanho em uma microgota aquosa contendo Pd(II) e tributil fosfato (TBP) como uma estratégia de enriquecimento e de modificação de matriz previamente à determinação por ETAAS. O hidreto de estanho foi gerado pela adição de um volume fixo de solução de borohidreto de sódio na amostra. Os efeitos de vários parâmetros, tais como volume da amostra, quantidade de NaBH 4 , Pd(II) e TBP na gota, tipo de ácido e concentração na amostra, tempo de extração e volume da gota, foram cuidadosamente estudados. Possíveis interferências causadas por concomitantes foram testadas e nenhum efeito significativo foi gerado por hidretos formados por outros elementos. Concentrações salinas de até 0,3 mol L -1 foram toleradas pelo método HS-SME, porém aumentos drásticos nos sinais de absorbância e de fundo ocorreram em um método de injeção direta. O HS-SME mostrou-se um método sensível para determinação de estanho com um limite de detecção de 2,09 ng mL -1 e uma precisão melhor do que 4,04% (RSD). O método foi aplicado com sucesso para a determinação de estanho em águas residuais e suspensões.The study introduces a method for headspace solvent microextraction (HS-SME) of tin hydride into an aqueous microdrop containing Pd(II) and tributyl phosphate (TBP) as an enrichment and matrix modification method prior to ETAAS determination. The tin hydride was generated by injection of a fixed volume of sodium tetrahydroborate solution into the sample. Effects of several parameters including sample volume, amount of added NaBH 4 , Pd(II) and TBP concentrations in the drop, acid type and concentration in the sample, extraction time and drop volume were carefully studied. Possible interferences from a number of elements were tested and no significant interference from hydrides of other elements was observed. Salt concentrations up to 0.3 mol L -1 was tolerated by the HS-SME method while it drastically increased the background and signal absorbances in a direct injection method. The HS-SME resulted in a relatively sensitive tin determination method with a detection limit of 2.09 ng mL -1 and a precision better than 4.04% (RSD). The method was successfully applied to the determination of tin in waste water and slurry samples.

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“…This is mainly due to the high analyte transport efficiency and efficient atomization of the hydrides. [1][2][3] Furthermore, the HG technique has a high sensitivity; few atomization interferences are encountered. This is a device friendly used to be adapted to many atomization sources and is also used for preconcentration and speciation studies.…”

Section: Introductionmentioning

confidence: 99%

“…This is a device friendly used to be adapted to many atomization sources and is also used for preconcentration and speciation studies. The main disadvantages in hydride generation, are the interferences effects caused by transition metals ions in solution [1][2][3][4][5][6][7] and the group of elements training of hydrides a high concentrations. 6,7 The interference effect and the mechanisms of analyte signal suppression by transition metals have been widely studied in AAS.…”

Section: Introductionmentioning

confidence: 99%

“…6,7 The interference effect and the mechanisms of analyte signal suppression by transition metals have been widely studied in AAS. [1][2][3][4][5][8][9][10][11][12][13][14][15] It has been reported that transition metals interfere in the hydride formation process after being reduced to metals 1,4,14 or after being converted to metal borides. 9,15 A catalytic effect of Co 2+ , Ni 2+ and Cu 2+ ions on the aerosol, during the decomposition of NaBH 4 in the hydride generation process 12 and transport to the atom cell 14 as well as the deterioration of the tubes during the atomization step 16 have been reported as sources of interferences.…”

Section: Introductionmentioning

confidence: 99%

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Design and evaluation of a continuous flow, integrated nebulizer-hydride generator for flame atomic absorption spectrometry

Murillo¹,

Carrión²,

Colmenares³

et al. 2008

Quím. Nova

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Recebido em 17/4/07; aceito em 29/2/08; publicado na web em 13/8/08An evaluation of the performance of a continuous flow hydride generator-nebulizer for flame atomic absorption spectrometry was carried out. Optimization of nebulizer gas flow rate, sample acid concentration, sample and tetrahydroborate uptake rates and reductant concentration, on the As and Se absorbance signals was carried out. A hydrogen-argon flame was used. An improvement of the analytical sensitivity relative to the conventional bead nebulizer used in flame AA was obtained (2 (As) and 4.8 (Se) µg L -1 ). Detection limits (3 b) of 1 (As) and 1.3 (Se) µg L -1 were obtained. Accuracy of the method was checked by analyzing an oyster tissue reference material

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A critical survey of hydride generation techniques in atomic spectroscopy (Technical Report)

Abstract: Abstract

Cited by 91 publications

References 0 publications

Atomic Fluorescence Spectrometry: a suitable detection technique in speciation studies for arsenic, selenium, antimony and mercury

Atomic Fluorescence Spectrometry: a suitable detection technique in speciation studies for arsenic, selenium, antimony and mercury

Headspace microextraction of tin into an aqueous microdrop containing pd(II) and tributyl phosphate for its determination by ETAAS

Design and evaluation of a continuous flow, integrated nebulizer-hydride generator for flame atomic absorption spectrometry

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