Influence of slurry preparation on the accuracy of ultrasonic slurry electrothermal atomic absorption spectrometry

Miller-Ihli, Nancy J.

doi:10.1039/ja9940901129

Cited by 99 publications

(61 citation statements)

References 7 publications

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“…The density and the diameter of particles can be the most relevant factors, because these data are used to calculate the number of particles in suspension. When particle size decreases, there will be more particles in suspension, thus sampling errors will be reduced 30 . A compromise situation must be reached because if the mass of the slurry is too high, the matrix effect will affect the analytical signal.…”

Section: Stability Of the Slurrymentioning

confidence: 99%

“…A compromise situation must be reached because if the mass of the slurry is too high, the matrix effect will affect the analytical signal. Some researchers have reported the necessity of small particle size (< 25 µm) 30 for slurry analysis. The particles size of krill samples (vial N° 1070)…”

Section: Stability Of the Slurrymentioning

confidence: 99%

“…There are several critical factors in slurry preparation that must be taken into account, such as, the stability and maximum concentration of the slurry, the particle diameter and the density of the material 30 . The density and the diameter of particles can be the most relevant factors, because these data are used to calculate the number of particles in suspension.…”

Section: Stability Of the Slurrymentioning

confidence: 99%

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Direct analysis of Antarctic krill by slurry sampling: determination of copper, iron, manganese and zinc by flame atomic absorption spectrometry

Alves¹,

Smichowski²,

Farías³

et al. 2000

J. Braz. Chem. Soc.

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A técnica de amostragem de suspensão aliada à espectrometria de absorção atômica com chama foi empregada para a determinação direta de Cu, Fe, Mn e Zn em matrizes de Krill antártico. O efeito dos parâmetros instrumentais e o preparo das suspensões foram estudados em função do sinal analítico. Para a determinação de Cu, Fe e Zn, as amostras foram suspensas em uma solução de HNO 3 2,0 mol L -1 e para a determinação de Mn, o krill foi suspenso em uma solução de HNO 3 4,0 mol L -1 . A precisão entre as replicas foi melhor que 5 %. A metodologia foi aplicada para a determinação direta de Cu, Fe, Mn e Zn em amostras de krill antártico, usando padrões aquosos no preparo das curvas analíticas. Os resultados obtidos estão concordantes com os encontrados na determinação por FAAS e ICP-AES, depois da digestão das amostras em um forno de microondas. Os limites de detecção foram 4,5; 1,0; 4,9 e 8,4 µg L -1 para Cu, Zn, Mn e Fe, respectivamente.Slurry sampling in combination with flame atomic absorption spectrometry was employed for the direct determination of four essential trace elements, namely Cu, Fe, Mn and Zn in Antarctic krill. The effect of instrumental operating conditions and slurry sampling preparation on the analytical signal was investigated. For the determination of Cu, Fe and Zn, samples were suspended in a solution containing 2 mol L -1 HNO 3 . In the case of Mn, 4 mol L -1 HNO 3 was necessary for the preparation of the slurry. The precision between sample replicates was better than 5%. The method was applied to the direct determination of Cu, Fe, Mn and Zn in Antarctic krill samples using aqueous reference solutions to prepare the calibration curves. The results obtained were in good agreement with those achieved by FAAS and ICP-AES after microwave-assisted wet digestion of the krill samples. The detection limits were 4.5, 1.0, 4.9 and 8.4 µg L -1 for Cu, Zn, Mn and Fe, respectively.

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Section: Stability Of the Slurrymentioning

confidence: 99%

Section: Stability Of the Slurrymentioning

confidence: 99%

Section: Stability Of the Slurrymentioning

confidence: 99%

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Direct analysis of Antarctic krill by slurry sampling: determination of copper, iron, manganese and zinc by flame atomic absorption spectrometry

Alves¹,

Smichowski²,

Farías³

et al. 2000

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

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“…Errors associated with slurry sampling can be minimised when working with small particles, concentrated slurries and narrow particle size distributions 24 . Considering the well-known fact that a large number of particles reduce sampling errors, it is advisable to obtain small particle size 25 . According to some authors, the use of particle sizes smaller than 25 µm leads to better results 25 .…”

Section: Particle Size and Stabilitymentioning

confidence: 99%

“…Considering the well-known fact that a large number of particles reduce sampling errors, it is advisable to obtain small particle size 25 . According to some authors, the use of particle sizes smaller than 25 µm leads to better results 25 . In this work particle sizes of 75, 63, 53, and 38 µm were studied after being obtained from stainless steel sieves.…”

Section: Particle Size and Stabilitymentioning

confidence: 99%

River Sediment Analysis by Slurry Sampling FAAS: Determination of Copper, Zinc and Lead

Alves¹,

Cadore²,

Jardim³

et al. 2001

J. Braz. Chem. Soc.

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Foi desenvolvido um procedimento experimental para a análise direta de sedimento. Com o emprego deste procedimento, foram determinados cobre, zinco e chumbo, e foram conseguidas recuperações quantitativas para esses metais com baixo custo e manipulação mínima das amostras. Foram investigadas a influência da concentração do ácido nítrico no preparo da suspensão, bem como o tamanho de partícula do sedimento. As suspensões do sedimento foram tratadas com ácido nítrico 6,0 mol L -1 e cloreto de amônio 2% (m/v), e sonicadas por 15 minutos em um banho de ultrasom antes da quantificação por espectrometria de absorção atômica com chama. Empregando essas condições, a porcentagem de recuperação para cobre, zinco e chumbo foram 96,4 ± 4,9; 97,0 ± 4,0 e 99,7 ± 4,0, respectivamente, empregando-se um material certificado de referência.An experimental procedure for direct sediment analysis was developed. Using this procedure, copper, zinc and lead were determined and quantitative recoveries for these metals were accomplished at a low cost and with minimal sample manipulation. The influence of the nitric acid concentration on the slurry preparation, as well as the sediment particle size was investigated. Sediment slurries were treated with 6.0 mol L -1 nitric acid and 2% (m/v) ammonium chloride, and sonicated for 15 minutes in an ultrasonic bath before quantification by flame atomic absorption spectrometry. Using these conditions for a certified reference material, the percentage of recovery for copper, zinc and lead were 96.4 ± 4.9, 97.0 ± 4.0 and 99.7 ± 4.0, respectively.

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Slurry Sampling Graphite Furnace Atomic Absorption Spectrometry in Environmental Analyses

Miller-Ihli

Baker

2000

Encyclopedia of Analytical Chemistry

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Slurry sampling graphite furnace atomic absorption spectrometry (GFAAS) is a powerful tool for the determination of trace elements in environmental samples owing to its high sensitivity, instrumental simplicity, and relatively low cost. In this technique, discrete aliquots of the slurry or suspension are deposited in a graphite tube and then electrically heated to produce atomic vapors. The absorption of the atomic vapor is measured, typically with a hollow cathode lamp (HCL) or electrodeless discharge lamp (EDL), to determine the amount of analyte present in the sample. To ensure that a representative portion of the slurry is injected into the furnace, the slurry must be stabilized or mixed immediately prior to analysis. Slurry sampling GFAAS detection limits (DLs) are typically in the range of 10 −2 to 1 part per million (pg absolute DLs). Precision (0.5–5%) and accuracy are also good, provided that proper guidelines for slurry preparation and instrument operation are followed, and samples are sufficiently homogeneous. An additional benefit of the technique is that matrix interferences are typically small; in fact, aqueous calibration standards are routinely used in the analysis of slurry samples. A limitation of slurry sampling GFAAS is that it is primarily a single‐element technique, although continuum source and sequential atomic absorption spectrometry (AAS) systems have been developed. Furthermore, the linear range is typically less than two orders of magnitude unless alternative wavelengths, or some other means of reducing sensitivity (e.g. minigas flow during atomization), are used. In addition, some environmental samples have to be ground if the sample is not in the proper form or if the analyte is not homogeneously distributed. Care must be taken during the grinding process to avoid contamination of the sample or fractional distribution of the analyte.

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Influence of slurry preparation on the accuracy of ultrasonic slurry electrothermal atomic absorption spectrometry

Cited by 99 publications

References 7 publications

Direct analysis of Antarctic krill by slurry sampling: determination of copper, iron, manganese and zinc by flame atomic absorption spectrometry

Direct analysis of Antarctic krill by slurry sampling: determination of copper, iron, manganese and zinc by flame atomic absorption spectrometry

River Sediment Analysis by Slurry Sampling FAAS: Determination of Copper, Zinc and Lead

Slurry Sampling Graphite Furnace Atomic Absorption Spectrometry in Environmental Analyses

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