Determination of nickel, chromium and cobalt in wheat flour using slurry sampling electrothermal atomic absorption spectrometry

González, Mar; Gallego, Mercedes; Valcárcel, Miguel

doi:10.1016/s0039-9140(98)00317-8

Cited by 31 publications

(10 citation statements)

References 20 publications

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“…3b). González et al [14] and Carlosena et al [10] also reported this background absorbance enhancement when Mg(NO 3 ) 2 was used for Co determination in flour and vegetable slurries, respectively.…”

Section: Selection Of the Chemical Modifiermentioning

confidence: 84%

Chemical modifiers for direct determination of cobalt in coal combustion residues by ultrasonic slurry-sampling–ETAAS

Felipe-Sotelo

Carlosena

Fernández

et al. 2001

Fresenius J Anal Chem

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Five modifiers were tested for the direct determination of cobalt in coal fly ash and slag by ultrasonic slurry-sampling electrothermal atomic absorption spectrometry (USS-ETAAS). The furnace temperature programs and the appropriate amount for each modifier were optimized to get the highest signal and the best separation between the atomic and background signals. Nitric acid (0.5% v/v) was the most adequate chemical modifier for cobalt determination, selecting 1,450 degrees C and 2,100 degrees C as pyrolysis and atomization temperatures, respectively. This modifier also acts as liquid medium for the slurry simplifying the procedure. The remaining modifiers enhanced the background signal, totally overlapped with cobalt peak. The method optimized gave a limit of detection of 0.36 microg g(-1), a characteristic mass of 13 +/- 1 pg and an overall-method precision which is highly satisfactory (<7%, RSD). The method was validated by analyzing two certified coal fly ash materials, and satisfactory recoveries were obtained (83-90%) and no statistical differences were observed between the experimental and the certified cobalt concentrations. Additionally, certified sediment, soil and urban particulate matter were assayed; again good results were obtained. The developed methodology was used to determine cobalt in several coal combustion residues from five Spanish power plants.

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Section: Selection Of the Chemical Modifiermentioning

confidence: 84%

Chemical modifiers for direct determination of cobalt in coal combustion residues by ultrasonic slurry-sampling–ETAAS

Felipe-Sotelo

Carlosena

Fernández

et al. 2001

Fresenius J Anal Chem

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“…The slurry was then transferred into acid-cleaned (by use of 10% nitric acid, overnight) polypropylene autosampler cups and stirred with a vortex mixer at 60 rpm. Before pipetting the slurry was homogenized by magnetic stirring in the autosampler cup and the capillary was immersed approximately 10 mm below the surface of the slurry to avoid possible sedimentation errors [10,15]. Approximately 15 µL of the slurry and 5 µL of chemical modifier (total volume 20 µL) were then delivered into the atomizer.…”

Section: Slurry Preparationmentioning

confidence: 99%

“…In recent years the direct analysis of solids, particularly slurries, has received much attention in an attempt to eliminate problems associated with sample preparation by conventional wet acid digestion and dry-ashing; this is confirmed by the extensive literature published in the last decade on the application of slurry sampling to metal determination in biological [7,8,9,10,11,12,13,14,15] and inorganic solid samples [15,16,17,18,19]. Slurry sampling combines the advantages of direct solid sampling (reduced sample-preparation time, less sample contamination, minor analyte losses by volatilization or incomplete dissolution, etc.)…”

Section: Introductionmentioning

confidence: 99%

Determination of lead in biological samples by use of slurry sampling electrothermal atomic absorption spectrometry

Cid

Silva

Boia

2002

Analytical and Bioanalytical Chemistry

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Slurry-sampling electrothermal atomic absorption spectrometry has been applied to the determination of lead in several biological samples (fish and marine algae). The slurries were prepared both by magnetic shaking and microwave-heating and the effect of instrument operating conditions and slurry preparation conditions on the signal were examined. In addition, results from slurry sampling were compared with those obtained by microwave-assisted acid digestion of the same samples and no significant differences were found between them when the analysis of variance (ANOVA) was applied. The between-batch precision of the slurry techniques employed was similar to that for the microwave-assisted digestion procedure; values were always below 6.7%, except for the Dicentrarchus labrax sample for which the value obtained was 9.5% when using slurry magnetic shaking and 7.6% when using the slurry microwave heating. The accuracy of the slurry methodology employed was also evaluated by analysis of two biological reference materials (NIST-1577b and IAEA-V10); percentage recoveries obtained were between 95.6 and 98.5% of the values certified for lead.

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“…Nickel-ion quantification has been carried out using a wide number of different analytical techniques, such as ion chromatography [1], absorption spectrometry [2], capillary electrophoresis [3] and electrochemical techniques [4][5][6][7][8]. Of these, electrochemical techniques offer sensitive, inexpensive and rapid ways of trace metal determination and the possibility of being used in miniaturised and portable ion detecting devices.…”

Section: Introductionmentioning

confidence: 99%

Nickel-ion detection on a boron-doped diamond electrode in acidic media

Neodo

Nie

Wharton

et al. 2013

Electrochimica Acta

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Determination of nickel, chromium and cobalt in wheat flour using slurry sampling electrothermal atomic absorption spectrometry

Cited by 31 publications

References 20 publications

Chemical modifiers for direct determination of cobalt in coal combustion residues by ultrasonic slurry-sampling–ETAAS

Chemical modifiers for direct determination of cobalt in coal combustion residues by ultrasonic slurry-sampling–ETAAS

Determination of lead in biological samples by use of slurry sampling electrothermal atomic absorption spectrometry

Nickel-ion detection on a boron-doped diamond electrode in acidic media

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