Homogeneity determination of Cd in plastic CRMs using solid sampling atomic absorption spectrometry

Pauwels, J.; Hofmann, C; Grobecker, K. H.

doi:10.1007/bf00326335

Cited by 16 publications

(5 citation statements)

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“…18 H E is frequently selected as a homogeneity indicator in reference material evaluation and production. 19,20 The M value mainly depends on the reference material's uncertainty, the relative standard deviation (RSD) of all measurements, and the number and weight of the subsamples. Rossbach and Grobecker 11 applied the Pauwels equation to assess the minimum sample mass of the International Atomic Energy Agency (IAEA) lichen candidate reference material for Cd and Pb measured by solid sampling AAS (SS-AAS).…”

Section: ■ Introductionmentioning

confidence: 99%

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Assessment of Homogeneity and Minimum Sample Mass for Cadmium Analysis in Powdered Certified Reference Materials and Real Rice Samples by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

Mao

Liu

Huang

et al. 2013

J. Agric. Food Chem.

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To optimize analytical quality controls of solid sampling electrothermal vaporization atomic fluorescence spectrometry (SS-ETV-AFS), the homogeneity (H(E)) of rice samples and their minimum sample mass (M) for cadmium analysis were evaluated using three certified reference materials (CRMs) and real rice samples. The effects of different grinding degrees (particle sizes <0.85, <0.25, <0.15, and >1 mm) on H(E) and M of real rice samples were also investigated. The calculated M values of three CRMs by the Pauwels equation were 2.19, 19.76, and 3.79 mg. The well-ground real rice samples (particle size <0.25 mm) demonstrated good homogeneity, and the M values were 3.48-4.27 mg. On the basis of these results, the Cd concentrations measured by the proposed method were compared with the results by microwave digestion graphite furnace atomic absorption spectrometry with a 0.5 g sample mass. There was no significant difference between these two methods, which meant that SS-ETV-AFS could be used to accurately detect Cd in rice with several milligrams of samples instead of the certified value (200 mg) or the recommended mass (200-500 mg) of the methods of the Association of Official Analytical Chemists.

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Section: ■ Introductionmentioning

confidence: 99%

“…Hence, Kurfürst et al introduced relative homogeneity factors ( H E ) to quantify the homogeneity of an element in a certain matrix on the basis of a modification of the Ingamells sampling constant K S , …”

Section: Introductionmentioning

confidence: 99%

Assessment of Homogeneity and Minimum Sample Mass for Cadmium Analysis in Powdered Certified Reference Materials and Real Rice Samples by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

Mao

Liu

Huang

et al. 2013

J. Agric. Food Chem.

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“…In the rapid expansion of analytical fields such as environmental, biological and material monitoring for trace metals there is an increasing need to develop simple, sensitive and selective analytical techniques that do not use expensive or complicated test equipment. Many sensitive techniques, such as spectrofluorimetry, X-ray fluorescence spectrometry, neutron activation analysis, atomic absorption spectrometry, chemiluminescence analysis and the like have been widely applied to the determination of cobalt [1,2,3,4,5,6,7]. The spectrophotometric method still has its advantages -it is simple and does not need expensive equipment.…”

Section: Introductionmentioning

confidence: 99%

Study of 2-(2-quinolinylazo)-5-dimethylaminobenzoic acid as a new chromogenic reagent for the spectrophotometric determination of cobalt

Zhong¹,

Yang²,

Wang³

et al. 2002

Anal Bioanal Chem

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2-(2-Quinolinylazo)-5-dimethylaminobenzoic acid (QADMAB) is proposed as a new sensitive and selective chromogenic reagent for spectrophotometric determination of cobalt. The QADMAB reacts with cobalt in the presence of cetyl trimethylammonium bromide (CTMAB) medium to form a violet complex of molar ratio 1:2 (cobalt to QADMAB) in the pH range 3.2-5.2. The molar absorptivity of the complex is 1.28x10(5) L mol(-1) cm(-1) at 625 nm. Beer's law is obeyed in range 0.01-0.32 micro g mL(-1). The relative standard deviation for eleven replicate samples of 0.2 micro g mL(-1) is 0.76%. This method was applied to the determination of cobalt in biological samples, Vitamin B(12), alloys and water with good results.

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“…The graphite was then reactivated during a 2500 0 C cleanout stage. The sequestration technique was applied to determinations of Ge (473) and Se in urine (381). There were several reports of fundamental studies of atomization processes in HGAAS.…”

Section: Vapor-phase Sample Introductionmentioning

confidence: 99%

Atomic Absorption, Atomic Emission, and Flame Emission Spectrometry

Jackson¹,

Mahmood²

1994

Anal. Chem.

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Homogeneity determination of Cd in plastic CRMs using solid sampling atomic absorption spectrometry

Cited by 16 publications

References 1 publication

Assessment of Homogeneity and Minimum Sample Mass for Cadmium Analysis in Powdered Certified Reference Materials and Real Rice Samples by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

Assessment of Homogeneity and Minimum Sample Mass for Cadmium Analysis in Powdered Certified Reference Materials and Real Rice Samples by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

Study of 2-(2-quinolinylazo)-5-dimethylaminobenzoic acid as a new chromogenic reagent for the spectrophotometric determination of cobalt

Atomic Absorption, Atomic Emission, and Flame Emission Spectrometry

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