Cadmium and lead determination in foods by beam injection flame furnace atomic absorption spectrometry after ultrasound-assisted sample preparation

A simple method for cadmium and lead determination in foods by beam injection flame furnace atomic absorption spectrometry (BIFF-AAS) was proposed. Food slurries were prepared by transferring an exact amount of cryogenic-ground homogenized material (50–100 mg) to centrifuge tubes, followed by additi...

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Published inAnalytica chimica acta Vol. 512; no. 2; pp. 329 - 337
Main Authors Aleixo, Poliana Carolina, Júnior, Dário Santos, Tomazelli, Andréa Cristina, Rufini, Iolanda A, Berndt, Harald, Krug, Francisco José
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 11.06.2004
Elsevier
Subjects
Analytical chemistry
Beam injection flame furnace
BIFF-AAS
Cadmium
Chemistry
Exact sciences and technology
Food
GFAAS
Lead
Spectrometric and optical methods
Ultrasound extraction
Cadmium
Ultrasound extraction
Beam injection flame furnace
Lead
BIFF-AAS
GFAAS
Food
Trace analysis
Water
Beam injection
Sonication
Ultrasound extraction: Food
Lead: Beam injection flame furnace
Foodstuff
Certified reference material
Nitric acid
Flame spectrometry
Sample preparation
Detection limit
Ultrasound
Cryogenic grinding
Atomic absorption spectrometry
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Summary:A simple method for cadmium and lead determination in foods by beam injection flame furnace atomic absorption spectrometry (BIFF-AAS) was proposed. Food slurries were prepared by transferring an exact amount of cryogenic-ground homogenized material (50–100 mg) to centrifuge tubes, followed by addition of 5 ml (up to 2.8 mol l −1) nitric acid solution and sonication in an ultrasonic bath during 5–10 min. Thereafter, slurries were diluted with water to 10 ml, centrifuged during 5 min at 5400 rpm and 400 μl aliquot of the supernatant was analyzed by BIFF-AAS. The detection limits based on peak height measurements were 0.03 μg g −1 Cd and 1.6 μg g −1 Pb for 2% (m/v) slurry (200 mg/10 ml). For method validation, the certified reference materials Pig Kidney (BCR 186) and Rice Flour (NIES 10) were used. Quantitative cadmium and lead recoveries were obtained and no statistical differences were found at 95% level by applying the t-test.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0003-2670
1873-4324
DOI:10.1016/j.aca.2004.02.049