Publication Date:
2011-06-21
Description:
This work describes the evaluation of several parameters for the preparation of a tuna fish candidate as a reference material (RM) in order to measure the total As mass fraction by slurry sampling graphite furnace atomic absorption spectrometry (SLS-GF AAS) and slurry sampling hydride generation atomic absorption spectrometry (SLS-HG AAS). The main parameters investigated were the homogeneity, analyte segregation and composition during material production. For candidate RM preparation, tuna fish was collected at a local market, cleaned, freeze-dried and treated using different procedures as follows: (1) ground in a cutting mill and separated in different particle sizes (2) ground in cryogenic mill. The mass fraction of As in the cryogenically ground sample was (4.77 ± 0.19) μg g −1 for SLS-GF AAS and (4.61 ± 0.34) μg g −1 for SLS-HG AAS. The accuracy of the procedures was checked with tuna fish certified reference material (BCR 627) with recoveries of 102 and 94% for SLS-GF AAS and SLS-HG AAS, respectively. The homogeneity factor was calculated for different pretreatment procedures and for particle sizes in the range of 500–150 μg, indicating good homogeneity, except for raw fish. There was no observed analyte segregation and no losses, no contamination and no changes in the microdistribution of material during preparation. Content Type Journal Article Pages 1-6 DOI 10.1007/s00769-011-0796-8 Authors V. M. O. Carioni, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP 09210-170, Brazil R. Chelegão, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP 09210-170, Brazil J. Naozuka, Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Diadema, SP 09972-270, Brazil C. S. Nomura, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP 09210-170, Brazil Journal Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement Online ISSN 1432-0517 Print ISSN 0949-1775
Print ISSN:
0949-1775
Electronic ISSN:
1432-0517
Topics:
Chemistry and Pharmacology
