Document Detail


Direct determination of potentially toxic elements in rice by SS-GF AAS: development of methods and applications.
MedLine Citation:
PMID:  23763652     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The development of methods for direct determinations of Al, Cd and Pb in rice by SS-GF AAS is presented. Heating program optimization associated with the use of an adequate chemical modifier containing Pd + Mg allowed direct analysis against aqueous calibrations. The obtained LOD were 114.0 µg kg-1, 3.0 µg kg-1 and 16.0 µg kg-1 for Al, Cd and Pb, respectively. Important parameters associated with a solid sampling analysis were investigated, such as minimum and maximum sample mass size and analyte segregation. Seventeen rice samples available in São Paulo City were analysed and all of them presented analyte mass fractions less than the maximum allowed by legislation. The influences of rice washing and the cooking procedure were also investigated. The washing procedure diminished the Al and Pb total mass fractions, indicating an exogenous grain contamination. The cooking procedure diminished the Cd total mass fraction. Rice cooking using an aluminium container did not cause a significant increase in the Al mass fraction in the rice, indicating no translocation of this element from container to food. In general, coarse rice presented higher levels of Al when compared with polished or parabolized rice.
Authors:
Daniel Meneszes Silvestre; Cassana Seimi Nomura
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-6-13
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2013 Jun 
Date Detail:
Created Date:  2013-6-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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