Document Detail


Optimization of a chemical modifier in the determination of selenium by graphite furnace atomic absorption spectrometry and its application to wheat and wheat flour analysis.
MedLine Citation:
PMID:  15732473     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A method for the determination of total selenium in wheat and wheat flour using graphite furnace atomic absorption spectrometry (GFAAS) with palladium/ascorbic acid as a chemical modifier was studied. The effects of nickel nitrate, palladium/ascorbic acid, and palladium/magnesium nitrate as chemical modifiers on the sensitivity in the determination of selenite, selenate and selenomethionine by GFAAS were compared. The palladium/ascorbic acid modifier was used for the determination of total selenium in wheat and wheat flour, because the oxidation states of the selenium ion are not important in the determination. The detection limit was estimated to be 1 microg L(-1) (calculated as 3sigma of the blank); the calibration curve was linear for the concentration range 5 - 50 microg L(-1) and the recovery range was 96.66 - 101.80%. The optimal ashing and atomizing temperatures were 1300 degrees C and 2250 degrees C, respectively. The proposed method was successfully applied to the determination of total selenium in wheat and wheat flour.
Authors:
Viorica Alexiu; Luminita Vladescu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Analytical sciences : the international journal of the Japan Society for Analytical Chemistry     Volume:  21     ISSN:  0910-6340     ISO Abbreviation:  Anal Sci     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-02-28     Completed Date:  2006-05-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8511078     Medline TA:  Anal Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  137-41     Citation Subset:  IM    
Affiliation:
Magistra C&C, 9th, Aviator Belghiru Street, 900133, Constanta, Romania. viomih@yahoo.com
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MeSH Terms
Descriptor/Qualifier:
Ascorbic Acid / chemistry
Flour / analysis*
Magnesium Compounds / chemistry
Nickel / chemistry
Nitrates / chemistry
Palladium / chemistry
Romania
Selenium / analysis*,  chemistry
Spectrophotometry, Atomic / methods*
Triticum / chemistry*
Chemical
Reg. No./Substance:
0/Magnesium Compounds; 0/Nitrates; 10377-60-3/magnesium nitrate; 13138-45-9/nickel nitrate; 50-81-7/Ascorbic Acid; 7440-02-0/Nickel; 7440-05-3/Palladium; 7782-49-2/Selenium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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