Document Detail


Microdiffusion and fluoride-specific electrode determination of fluoride in foods.
MedLine Citation:
PMID:  528449     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A simple and accurate method was developed for routine determination of fluoride in foods. Hydrogen fluoride is diffused 20 hr at 50 degrees C from fresh or freeze-dried samples (0.1 g dry wt) in polystyrene petri dishes containing 2 mL 40% HCIO4 and 0.3 g Ag2SO4, and is absorbed on the lids, previously spotted with 0.1 mL 0.5M NaOH. The absorbent layer is dissolved in 2 mL buffer solution, and the fluoride is measured potentiometrically. The method was verified by analysis of NBS Standard Reference Materials; recovery from 28 spiked infant foods (average = 99%, range = 75-135%); and comparison of results with colorimetry results for the same diffusates, after modification to handle 1 g samples. Relative standard deviations varied from 4 to 20% day to day. Detection limits were below 0.05 microgram/g dry weight.
Authors:
R W Dabeka; A D McKenzie; H B Conacher
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal - Association of Official Analytical Chemists     Volume:  62     ISSN:  0004-5756     ISO Abbreviation:  J Assoc Off Anal Chem     Publication Date:  1979 Sep 
Date Detail:
Created Date:  1980-04-26     Completed Date:  1980-04-26     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  7505559     Medline TA:  J Assoc Off Anal Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1065-9     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Colorimetry
Diffusion
Electrodes
Fluorides / analysis*
Food Analysis*
Freeze Drying
Microchemistry
Chemical
Reg. No./Substance:
0/Fluorides

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