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Flow injection potentiometric determination of saccharin in dietary products with relocation of filtration unit.

Authors
  • Fatibello-Filho, O
  • Nóbrega, J A
  • Moraes Guaritá-Santos, A J
Type
Published Article
Journal
Talanta
Publisher
Elsevier
Publication Date
May 01, 1994
Volume
41
Issue
5
Pages
731–734
Identifiers
PMID: 18965991
Source
Medline
License
Unknown

Abstract

A flow injection potentiometric procedure for saccharin determination in dietary products is proposed. Saccharin is precipitated as mercurous saccharinate and the excess of the mercurous cation is potentiometrically measured using a silver wire coated with a mercury film as the working electrode. A filter unit is used to avoid contact between the precipitate and the electrode surface. With relocation in the flow manifold, the accumulated precipitate is removed on-line. Sucrose, glucose, aspartame, sodium cyclamate and sodium benzoate do not interfere when present in amounts similar to those observed in commercial products. Results are comparable with those obtained by UV-spectrophotometry and the correlation coefficient between methods is equal to 0.9930. A linear relationship between DeltaE (mV) and the logarithm of saccharin concentration was obtained in the saccharin concentration range 2 x 10(-3) - 1 x 10(-2)M. The sampling frequency is 60/hour and only 0.76 mg of Hg(2+)(2) is consumed in each determination.

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