Determination of Fluoride in Mouthwash Using Flow-injection Analysis with Spectrophotometric Detection

ISSN: 1875-676X (Online)
ISSN: 1573-4129 (Print)

Volume 11, 4 Issues, 2015

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Current Pharmaceutical Analysis

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Anastasios Economou
Department of Chemistry
Laboratory of Analytical Chemistry
University of Athens

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Determination of Fluoride in Mouthwash Using Flow-injection Analysis with Spectrophotometric Detection

Current Pharmaceutical Analysis, 10(3): 208-214.

Author(s): Benedito Roberto de Alvarenga, Wesley Lira Gabriel, Denílson Mendes de Oliveira, Cesar Reis, Reinaldo Francisco Teofilo, Vagner Bezerra dos Santos and Willian Toito Suarez.

Affiliation: Departamento de Quimica, Universidade Federal de Vicosa - UFV, Centro de Ciencias Exatas e Tecnologia, 36570-900, Viçosa, MG, Brazil.


In this work, the development of flow system that is simple, precise and accurate for determining fluoride in mouthwash is described. The determination of fluoride was based on the on-line formation of a Fe(III)–salicylate complex, which is consumed in the presence of fluoride, generating the colourless hexafluoroferrate(III) complex ion, [FeF6]3-. The proposed procedure exhibits a linear concentration range of 8.0 × 10-5–1.2 × 10-3 mol L-1, a detection limit of 3.5 x 10-5 mol L-1, a higher sampling frequency of 44 h-1 and relative standard deviations below 0.2%. The interference of the red colour of the samples was removed using waste-seed specimens of Mabea fistulifera Mart. as a biosorbent material.


Biosorbent material, flow injection analysis, fluoride, hexafluoroferrate(III) complex, mouthwash, spectrophotometry.

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Article Details

Volume: 10
Issue Number: 3
First Page: 208
Last Page: 214
Page Count: 7
DOI: 10.2174/1573412910666140602232739

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