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Analysis of fluoride in toothpastes on the Belgian market

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Synopsis We developed a method for the quantitative determination of sodium fluoride (NaF), sodium monofluorophosphate (SMFP) and amine fluoride (AmF) in toothpastes on the Belgian market. Samples were suspended in water and the determination was made using anion chromatography with conductivity detection after chemical suppression. The described ion chromatographic method is an easy and reliable isocratic high-performance liquid chromatography method for the determination of total soluble fluoride content in toothpastes. The analytical repeatability and reproducibility, the matrix effects and the method’s decision limit of three different toothpastes containing NaF, SMFP and AmF at a concentration close to the permitted one of 0.15 g % total F are determined. All the samples analysed are in conformity with the Cosmetics Directive 76/768/EC; none exceeds the limit of 0.15 g %.

French
Résumé

Nous avons developpé une méthode pour la détermination quantitative du fluorure de sodium (NaF), du monofluorophosphate (SMFP) de sodium et de fluorure d’amine (AmF) dans les dentifrices du marché Belge. Les échantillons sont mis en suspension dans de l’eau et le dosage est effectué par chromatographie anionique avec une detection conductimétrique après une suppression chimique. La méthode decrite est une méthode HPLC isocratique facile et fiable pour la determination du contenu de fluorure soluble total dans les dentifrices. La répétabilité analytique et la reproducibilité, les effects de matrices et la limite de décision de 3 différents dentifrices contenant NaF, SMFP and AmF à une concentration proche de la limite de 0.15 g % total F permise sont déterminés. Tous les échantillons analysés sont conformes à la directive 76/768/CE et ne dépassent pas la limite de 0.15 g %.
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Keywords: anion chromatography; conductivity detection after chemical suppression; fluoride; toothpastes

Document Type: Research Article

Affiliations: 1: Scientific Institute of Public Health, Brussels 2: Federal Public Service of Public Health Food Chain Safety and Environment, Brussels, Belgium

Publication date: April 1, 2008

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