Determination of Fluoride in Water Solutions by High-Resolution Molecular Absorption Spectrometry

Page: 663

Ľ. Machyňák, E. Beinrohr, M. Němeček, and F. Čacho

Institute of Analytical Chemistry, Faculty of Chemical and Food Technology, STU Bratislava

Keywords: fluorides, mineral water, molecular absorption spectrometry

 

Trace concentrations of fluoride in aquatic samples were determined by graphite furnace continuum source high-resolution molecular absorption spectrometry (HR CS GF MAS) by making use of the formation of diatomic SrF species. The influence of strontium concentration, ashing, and atomization temperatures were investigated. The detection limit and precision of the method are 30 µg L –1and 3.6 %, respectively. No spectral interferences were detected and chemical interferences were caused only by high chlorine concentrations. Analysis of certified reference material confirmed the accuracy of the method. The method was used for analysis of mineral waters.

 

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