Determination of Traces of Fluoride Ion in Carbonate Minerals by Ion Chromatography

Abstract

When less than 100mg of powdered carbonate mineral sample was stirred with an aqueous suspension of H⁺type resin (2cm³ resin in 5cm³suspension), F^-in the sample was quantitatively extracted into the aqueous phase. The ion chromatographic analysis of the aqueous phase enabled us to determine F^- in the sample at the μg g^-1 levels with precision of 5% relative standard deviation. The lower limit of determination was 0.2μg g^-1 when 100mg of sample was used. This method was applied to F^-determination in the Geochemical Standards Limestone (JLs-1) and Dolomite (JDo-1) issued from the Geological Survey of Japan.