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Fluoride in acidic aqueous solution was extracted with chlorodimethylphenylsilane in cyclohezane and converted to fluorodiiethylphenylsilane, which was quantified by gas-liquid chromatography 0X) with flame ionization detection. The potential of GC, combined with different ashing procedures, including high pressure closed vessel acid digestion, to determine trace amounts of fluoride was evaluated with different biological standard reference materials. Major constituent elements such as Ca, Mg, Al and Si were also measured, but no correlation was apparent as to their effect on fluoride yields. Cluster analysis of fluoride yields with the various ashing methods revealed a difference between plant-and non-plant materials. Using alkaline fusion (KOH) for plant materials and a retaining agent (CaO) for non-plant materials good agreement with either certified or published values was obtained. The combination of both ashing aids gave satisfactory results regardless of the sample type. Application of this ashing method to Swiss total diet samples from the year 1983 and comparison with an ion-selective procedure in another laboratory yielded consistent results and identical mean values of 1

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Author

M. Haldimann; B. Zimmerli

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1993

Language

EN

Field

Chemistry (Physical Sciences)