Analytical Sciences

Differences of Fluorine in Cements Determined by Photometric Methods after Distillation and Pyrolysis

Yasunari NOGUCHI,* Toshihisa MARUTA,* Takeshi YAMANE,** and Nobutoshi KIBA***

*Research and Development Center, Taiheiyo Consultant Co., Ltd., 2-4-2 Osaku, Sakura 285-8655, Japan
**Faculty of Education and Human Sciences, University of Yamanashi, 4-3-37 Takeda, Kofu 400-8510, Japan
***Department of Applied Chemistry, Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu 400-8511, Japan

Using a spectrophotometric method after distillation separation is a standard test method widely employed for the determination of fluorine (F) in cement. Using a flow injection (FI) method after pyrolysis separation for quantification of fluorine in cement has recently been developed. Differences between the fluorine content values obtained by each method have been noted. This paper documents the differences between fluorine content (distillation F) measured spectrophotometrically after distillation and that (pyrolysis F) determined using the FI method after pyrolysis for fourteen commercial Portland cements and identifies a factor contributing to the differences between distillation F and pyrolysis F values. A highly significant relationship existed between distillation F and pyrolysis F values for fourteen cements (r² = 0.998, p < 0.001).

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