Analytical Sciences

Determination of Fluorine Chemical Structure in Slag by Thermal Hydrolysis He-MIP-OES

Michihiro AIMOTO,*1 Shun-ichi HAYASHI,*1 Kazuko YAMAMOTO,*2 Masaki OHATA,*3 and Yukio OKAMOTO*4

*1 Advanced Technology Research Laboratories, Nippon Steel and Sumitomo Metal Corp., Futtsu, Chiba 293-8511, Japan
*2 Hitachi High-Tech Science Corp., Hitachinaka, Ibaraki 312-0033, Japan
*3 National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8567, Japan
*4 Research Institute of Industrial Technology, Toyo University, Kawagoe, Saitama 350-8585, Japan

A novel microwave-induced helium plasma optical emission spectrometry (He-MIP-OES) combined with a thermal hydrolysis sample introduction system was newly established for the determination of fluorine (F) compounds in slags. The MIP maintained through an Okamoto cavity was adopted, which was quite stable and provided a higher detection capability of F by helium plasma. The basic analytical performance of He-MIP-OES combined with an ultrasonic nebulizer for F analysis was also examined, and expected results could be obtained. The thermal hydrolysis behavior of CaF₂, Ca₄(Si₂O₇)(F,OH)₂ and Ca₅(PO₄)₃F, as known F chemical structures in slag, was also examined by thermal hydrolysis He-MIP-OES; F compounds in actual slag could be successfully identified and determined by this developed system.

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