1. Osaka Municipal Technical Research Institute 1-6-50 Morinomiya, Joto-ku Osaka 536, Japan Kansai Research Establishment Japan Atomic Energy Research Institute 25-1 Mii-minamimachi, Neyagawa Osaka 572, Japan Department of Applied Chemistry College of Engineering Osaka Prefecture University 1-1 Gakuen-cho, Sakai, Osaka 593, Japan