1. Department of Chemistry, Kyushu Institute of Technology, Sensui-cho, Tobata-ku, Kitakyushu-shi 804, Japan, Shinnikka Environmental Engineering Company, Ltd., Nakabaru, Tobata-ku, Kitakyushu-shi 804, Japan, Faculty of Engineering, Kyushu Kyoritsu University, Jiyugaoka, Yahatanishi-ku, Kitakyushu-shi 807, Japan, and Asahi Kasei Kogyo Company, Ltd., Yako, Kawasaki-ku, Kawasaki-shi 210, Japan