Yasuyuki GOTOH†, Masakazu TSUJI††, Sigeru SUGIMORI††† and Hideo SAITO*
Specialty Chemicals Research Center, Chisso Petrochemical Corporation; 5-1 Goikaigan, Ichihara-shi 290-8551 Japan † Chisso Corporation Minamata Factory Lixon Plant; 1-1,Noguchi-cho, Minamata-shi 867-0053 Japan †† Osaka Office Silicon Division, Chisso Corporation; Dai Bldg., 3-6-32, Nakanoshima, Kita-ku, Osaka 530-0005 Japan ††† Department of Industrial Chemistry, Toyama National College of Technology; 13, Hongo-cho, Toyama-shi 939-8045 Japan