1. Division of Environmental Materials Science; Graduate School of Environmental Science; Hokkaido University; N10 W5 Sapporo 060-0810 Japan
2. Chemistry Department; Universitas Islam Indonesia; Kaliurang KM 14 5 Sleman Yogyakarta Indonesia
3. Environmental Science Research Laboratory; Central Research Institute of Electric Power Industry; 1646 Abiko, Abiko Chiba 270-1194 Japan
4. CERES, Inc.; 1-4-5 Midori, Abiko Chiba 270-1153 Japan