Evaluation Method of Emulsion Using Chemical Oxygen Demand Kaiki Amagu, Riho Okajima, Moe Shimizu, Makoto Nishimoto, Kazuhito Nagayama, Takashi Hata, Yusuke Nishiuchi and Kaori Tada MATEC Web Conf., 333 (2021) 11009 Published online: 08 January 2021 DOI: 10.1051/matecconf/202133311009