Abstract
The progress of coversion to biodegradable surfactants in Japan from 1967 to 1973 was studied, in practice, on determination of individual components of anionic surfactants present in raw municipal sewage. The determination of anionic surfactants was carried out by infra-red spectroscopy. In raw municipal sewage the ratio of biodegradable synthetic snionic surfactants in total synthetic anionic surfactants was about 30% in 1967, and increased year by year, and had exceeded 90% in 1973.
