Одесский национальный университет имени И. И. Мечникова
Between 1985 and 1988, Duca attended a postdoctoral training course at the Institute of Physical Chemistry of the Russian Academy of Sciences. In 1989 he obtained a habilitation in environmental protection sciences from Odessa University, with a thesis titled "Mecanismele proceselor eco-chimice în mediu acvatic" ("Mechanisms of ecological chemical processes in the aquatic environment").