Little is known of Trinidad Salinas Ferrer’s early life, but she initially trained as a primary school teacher before she moved to Madrid. At Madrid, she studied under José Casares (1866-1961), a professor of chemistry at the University of Madrid, before graduating with honors in pharmacy in 1926.
Ferrer’s PhD dissertation focused on fluorine, specifically its quantitative analyses and their applications to various animal products. In 1935, she collaborated with Casares on an article surrounding the quantitative determination of fluorine in organic substances. This article was published in the journal of the Spanish Academy of Science and was the only one of Casares’s 19 articles that Casares co-authored with a woman.