Study the effect of metal cutting fluids in operating machines on opera-tor health and the environment. Periodicals of Engineering and Natural Sciences, [S. l.], v. 9, n. 2, p. 649–656, 2021. DOI: 10.21533/pen.v9.i2.770. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/770. Acesso em: 10 jun. 2026.