Surface modification of poly(tetrafluorethylene) magnetic stirring bars with plasma of hexamethyldisiloxane and its applications in the stir bar sorptive extraction technique. Superficies y Vacio [Internet]. 2012 Mar. 15 [cited 2025 Dec. 16];25(1):49-55. Available from: https://www.superficiesyvacio.smctsm.org.mx/index.php/SyV/article/view/228