?SPECTROPHOTOMETRIC DETERMINATION OF PA-LLADIUM (II) WITH RUBEANIC ACID (RA) IN PRESENCE OF PYRIDINE, PIPERIDINE AND 3-PICOLINE. Biological Sciences - PJSIR, [S. l.], v. 42, n. 4, p. 173–176, 1999. Disponível em: https://v2.pjsir.org/index.php/biological-sciences/article/view/2145. Acesso em: 10 mar. 2026.