?EFFECT OF pH ON NI ADSQRPTION IN ORGi\.NO .•MINERAL COMPLEXES. Biological Sciences - PJSIR, [S. l.], v. 42, n. 2, p. 59–62, 1999. Disponível em: https://v2.pjsir.org/index.php/biological-sciences/article/view/2112. Acesso em: 10 mar. 2026.