THE EDUCATIONAL AND METHODOLOGICAL SIGNIFICANCE OF SPECTROPHOTOMETRIC DETERMINATION OF NI(II) ION. Journal of Multidisciplinary Sciences and Innovations, [S. l.], v. 4, n. 8, p. 942–945, 2025. DOI: 10.55640/. Disponível em: https://ijmri.de/index.php/jmsi/article/view/2044. Acesso em: 27 feb. 2026.