MOHAMAD, S.; RADZI ABAS, M. Enrichment of Cu, Zn and Cd by Solid-Phase Extraction using Silica Gel Chemically Modified with Hydroxamic Acid Prior to Their Determination by Flame Atomic Absorption Spectrometry. Malaysian Journal of Science, [S. l.], v. 24, n. 2, p. 65–70, 2005. Disponível em: https://mjs.um.edu.my/index.php/MJS/article/view/8330. Acesso em: 13 may. 2024.