The Analysis of Low-Cost Pb(II) Adsorbents using Batch Method of Solid-Phase Spectrophotometry. Jurnal Kimia Valensi, [S. l.], v. 7, n. 1, p. 38–45, 2021. DOI: 10.15408/jkv.v7i1.18363. Disponível em: https://journal.uinjkt.ac.id/valensi/article/view/18363. Acesso em: 21 dec. 2025.