Rusmana, M.H.G. and Sulistyaningsih, T. 2022. Preparation of Magnetite-Tannin Guava Leaves as Pb(II) Adsorbent. Indonesian Journal of Chemistry and Environment. 4, 2 (Mar. 2022), 39–48. DOI:https://doi.org/10.21831/ijoce.v4i2.48400.