HASRA, P. R.; YANGTI, I.; GUSTI, H. I.; KARNENG, S. Characterization of Pineapple Peel Activated Carbon (Ananas comosus) as an Iron (Fe) Heavy Metal Adsorbent with NaOH and NH4OH Activators. Jurnal Beta Kimia, v. 5, n. 2, p. 33-40, 8 nov. 2025.