Study of Mass Variation of Rice Husk Ash Adsorbent on the Ability to Adsorb Heavy Metal Ions in Low-Grade Nickel Soils. Kainawa: Jurnal Pembangunan dan Budaya, [S. l.], v. 6, n. 2, p. 127–137, 2024. DOI: 10.46891/. Disponível em: https://jurnal.kainawa.id/index.php/knw/article/view/81.. Acesso em: 8 feb. 2026.