Study of Mass Variation of Rice Husk Ash Adsorbent on the Ability to Adsorb Heavy Metal Ions in Low-Grade Nickel Soils. Kainawa [Internet]. 2024 Nov. 29 [cited 2026 Feb. 8];6(2):127-3. Available from: https://jurnal.kainawa.id/index.php/knw/article/view/81