Performance Test of Residu Powder Distillation from Fermentation Result Cocoa Fruits (Theobroma Cacao L.) as Adsorbent For Metal Ions (Cr3+, Fe3+, Pb2+). Int J Sci Tech Health [Internet]. 2025 Jun. 28 [cited 2025 Oct. 2];2(1):8-14. Available from: https://jurnal.istekaisyiyah.id/index.php/ijsth/article/view/6