“Performance Test of Residu Powder Distillation from Fermentation Result Cocoa Fruits (Theobroma Cacao L.) as Adsorbent For Metal Ions (Cr3+, Fe3+, Pb2+)” (2025) International Journal of Science Technology and health, 2(1), pp. 8–14. doi:10.63441/ijsth.v2i1.6.