<![CDATA[ABSTRAK Penelitian ini bertujuan untuk mengetahui waktu kontak optimum, dan kapasitas adsorpsi arang aktif kulit buah kakao terhadap Cr total. Penentuan kadar air dan kadar abu arang aktif kulit buah kakao menggunakan metode gravimetri, waktu kontak optimum menggunakan metode batch dengan variasi waktu yaitu 10, 20, 40, 60 dan 120 menit dan penentuan kapasitas adsorpsi menggunakan pola isotherm Freundlich dan Langmuir dengan variasi konsentrasi Cr 10, 25, 50, 75, dan 100 ppm. Banyaknya konsentrasi Cr total yang terserap diukur menggunakan Spektrofotometer Serepan Atom (SSA). Hasil penelitian yang diperoleh berupa kadar air sebesar 7,74%, dan kadar abu sebesar 8,76%. Waktu kontak optimum tercapai pada menit ke-40 dengan mengikuti pola isotherm Freundlich dengan kapasitas adsorpsi sebesar 0,0129 mg/g. Kata kunci: Adsorpsi, Arang aktif, Cr total, Kapasitas adsorpsi ABSTRACT The aims of this study was to know optimum contact time and adsorption capacity of cacao shell (Theobroma cacao L) activated charcoal towards total chromium (Cr). Determination of water and ash content use gravimetric method, optimum contact time use batch method with variation time of 10, 20, 40, 60 and 120 minutes, and adsorption capacity by use isotherm absorption of Freundlich and Langmuir with metal variation concentration of 10, 25, 50, 75, and 100 ppm. The amount of Cr total adsorpted was measured by using Atomic Absorption Spectrophotometers (AAS). The results of research obtained water content of 7.74% and ash content of 8,76%. The optimum contact time achieved in 40 minutes which follow isotherm absorption of Freundlich with adsorption capacity of 0,0129 mg/g. Keywords: Adsorption, Active charcoal, Cr total, Adsorption capacity]]>
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