The using of active carbon of coconut shell for adsorbing 32Pand 1311was based on the abundancy and cost of coconuts in Indonesia. Therefore, the influence of pH and temperature of feed solution on ability of active carbon of coconut shell adsorbing 32Pand 1311 has been studied. The -100+80 mesh coconut shell carbon was heated at 6000 C for 2 hours and activated with 1.75M of HN03 solution for 25 hours. Carbon was dried at 1200C for 1 hour. pH of solutions that consist of 0.5 g active carbon and 10 ml32P or 1311were varied on 5, 6,7,8 and 9.200 ul effluent form each sample was dried and counted by GM. Similar steps was done in varying feed temperatures on 400 C, 550C, 700C, and 850 C. The result of study shows that pH and feed temperature affect the adsorption of 32P and 1311.Adsorption decreases with increaasing of acidity or basidity of feed. So that, pH 7 of feed is the optimum pH. Adsorption also decreases with temperature increasing. The temperature of feed which gives the maximum Decontamination Factor (OF) is 270C. The Anion Exchange Capacity of coconut shell is very low compared to theoritical anion exchange capacity of resin. Keywords: pH, temperature, adsorption, active carbon, coconutSusetyo Hario Plltera, Widya Rosita; Fakultas Teknik, Universitas Gajah Mada Diah Hidayanti S. Badan Pengawas Tenaga Nuklir
