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		Sahara, Emmy, 		Kartini, Ni Putu, AND 		Sibarani, James.
" PEMANFAATAN ARANG AKTIF DARI LIMBAH TANAMAN GUMITIR (Tagetes erecta) TERAKTIVASI ASAM FOSFAT SEBAGAI ADSORBEN ION Pb2+ DAN Cu2+ DALAM LARUTAN" <em>CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry)</em> [Online], Volume 5 Number 2 (22 December 2017)