Research Article

• The Effect Of Ammonium Salt Variation On Natural Zeolite Acidity In Catalytic Cracking Of Waste Cooking Oil

  Verry A. Fabiani, Imelda H. Silalahi, Endah Sayekti

  413-418

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• Adsorption of Hg(II) By Using Sargassum crassifolium with Presence of Pb(II), Cu(II) And Fe(II)

  Nurhadini nurhadini, Imelda H. Silalahi

  419-423

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