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Artificial waste is made using chrome metal from K2Cr2O7 crystals, nickel from NiSO4.6H2O crystals and copper from CuSO4.5H2O crystals. The purpose of this study was to determine the utilization of grapefruit skin extracts and powders in reducing the levels of chromium and cadmium. This research was carried out using artificial waste mixed with grapefruit peel extract and powder with a concentration of 0%, 0.5%, 1%, 1.5% and 2%. Metal content was measured using the Atomic Absorption Spectrophotometry method. The results of the research on chromium content before the treatment were 46.49 ppm and after the treatment using powder levels with a concentration of 0.5%; 1%; 1.5% and 2%, namely 29.97 ppm, 33.20 ppm, 31.05 ppm, 33.76 ppm, while the levels of extract are 40.43 ppm, 41.94 ppm, 42.34 ppm and 48 , 23 ppm. The results of the study of cadmium metal content before treatment were 102.36 ppm and after treatment using powder levels with variations in concentration of 0.5 %%; 1%; 1.5% and 2%, namely 33.61 ppm, 20.26 ppm, 13.44 ppm, 16.82 ppm, while the extracts are 75.45 ppm, 74.86 ppm, 80.66 ppm and 85 , 10 ppm. Keywords: artificial waste, grapefruitpeel, chromium, cadmium, atomic absorption spectrophotometry

Pemanfaatan Ekstrak dan Serbuk Kulit Jeruk Bali (Citrus Maxima Merr) untuk Mereduksi Kadar Krom(VI) dan Kadmium(II) pada Limbah Cair Artifisial