@misc{eprints14045,
           month = {Oktober},
           title = {PEMANFAATAN SENYAWA EKSTRAK KULIT BUAH MANGGIS
(G. mangostana L.) SEBAGAI INHIBITOR KERAK KALSIUM KARBONAT (CaCO3) DENGAN MENGGUNAKAN METODE SEEDED EXPERIMENT},
          author = {1117011034 Mely Antika},
         address = {UNIVERSITAS LAMPUNG},
       publisher = {FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM},
            year = {2015},
             url = {http://digilib.unila.ac.id/14045/},
        abstract = {In this research, it has been conducted the addition of inhibitor compounds mangosteen peel extract on the calcium carbonate (CaCO3) scale using the addition of crystals seed (seeded experiment) at various concentrations of CaCO3 growth solutions from 0,075; 0,100 and 0,125 M and at various concentrations of inhibitors added were around 50, 150, and 250 ppm.
The results based on a qualitative analysis using optical microscopy and scanning electron microscopy (SEM) showed that the morphology of the surface of CaCO3 scale without inhibitor is bigger than the addition of inhibitors whereas quantitative analysis using a particle size analyzer (PSA) showed that the particle size distribution of CaCO3 scale becomes smaller with the addition of inhibitor which have different number based on mean is 0,958 {\ensuremath{\mu}}m and median is 0,331 {\ensuremath{\mu}}m. Based on a percentage (\%) of inhibitor ability, the optimum concentration of inhibitor in inhibiting of scale formation CaCO3 in the growth solution of 0,100 M is 150 ppm with the effectiveness of 30.78\%.
Keywords: CaCO3, inhibitors, mangosteen peel extract, scale.

Dalam penelitian ini telah dilakukan penambahan inhibitor senyawa ekstrak kulit manggis pada kerak kalsium karbonat (CaCO3) menggunakan metode penambahan bibit kristal (seeded experiment) pada konsentrasi larutan pertumbuhan CaCO3 sebesar 0,075; 0,100; dan 0,125 M serta variasi inhibitor dari 0, 50, 150, dan 250 ppm.
Hasil penelitian berdasarkan analisis kualitatif menggunakan mikroskop optik dan scanning electron microscopy (SEM) menunjukkan bahwa morfologi permukaan kerak CaCO3 tanpa inhibitor lebih besar dibandingkan dengan penambahan inhibitor sedangkan analisis kuantitatif menggunakan particle size analyzer (PSA) menunjukkan bahwa distribusi ukuran partikel kerak CaCO3 menjadi lebih kecil dengan adanya penambahan inhibitor dengan pergeseran berdasarkan nilai rata-rata yaitu sebesar 0,958 {\ensuremath{\mu}}m dan nilai tengah sebesar 0,331 {\ensuremath{\mu}}m. Berdasarkan persentase (\%) kemampuan menghambat, konsentrasi optimum inhibitor dalam menghambat kerak CaCO3 0,100 M yaitu pada konsentrasi 150 ppm dengan efektivitas sebesar 30,78\% .
Kata kunci : CaCO3, Ekstrak kulit manggis, inhibitor, kerak.}
}