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All Journal MASALIQ: Jurnal Pendidikan dan Sains Asian Journal of Science, Technology, Engineering, and Art
Lestari, Destriani Umi
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Religion Arts Computer Science & IT Education Engineering Social Sciences

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Pengaruh Media Terbuka dan Tertutup terhadap Kadar Asam Lemak Bebas pada Kondisi Suhu Kamar Lestari, Destriani Umi; Wicaksono, Dimas Aji
MASALIQ Vol 4 No 2 (2024): MARET
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v4i2.2752

Abstract

Free fatty acids (ALB) are fatty acids that exist in a free state and are no longer related to glycerol. The method used in ALB analysis in CPO uses the alkalimetric titration method with the principle of determining acid levels using a standard alkaline solution that has known the exact concentration. The data collection process is carried out by calculating the % ALB in open and closed media CPO which is then calculated in excel to find out the comparison of the increase in % ALB so that the graph is obtained. a significant increase occurs in open media CPO because open media is more rapidly oxidized and more susceptible to contamination by air so that there is a faster increase in open media samples so that in open media the smell is more rancid than closed media due to the result of oxidation, namely hydroperoxide which gives a rancid smell and gives a brownish color to CPO.
Sintesis Pigmen Merah Hematit (α-Fe2O3) dari Pasir Besi dengan Metode Kopresipitasi dan Hidrotermal: A Review Lestari, Destriani Umi
Asian Journal of Science, Technology, Engineering, and Art Vol 1 No 2 (2023): Asian Journal of Science, Technology, Engineering, and Art
Publisher : Darul Yasin Al Sys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/ajstea.v1i2.2036

Abstract

The purified natural iron sand contains magnetic dioxide particles to produce ferric ions (Fe3+) which can be used as precursors for the synthesis of the red pigment hematite. Hematite red pigment synthesis was carried out by coprecipitation method with NaOH precipitating agent and hydrothermal.The optimum pH of the hematite red pigment synthesis reaction using the coprecipitation method is pH 6. At pH 6 it will produce a hematite red pigment with higher brightness. By the hydrothermal method Fe3O4 added 50 mL HCl (12,063 M) in a beaker. The filtrates are added boric acid with varying concentrations of 0.1 M; 0.3 m; 0.5 M and 1.0 M at a volume ratio of 1:1. Gradually the solution is supplemented with NH4OH 6 M until a solution with a pH of 8 is obtained at a constant temperature of 70oC. The formed precipitate is put in the microwave for 10 minutes with a pressure of 90P. The characterization was carried out using XRD to see the crystal structure of the product and UV-Vis to see the absorption wavelength.und is the anatase phase.
Co-Authors Wicaksono, Dimas Aji