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Identifikasi Karakter Biodisel Minyak Jelantah Menggunakan Instrumen Gas Cromatografi Mass Spectroscopy (GC-MS) Gargazi Gargazi; Hendrawani Hendrawani; Hulyadi Hulyadi
Empiricism Journal Vol. 3 No. 2: December 2022
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/ej.v3i2.1083

Abstract

Tujuan penelitian ini adalah mengidentifikasi dan karakterisasi biodiesel dari miyak jelantah. Penelitian ini merupakan penelitian deskriftif kualitatif. Variabel yang diamati dalam penelitian ini antara lain senyawa kimia dan struktur molekul penyusun biodiesel dari minyak jelantah. Penentuan senyawa-seyawa kimia serta struktur molekul penyusun biodiesel dari minyak jelantah diukur menggunakan instrument GC-MS. Hasil pengukuran selanjutnya dijadikan dasar dalam mengidentifikasi krakter biodiesel. Komponen tertinggi berupa senyawa asam lemak. Asam lemak berupa asam oktadekanoat  dengan % area 45,10, selanjutnya metil ester heksadekanoat dengan % area 35,99%.  Komponen ketiga dengan jumlah tertinggi berupa senyawa metil ester oktadekanoat dengan % area 9,42.  Komponen keempat berupa metil ester tetradekanoat dengan % area 3,43. Metil ester C16 masih rendah yaitu sebesar 35,99%. Karakter biodiesel dari minyak jelahtah masih banyak mengandung asam lemak bebas golongan oktadekanoat dan konsenterasi C16 yang menjadi dasar kemudahan biodiesel untuk terbakar masih rendah. Identification of Characteristics of Used Cooking Oil Biodiesel Using Gas Chromatography Mass Spectroscopy (GC-MS) Instruments Abstract The purpose of this study is to identify and characterize biodiesel from used cooking noodles. This research is a qualitative descriptive research. The variables observed in this study include chemical compounds and the molecular structure of biodiesel constituents from used cooking oil. The determination of chemical compounds and the molecular structure of biodiesel constituents of used cooking oil was measured using the GC-MS instrument. The results of the next measurement are used as a basis in identifying biodiesel krakters. The highest component is in the form of fatty acid compounds. Fatty acids are octadecanoic acid with a % area of 45.10, then methyl hexadecanoic ester with a % area of 35.99%. The third component with the highest amount is the octachonate methyl ester compound with a % area of 9.42. The fourth component is methyl ester tetradecanoate with % area 3.43. Methyl ester C16 is still low at 35.99%. The character of biodiesel from used cooking oil still contains a lot of free fatty acids of the octadecanoic group and C16 concentration, which is the basis for the ease of biodiesel to burn is still low.
Correlation Profile of Cognition Levels and Student Ability to Solve Problems in Biodiesel Synthesis Hulyadi Hulyadi; Faizul Bayani; Muhali Muhali; Yusran Khery; Gargazi Gargazi
Jurnal Penelitian Pendidikan IPA Vol 9 No 6 (2023): June
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i6.3130

Abstract

Covid-19 has had a huge impact in all sectors. The socio-economic sector experienced the heaviest impact. One of the sectors affected is the world of education. Education is now transforming from face-to-face learning to online learning. Online learning is very helpful for students during covid-19. In addition to having a positive value, online learning also contains a negative value. For example, students' interest in reading increases, but on the other hand, students' reading power is low. Low reading power has an impact on decreasing the cognitive level of students. The purpose of this research is to first identify the cognitive level profiles and students' abilities in solving problems in the synthesis of biodiesel from used cooking oil. Analyzing the correlation between cognitive level and students' ability to solve problems. This research is a correlational descriptive research. This research was conducted on fourth semester chemistry education students who were taking an instrument chemistry course and determining the structure of organic compounds. Cognitive level and problem-solving ability were measured using a rubric for assessing cognitive level and student problem-solving ability. The data obtained is then described in graphical form. The data was then tested for correlation using the SPSS product moment correlation test. In this study, it was found that the cognitive level of most students entered at C2 and C3 levels and the average problem solving ability was 53.84. The results of the correlation test show that the cognitive level is positively correlated with the ability of students to solve problems. This is evidenced by the comparison of the value of r count 0.724> r table 0.44. Based on the results of this study, it can be concluded that the cognitive level and problem solving abilities of students are still low. Cognitive level and problem solving ability are positively correlated