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All Journal KOVALEN: Jurnal Riset Kimia Fullerene Journal of Chemistry Jurnal Inovasi Pendidikan dan Sains CHEDS: Journal of Chemistry, Education, and Science Arfak Chem: Chemistry Education Journal
Lailatusholihah, Isna
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics Social Sciences

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Sintesis Metil Ester sebagai Biodiesel Minyak Biji Kesambi (Schleichera oleosa L.) melalui Esterifikasi dan Transesterifikasi Lailatusholihah, Isna; Suganda, Angga; Mahardika, Micha; Prastiwi, Dina Alva; Situmeang, Boima
Arfak Chem: Chemistry Education Journal Vol. 7 No. 1 (2024): Arfak Chem
Publisher : Universitas Papua, Manokwari, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/accej.v7i1.592

Abstract

Synthesis of methyl ester as biodiesel kesambi seed oil (schleichera oleosa l.) through esterification and transesterification has been successfully conducted. Kesambi seeds are one of the seeds that can produce essential oils, which is about 70%. The methods used in this study are esterification and transesterification. Characterization of methyl ester compound used H-NMR spectrometry The procedure was sample preparation, degumming, esterification, transesterification, and biodiesel quality test. The esterification process had been two steps using a methanol ratio of 20: 1. The biodiesel quality test results are not sufficient from the SNI 04-7182: 2006 standard, where the acid number is 0.718 Mg KOH / g, moisture content 0.32-0.51%, density 840 kg / m3 and viscosity 25.1 Mm2 / s. 
TOBACCO LEAVES EXTRACT (Nicotiana tabacum) AS A NATURAL CORROSION INHIBITOR OF CARBON STEEL Mahardika, Micha; Susparini, Ninik Triayu; Lailatusholihah, Isna
Jurnal Inovasi Pendidikan dan Sains Vol 5 No 3 (2024): Desember
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Nahdlatul Wathan Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51673/jips.v5i3.2033

Abstract

Tobacco leaves have great potential as corrosion inhibitors due to the chemical compounds present in tobacco leaf extracts that play a role in inhibiting the corrosion rate, specifically tannins. The objective of this study was to determine the corrosion rate value and efficiency of tobacco leaf extract as an inhibitor on corrosion coupons exposed to a sulfuric acid solution. The initial step involves preparing smooth corrosion coupons and tobacco leaves. The tobacco leaves were prepared by extracting them through a maceration method using ethanol solvent over a 5-day period. A corrosive media solution of 1 M H2SO4 and corrosion coupons measuring 0.1 x 1.3 x 7.65 cm were also prepared. Subsequently, both the corrosion coupons and tobacco leaf extract were soaked in an acidic solution for the initial sample. The highest tannin content was found in the tobacco leaf extract using ethanol solvent (in a ratio of 1:6), yielding 31.35%. At the highest concentration of 800 ppm, the corrosion rate of the tobacco leaf extract was measured at 17.36 mm/year. Additionally, the inhibition efficiency of the tobacco leaf extract in the corrosive medium, a 1 M H2SO4 solution, reached 89.82% at a concentration of 800 ppm, with a soaking time of 5 days.
ANALISIS KANDUNGAN SO2, NO2 DAN PARTIKULAT PADA CEROBONG BOILER BERBAHAN BAKAR BATU BARA PADA PERUSAHAAN SEPATU Lailatusholihah, Isna; Hindriani, Heny; Fajri, Ahmad Dinul; Mahardika, Micha
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.10276

Abstract

Udara mempunyai banyak kandungan, yaitu oksigen udara (O2) yang digunakan manusia dalam proses pernafasan. Jadi kebersihan udara harus diperhatikan. Tujuan dari penelitian ini adalah menganalisis emisi udara yang dihasilkan cerobong boiler pada industri sepatu. Hasil analisis menunjukkan bahwa emisi udara yang dihasilkan industri sepatu menggunakan boiler berbahan bakar batubara dengan konsumsi bahan bakar 1.450 kg/hari menghasilkan emisi SO2 yang dianalisis sesuai SNI 19-7117.3.1-2005 pada bulan Juli sebesar 503 mg/m3, pada bulan Agustus sebesar 9 mg/m3 dan pada bulan September sebesar 1 mg/m3. Sedangkan analisis NO2 sesuai SNI 19-7117.5-2005 menghasilkan konsentrasi pada bulan Juli sebesar 254 mg/m3, pada bulan Agustus sebesar 103 mg/m3 dan pada bulan September sebesar 127 mg/m3.
Validation of Boron Analysis Method on SRM Tomato Leaves NIST No. 1573a using Fluorescence Spectrophotometry Lailatusholihah, Isna; Tri Utami, Aisyiah Restu; Roto, Roto; Kuncaka, Agus
Jurnal Kimia Fullerene Vol 10 No 1 (2025): Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v10i1.661

Abstract

The study of borax contamination on SRM Tomato Leaves NIST no. 1573a was succesfully analized. This study used sausage samples using Spectrophotometry Fluoresence method. Boron analysis by fluorescence spectrophotometry was done by excitation at 522 nm and emission at 593 nm. Validation method uses linear standard curve in the concentration range of 1-4.5 ppm with R2 = 0.9991. The sensitivity, limit of detection, limit of quantification, and percent recovery are 4695.7 a.u.ppm-1, 0.241±0,06 ppm, 0.805±0,06 ppm, and 92.8%, respectively. This means that determining boron using the borate ester distillation method with fluorescence spectrophotometry can be used as a new method for determining boron levels in food samples.
Determination of Boron Concentration at Sausage Samples with Distillation of Ester Borane Method using Fluorescence Spectrophotometry Lailatusholihah, Isna; Aisyiah Restutiningsih Putri Utami; Micha Mahardika
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 3 (2023): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i3.16673

Abstract

The study of borax contamination in food samples was successfully analyzed. This study used sausage samples using the Fluorescence Spectrophotometry method. Sausage samples were from Daerah Istimewa Yogyakarta (DIY). This study used 4 sausage samples. The samples were given labels A, B, C, and D. The steps of the research were optimation of distillation time, optimation of catalyst, optimation of solvent, and then followed by analyzing the borax concentration on sausage samples. Based on this study, the optimum distillation time was 24 hours. On the other hand, the best catalysts and solvents were sulphuric acid and ethanol. The A and B samples contained borax contamination and the concentration was under 5 ppm. The C and D samples contained borax contamination and the concentration was above 5 ppm. The conclusions were that A and B samples were not given borax addition and C and D samples were given borax addition.
Co-Authors Agus Kuncaka Aisyiah Restutiningsih Putri Utami Fajri, Ahmad Dinul Heny Hindriani Mahardika, Micha Micha Mahardika Ninik Triayu Susparini, Ninik Triayu Prastiwi, Dina Alva Roto Roto Situmeang, Boima Suganda, Angga Tri Utami, Aisyiah Restu