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Jurnal Sains dan Teknologi Reaksi
Published by Politeknik Negeri Lhokseumawe
ISSN : 1693248X     EISSN : 25491202     DOI : http://dx.doi.org/10.30811/jstr
Core Subject : Science, Education, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology
Jurnal Sains dan Teknologi Reaksi atau boleh disingkat dengan nama JSTR, berfokus pada banyak Aspek Teknik Kimia, seperti: Teknik Reaksi Kimia, Teknik Kimia Lingkungan, Energi Fosil dan Terbarukan, serta Sintesis dan Pengolahan Material.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 318 Documents
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OPTIMIZATION OF PIT SLOPE DESIGN AT BANKO BARAT PIT 2 IN 2016, PT BUKIT ASAM (PERSERO) TBK, TANJUNG ENIM MINING UNIT, SOUTH SUMATRA PROVINCE Hulwani, Zati; Alam, Pocut Nurul; Al-Huda, Nafisah; Rusydy, Ibnu
Jurnal Sains dan Teknologi Reaksi Vol 23, No 01 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i01.7368

Abstract

Slope stability is generally a critical concern in maintaining daily mining operations, as instability can disrupt activities and result in material losses or even fatalities. In designing an open-pit mine, it is essential to conduct slope stability analysis to ensure both safety and economic efficiency. This study focuses on optimizing slope stability analysis at PT Bukit Asam (Persero) Tbk, specifically in the Banko Barat Pit 2 area, using the Bishop Simplified method. The analysis was conducted using GeoSlope 2007/Slope W software to design and optimize a safe excavation slope by incorporating secondary data obtained from PT Bukit Asam, including mining design parameters (slope geometry) and the physical and mechanical properties of the rock, such as density, cohesion, and internal friction angle. The optimization results indicated that cross-sections A-A', C-C', and D-D' could accommodate an additional 3 benches. Cross-section B-B' was also optimized by adding 3 benches downward. The safety factor (SF) values for the first and second optimization scenarios showed stable slope conditions. However, for the third optimization (overall slope), the SF values indicated a marginal or risky condition. Cross-section E-E' could be optimized by adding 5 benches downward, and all five cross-sections remained in a stable condition. Keywords: Safety Fctor, Slope Stability, Bishop Simplified Method, Optimization, GeoSlope 2007/Slope W software
Tailoring the Mechanical and Antimicrobial Properties of PLA Bioplastics Through Chitosan and Citronella Oil Additives Safitri, Aida; Raihan, Raudhatul
Jurnal Sains dan Teknologi Reaksi Vol 23, No 01 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i01.7400

Abstract

This study investigates the effect of varying chitosan concentrations on the mechanical properties of polylactic acid (PLA)-based films modified with citronella essential oil as an antimicrobial agent. Characterization results indicate that the incorporation of chitosan at 3–5 wt% relative to PLA enhances the tensile strength of the material. This improvement is attributed to the formation of intermolecular hydrogen bonds between the hydroxyl groups of chitosan and the ester groups of PLA, which strengthen the film structure. However, the addition of citronella essential oil to the system significantly reduces the tensile strength. This reduction is associated with the poor compatibility between the essential oil and the PLA–chitosan matrix. Scanning electron microscopy (SEM) analysis revealed the presence of oil droplet agglomerations within the matrix, acting as stress concentration points that weaken the film's mechanical integrity. Such phenomena have been widely reported in PLA-essential oil composite systems. Regarding antimicrobial activity, all films containing both chitosan and citronella oil exhibited significant inhibitory effects against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative). This antimicrobial efficacy is attributed to a synergistic mechanism, involving the electrostatic disruption of bacterial cell membranes by chitosan and the cytotoxic effects of citronella constituents such as citronellal and geraniol, which penetrate and damage microbial cell walls. Key words: PLA, chitosan, citronella essential oil, Escherichia coli, Staphylococcus aureus.
FORMULATION OF SHAMPOO BAR USING ACTIVE INGREDIENTS OF CANDLENUT OIL (ALEURITES MOLUCCANUS L) AND STEARIC ACID Fayza, Nina; Suryani, S; Elfiana, E; Fitria, F
Jurnal Sains dan Teknologi Reaksi Vol 23, No 01 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i01.7635

Abstract

This study aimed to evaluate the effect of candlenut oil (Aleurites moluccanus L) and stearic acid ratios, along with mixing temperatures, on the quality of shampoo bars. A total of 25 formulations were prepared using five ratios of candlenut oil to stearic acid (6:30%, 11:25%, 16:20%, 21:15%, and 26:10%) and five mixing temperatures (70℃, 75℃, 80℃, 85℃, and 90℃). Constant ingredients included sodium cocoyl isethionate 41%, methyl ester sulfonate 13%, cetyl alcohol 5%, cocoa butter 1.9%, essential oil 1%, citric acid 0.1%, lexgard natural 1%, and colorant 1%. Quality evaluation referred to SNI 06-2692-1992 standards, covering pH, moisture content, foam stability, antibacterial activity, and organoleptic properties (color, aroma, texture). Results indicated that both the oil–acid ratio and mixing temperature significantly affected shampoo bar characteristics. The optimal formulation was obtained at a candlenut oil to stearic acid ratio of 6:30% with a mixing temperature of 70℃. This formula produced a pH of 6.47, stable foam with only 2.77% loss, low moisture content of 1.87%, and antibacterial activity of 100%. Organoleptic evaluation also showed high panelist acceptance for its color, aroma, and texture, indicating good consumer preference and product stability. Keywords: Shampoo Bar, Candlenut Oil, Stearic Acid, Mixing Temperature, Antibacterial
EVALUATION STUDY OF BLAST-INDUCED ROCK FRAGMENTATION USING STEMROCK AND BLASTBAG AIR DECK SYSTEMS WITH THE KUZ-RAM METHOD AT THE LIMESTONE QUARRY NAROGONG SITE OF PT SOLUSI BANGUN INDONESIA TBK Cahyaningsih, Bimbi; Putra, Arahman Panji; Harsono, Dimas Ghani Putra; Avesina, Victor Habib
Jurnal Sains dan Teknologi Reaksi Vol 23, No 01 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i01.7663

Abstract

PT Solusi Bangun Indonesia Tbk (SBI) has implemented air-deck technology in limestone blasting to optimize explosive consumption while maintaining the required fragmentation quality. This study aims to evaluate and compare the performance of two types of air-deck systems, namely stemrock and blastbag, in producing suitable rock fragmentation at the Sijebi Quarry, Narogong. The research was conducted through three blasting trials with geometry design based on ICI Explosives guidelines and fragmentation prediction using the Kuz-Ram model. The blasting parameters evaluated included burden, spacing, stemming, subdrilling, and charge column length. The results indicate that stemrock air-deck with a 7.5 m primer charge produced 87.12% of fragments smaller than 50 cm, whereas blastbag air-deck under the same conditions achieved 95.31%. However, other trials using blastbag produced coarser fragmentation with fragments exceeding 100 cm. Overall, the most reliable fragmentation distribution, closely aligned with Kuz-Ram predictions, was obtained with a blasting geometry of 4 m burden, 5 m spacing, 3 m stemming, 1 m subdrilling, and a 7.5 m primer charge using ANFO in limestone. This study recommends the aforementioned blasting geometry as the optimal configuration for achieving efficient and effective fragmentation in limestone quarry operations. Keywords: Air Deck, Stemrock, Blastbag, Fragmentation, Kuz-Ram.
EVALUATION OF THE IMPLEMENTATION OF OCCUPATIONAL HEALTH, SAFETY, AND ENVIRONMENTAL (OHSE) MANAGEMENT SYSTEM IN HIGHER EDUCATION LABORATORIES: A CASE STUDY OF THE ANALYTICAL CHEMISTRY LABORATORY, STATE POLYTECHNIC OF LHOKSEUMAWE Fitriah, Nurul
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.7946

Abstract

Occupational Health and Safety (OHS) is a crucial aspect in ensuring safe laboratory operations, both in academic and research settings. Laboratory risks include exposure to hazardous chemicals, physical hazards, and behavioral negligence that may lead to workplace accidents. This study aims to evaluate the implementation of OHS in the Analytical Chemistry Laboratory of the State Polytechnic of Lhokseumawe, with a focus on safety policies, compliance with the use of personal protective equipment (PPE), risk perception, and safety culture. The research employed a descriptive quantitative approach through observations, checklist assessments, and brief interviews with laboratory users. The evaluation results indicate that OHS implementation has been carried out but remains suboptimal; aspects such as safety facilities, planning, and management involvement still require improvement. These findings are consistent with the literature emphasizing the importance of risk management, safety culture, and continuous supervision in laboratories. Recommendations include strengthening training, enhancing technician supervision, and providing adequate OHS facilities to minimize the potential for workplace accidents. Keywords: OHSE, laboratory, risk management, safety culture, OHS implementation
APPLICATION OF FOURIER TRANSFORM INFRARED SPECTROSCOPY (FTIR) IN SAMPLE PREPARATION: MATERIAL CHARACTERIZATION AND MECHANISM INVESTIGATION Fitriah, Nurul
Jurnal Sains dan Teknologi Reaksi Vol 23, No 01 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i01.7947

Abstract

Fourier Transform Infrared Spectroscopy (FTIR) is an instrumental analysis technique that is widely used in the fields of materials science, engineering, and microbiology. The principle of FTIR is based on molecular vibrations that produce a characteristic spectrum as a “molecular fingerprint.” In sample preparation, FTIR plays an important role in material characterization (solid sorbents, metal organic frameworks, hybrid materials) and investigation of the extraction mechanisms of organic, inorganic, and biomacromolecular molecules. This study used a quantitative descriptive approach with observation, interviews, and documentation at the Analytical Chemistry Laboratory of the Lhokseumawe State Polytechnic. The results show that FTIR is most effective in the field of materials science (85%), followed by microbiology and the environment (80%), and least effective in asphalt and materials engineering (75%). With its speed, non-destructive nature, and flexibility, FTIR has great potential, although the interpretation of complex spectra remains a major challenge. Keywords: FTIR, material characterization, sample preparation, extraction mechanism, bioremediation
ANALYSIS OF COAL QUALITY IMPROVEMENT USING CHEMICAL METHODS FOR MEETS STANDARDS OF CALORIFIC VALUE Nahar, N; Ridwan, R; Irwan, I; Pardi, P
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6331

Abstract

ABSTRACT As a country with relatively large coal resources and reserves, Indonesia will face challenges that are not easy in the future. The large amount of coal resources and reserves as well as the continuity of the coal mining industry cannot be ignored. Coal consumption in the world is expected to continue from time to time, especially in the Asian region. Lignite coal reserves account for around 48% of total coal reserves in the world, meanwhile in Asia lignite coal reserves reach 30%, while in Indonesia they reach 60% of total coal reserves. Although the amount of lignite coal consumed accounts for around 30% of total world coal production. The amount consumed in Asia accounts for only 10% of its total coal production. Especially in Indonesia, mining practices tend to tend to be higher quality bituminous and sub-bituminous coal which is more widely mined and produced because producing lignite coal is less economical and cannot meet market criteria. Thus, it can be predicted that what will remain in the future will be a large amount of lignite coal reserves that cannot be utilized. Because the opportunity to fill the potential of the coal market is still wide open, whether used directly as an energy source in power plants or exported abroad, promotion of the use of lignite coal must be made as early as possible as a very important issue for Indonesia. To improve the quality of lignite coal to coal whose quality is like that of anthracite coal so that it can be used, therefore it is necessary to have technology to improve the quality of lignite coal, so the Industrial Innovation Research research will improve the quality of coal using the stirring method by varying the influence of temperature and mixing time. coal, residual oil and kerosene can reduce the water content contained in low rank coal by the adsorption process. The research results show that operating conditions greatly influence the distribution of coal products. Relatively good operating conditions were obtained at a temperature of 200o C and a reaction time of 70 minutes with the results of: oil: 25 ml, water content: 0.668%, ash content: 11.883%, volatile matter: 30.122%, fixed carbon: 57.377%, and calorific value : 6581 Kcal/kg.Key words: Coal; Quality; Kerosene; Calorific Value; Enhancement
PENURUNAN KANDUNGAN AMMONIA PADA LIMBAH CAIR DENGAN METODA AERASI BUBBLING DAN PEMANASAN Sariadi, S
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.6422

Abstract

ABSTRAK Limbah cair yang dihasilkan oleh pabrik pembuatan pupuk urea mengandung ammonia. Apabila kandungan ammonia dalam limbah dalam jumlah yang cukup besar langsung dibuang maka akan mengganggu kelangsungan hidup makhluk yang berada dalam badan penerima akhir buangan limbah tersebut. Untuk itu kandungan ammonia tersebut harus diturunkan sampai memenuhi syarat buangan yang diizinkan. Penurunan kandungan ammonia dapat dilakukan dengan metode aerasi bubbling dan pemanasan. Prinsipnya adalah pengontakan limbah cair dengan udara sehingga ammonia larut di dalamnya, selanjutnya penguapan ammonia dilakukan dengan pemanasan. Variabel yang digunakan adalah temperatur 50, 60, dan 70 0C, waktu kontak 30, 60, dan 90 menit, dan laju alir udara 4, 5, dan 6 ltr/menit. Semakin lama waktu kontak dan semakin tinggi temperatur serta laju alir udara, maka semakin tinggi prosentase penurunan kandungan ammonia. Prosentase penurunan kandungan ammonia yang paling tinggi dicapai pada laju alir udara 6 ltr/mnt pada temperatur 70 0C dan waktu kontak 90 menit yaitu sebesar 88,82%.Kata kunci: Limbah cair, ammonia, aerasi bubbling, pemanasan
PERANAN SERBUK BENTONIT TERHADAP SIFAT MEKANIS DARI KOMPOSIT RESIN POLIESTER BQTN 157-EX Rihayat, Teuku
Jurnal Sains dan Teknologi Reaksi Vol 22, No 02 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i02.6350

Abstract

ABSTRAK Komposit merupakan campuran bahan-bahan yang berbeda atau telah menghasilkan sifat dan karakterisasi yang lebih banyak, tidak dihasilkan pada bahan utama. Resin poliester BQTN 157-EX merupakan bagian dominan (mayor) pada komposit yang berfungsi sebagai matriks dan bentonit merupakan bagian tidak dominan (minor) pada komposit yang berfungsi sebagai filler. Telah dilakukan penelitian pertama terhadap olahan bentonit yang bersumber dari bahan anorganik dan sifat hidrofilik. Pemeriksaan ini dilakukan dengan menggunakan alat kekuatan tarik. Hasil penelitian menunjukkan, pada nanokomposit 3,5%, massa bentonit dan ukuran partikel 300 mesh menghasilkan kuat tarik sebesar 197,57 Mpa, elongasi sebesar 24% dan Impact 0,80 Joule. Hal ini lebih baik jika dibandingkan dengan resin virgin polyester yang menghasilkan kekuatan tarik 104,92 Mpa, elongasi 13,32% dan Impact 0,21 Joule.Kata Kunci : Poliester BQTN 157-EX, Komposit, Sifat Mekanik
ANALISA KADAR ASAM OKSALAT DALAM ASAM SUNTI Suryani, S
Jurnal Sains dan Teknologi Reaksi Vol 22, No 01 (2024): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v22i01.6339

Abstract

ABSTRAK Asam Sunti (Belimbing wuluh kering) banyak dikonsumsi oleh masyarakat Aceh. Asam Sunti mengandung ion oksalat yang dapat menimbulkan batu ginjal dalam tubuh manusia. Penelitian ini dilakukan untuk melihat kadar asam oksalat dari asam sunti. Penelitian dilakukan terhadap Asam Sunti yang mengalami perlakuan perebusan dan yang tidak mengalami perlakuan perebusan. Konsentrasi garam divariasikan 100 gram, 150 gram dan 200 gram. Waktu pengeringan divariasikan 5 hari, 10 hari dan 15 hari. Hasil yang diperoleh konsentrasi asam oksalat tertinggi sebesar 0,1605 N terdapat pada perlakuan tanpa perebusan, jumlah garam 200 gram dan waktu pengeringan 15 hari. Keywords: Asam Sunti, asam oksalat

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