Article Per Year (5 Year)
p-Index From 2021 - 2026
0.92
P-Index
This Author published in this journals
All Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Jurnal Ilmiah Universitas Batanghari Jambi SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Mantis Journal of Fisheries Frontier Advances in Applied Science and Engineering
Robekca Purba
Unknown Affiliation
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

Published : 5 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 5 Documents
Search

 1 
Analysis of Viscosity Effects from the Addition of Mesona Palustris (Black Grass Jelly) on Chitosan Polymer Mohamad Obby Adianto; Muhammad Agni Gustama; Ferdian Budi Ar Rouf; Nyimas Ulfatry Utami; Robekca Purba
Frontier Advances in Applied Science and Engineering Vol. 3 No. 1 (2025)
Publisher : Tinta Emas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59535/faase.v3i1.555

Abstract

The main purpose of polymer injection is to reduce the water-oil mobility ratio. Polymers that are widely used are polyacrylamide and polysaccaharides. By increasing the viscosity of the injection fluid, polymer injection can increase the sweep efficiency thereby increasing oil recovery. Refining on petroleum is highly dependent on the efficiency of macroscopic and microscopic pressing. This research purpose is to determine whether the viscosity effect resulted from mesona palustris addition on chitosan polymers could make a good viscosity for oil recovery. The method used in this research is a laboratory experiment with an Ostwald viscometer. The salinity of the formation water used in this study was 20.000 ppm with variations in polymer concentrations of 500 ppm, 1.000 ppm, and 2.000 ppm on the polymer without a mixture of mesona palustris and with a mixture of mesona palustris. The results showed that there was a decrease in polymer viscosity with the addition of mesona palustris to the chitosan polymer, namely the polymer concentration of 500 ppm decreased from 1,56 cp to 1,04 cp, the polymer concentration of 1.000 ppm decreased from 1.87 cp to 1.21 cp. And at a polymer concentration of 2.000 ppm it decreased from 2.38 cp to 1.43 cp.
Indeks Pencemaran Tembaga (Cu) pada Wastewater Pertambangan Timah di Kepulauan Bangka Purba, Robekca; Ibrahim, Eddy; Saputra, Anton
Mantis Journal of Fisheries Vol. 2 No. 01 (2025): April 2025
Publisher : Department of Fisheries, Animal Science Faculty, Universitas Jambi.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/mjf.v2i01.42133

Abstract

Proses penambangan timah menggunakan air sebagai media pemisah timah dari mineral lain. Air limbah hasil produksi disalurkan ke kolam penampungan, namun berpotensi mencemari lingkungan, terutama saat curah hujan tinggi atau setelah penambangan selesai. Kandungan tembaga (Cu) yang tinggi dalam air limbah dapat merusak insang, hati, ginjal, dan sistem saraf ikan, sehingga perlu dikaji tingkat risikonya. Penelitian ini bertujuan menghitung indeks risiko ekologi potensial tembaga (Cu) menggunakan data sekunder dari PT. Timah yang diolah dengan metode Hakanson. Pengujian sampel air dilakukan di Laboratorium Terpadu Institut Pertanian Bogor menggunakan metode APHA 23rd (2017): 3111 B. Hasil perhitungan berfungsi sebagai alat diagnosis pengendalian pencemaran, menentukan area prioritas penanganan, serta memahami ancaman aktivitas tambang timah terhadap ekosistem. Perhitungan ini diterapkan untuk sistem perairan limnik atau perairan tergenang. Indeks polusi dibandingkan dengan baku mutu air kelas II sesuai PP No. 22 Tahun 2021, yang digunakan untuk budidaya ikan air tawar. Berdasarkan hasil, indeks polusi air limbah tambang timah di Kepulauan Bangka termasuk kategori risiko rendah (RI<150), sehingga limbahnya masih tergolong aman bila terjadi luapan ke daratan.
Analisis Kualitas Udara Ambien Menggunakan Indeks Standar Pencemar Udara (ISPU) dan Korelasinya Terhadap Kesehatan Manusia di Area Pertambangan Timah Kabupaten Bangka Purba, Robekca; Susanti, Susi
Jurnal Ilmiah Universitas Batanghari Jambi Vol 26, No 1 (2026): Februari
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/jiubj.v26i1.6429

Abstract

This study aims to determine ambient air quality using the Air Pollution Standard Index (ISPU) and its correlation with human health. Sampling was conducted at 11 locations in PT Timah Tbk mining areas from May 10-12, 2023, measuring PM₁₀, PM₂.₅, SO₂, CO, O₃, and NO₂ according to SNI standards by IPB LJPKS. ISPU calculation used Peraturan Menteri Lingkungan Hidup dan Kehutanan nomor 14 tahun 2020 with linear interpolation. Results showed PM₁₀ (35.4±7.0 μg/m³), PM₂.₅ (16.4±3.2 μg/m³), SO₂ (21.2±5.8 μg/m³), NO₂ (33.8±10.3 μg/m³), CO (
Edukasi pertambangan berkelanjutan sebagai upaya membangun kesadaran ekologis generasi muda Purba, Robekca
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 10, No 1 (2026): February
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v10i1.37806

Abstract

AbstrakBencana pertambangan yang berulang di Indonesia menimbulkan perdebatan publik tentang eksistensi industri pertambangan. Longsor tambang Gunung Kuda Cirebon pada 30 Mei 2025 dan banjir berulang di Morowali akibat pertambangan nikel pada Maret 2025 menjadi bukti lemahnya tata kelola pertambangan. Masyarakat cenderung menuntut penutupan tambang tanpa memahami ketergantungan kehidupan masyarakat modern terhadap produk mineral. Pengabdian masyarakat ini bertujuan memberikan pemahaman komprehensif tentang pertambangan berkelanjutan kepada siswa SMA SoliDeo Tangerang Selatan melalui materi “Mengenal Dunia Pertambangan: Dari Eksplorasi hingga Reklamasi”. Metode ceramah interaktif dan diskusi kasus digunakan untuk menjelaskan peran vital pertambangan dalam kehidupan sehari-hari serta pentingnya praktik pertambangan yang bertanggung jawab. Hasil menunjukkan peningkatan pemahaman siswa bahwa solusi bencana pertambangan bukan penutupan total, melainkan perbaikan tata kelola dan penegakan regulasi. Edukasi dini kepada generasi muda menjadi investasi jangka panjang untuk menciptakan masyarakat dan pemimpin masa depan yang memiliki kesadaran ekologi dan tanggung jawab sosial. Kata kunci: pengabdian masyarakat; pertambangan berkelanjutan; edukasi; kesadaran ekologis; generasi muda AbstractRecurring mining disasters in Indonesia have sparked public debate regarding the existence of the mining industry. The Gunung Kuda Cirebon mine landslide on May 30, 2025, and the repeated flooding in Morowali due to nickel mining in March 2025 serve as evidence of weak mining governance. Communities tend to demand mine closures without understanding modern society's dependence on mineral products. This community service program aims to provide comprehensive understanding of sustainable mining to students at SoliDeo High School, South Tangerang, through educational material titled "Understanding the Mining World: From Exploration to Reclamation." Interactive lectures and case discussion methods were employed to explain mining's vital role in daily life and the importance of responsible mining practices. Results demonstrate improved student understanding that the solution to mining disasters is not total closure, but rather improved governance and regulatory enforcement. Early education of the younger generation serves as a long-term investment in creating a future society and leaders with ecological awareness and social responsibility. Keywords: community service; sustainable mining; education; ecological awareness; youth generation
Stoichiometric Combustion Modeling and Regulatory Compliance Assessment of Indonesian Sub-bituminous Coal: Implications for Clean Coal Technology Deployment Purba, Robekca; Utami, Nyimas Ulfatry
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 11, No 1 (2026): February 2026
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v11.i1.59

Abstract

Coal is an important energy source, but its utilization must consider quality and environmental aspects for sustainability. This study aims to characterize coal from Muara Enim Regency and to evaluate its energy utilization potential. A 2.365 kg coal sample was analyzed at Geoservice laboratory, Bandung. Proximate analysis results showed total moisture 6.26%, ash content 10.63%, volatile matter 37.84%, and fixed carbon 47.71%. Ultimate analysis revealed carbon 68.56%, hydrogen 5.12%, nitrogen 1.42%, oxygen 13.71%, and sulfur 0.56%. The calorific value is 6,900 kcal/kg with fuel ratio 1.26. These parameters classify the coal as Sub-bituminous B with good combustion characteristics. Stoichiometric calculations determined theoretical air requirements of 2.24 kg/kg coal, producing 2.51 kg CO₂, 0.46 kg H₂O, 0.0009333 kg NO2 and 0.0112 kg SO₂. Theoretical SO₂ emissions (1.557 mg/Nm³) exceed Indonesian regulations, requiring Flue Gas Desulfurization (FGD) installation. The coal has good energy potential with low sulfur content, suitable for power generation with proper emission control technology. This study provides a database for optimizing energy systems and clean coal technologies..Keywords: coal characterization; calorific value; combustion stoichiometry; clean coal technology, coal chemistry
Co-Authors Anton Saputra, Anton Ar-rouf, Ferdian Budi Eddy Ibrahim Gustama, Muhammad Agni Mohamad Obby Adianto Nyimas Ulfatry Utami Susi Susanti Utami, Nyimas Ulfatry