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Journal Of Research and Education Chemistry (JREC)
Published by Universitas Islam Riau
ISSN : 26858967     EISSN : 26858959     DOI : https://doi.org/10.25299/jrec.2022.vol4(1).9315
Core Subject : Science, Education, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Education
1. research and reviews literature about chemistry education such as : instruction, learning and theaching, curriculum development, learning environment, theacher education, educational and educational development in chemistry education 2. research and review literature about chemistry such as : organic, inorganic physical, analitycal, biochemistry, material chemistry, environment, ethnochemistry and its application in teaching and learning
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 102 Documents
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STUDI VARIASI RASIO BATUBARA KALORI RENDAH DAN BIOMASSA SEKAM PADI DALAM PEMBUATAN BIO-BRIKET BERDASARKAN ANALISIS PROKSIMAT, TOTAL SULFUR, DAN NILAI KALOR muzakki; A. Sry Iryani
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).27927

Abstract

This study aims to examine the effect of different mixture ratios of low-calorie coal and rice husk biomass on bio-briquette characteristics and to determine the optimum ratio as a more environmentally friendly alternative fuel. The ratio variations were 0:1, 1:0, 1:2, 2:1, 3:1, 1:3, and 2:3 (coal: rice husk). The analyzed parameters included proximate analysis, namely moisture, ash, volatile matter, and fixed carbon, as well as total sulfur and calorific value. The data were evaluated descriptively using range, mean, standard deviation, and correlation with coal fraction; one-way ANOVA can be applied when replicated data are available for each treatment. The results showed that increasing the coal fraction increased fixed carbon and calorific value, but also increased ash and total sulfur. In contrast, increasing the rice husk fraction reduced sulfur and ash, but increased moisture and volatile matter. The 3:1 ratio was selected as the most balanced ratio because it produced a calorific value of 5,800 cal/g, a sulfur content of 0.60%, and a moisture content of about 5.50%. However, because ash and volatile matter remained relatively high and fixed carbon was still low compared with certain bio-briquette standards, this optimum ratio should be further validated through actual combustion tests, including ignition time, combustion duration, flame stability, and SO₂ emission.  
PENGARUH WAKTU PENYIMPANAN SAMPEL TERHADAP HASIL ANALISA NIKEL (Ni) PADA BIJIH LATERIT MENGGUNAKAN ALAT XRF Gustan, Azhari; Iryani, A. Sry; Riza Basalamah, Faisal
Journal of Research and Education Chemistry Vol. 8 No. 1 (2026): April
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2026.vol8(1).28207

Abstract

This study aims to determine the effect of sample storage time on the results of nickel (Ni) content analysis, determine changes in physical characteristics in the form of water content during storage, and evaluate the level of analysis accuracy using the X-Ray Fluorescence (XRF) method. The study was conducted with variations in storage time of laterite nickel ore samples for 0 weeks, 1 week, 2 weeks, 3 weeks, and 4 weeks. The prepared samples were analyzed using XRF without reheating to maintain natural conditions after storage. The parameters observed included nickel (Ni) content, water content, and deviation of analysis results. The results showed that the nickel content decreased from 1.88% in week 0 to 1.75% in week 4. Meanwhile, the water content increased from 0.30% to 1.25% as storage time increased. This increase in water content was influenced by the hygroscopic nature of laterite ore which absorbs moisture from the environment. In addition, the deviation value of the analysis results increased from 0.00% to 0.13%, which indicates a decrease in the accuracy of XRF analysis due to changes in the physical condition and matrix of the sample. Based on the research results, the recommended optimum storage time is a maximum of 1 week, because under these conditions the water content is still below the ideal limit (<1%) and the deviation of the analysis results is relatively small so that the results are still representative.

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