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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 84 Documents
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OPTIMIZATION OF Zn2+ METAL ION DETECTION USING PENCIL LEAD ELECTRODE MODIFIED WITH SILVER THIN LAYER BY CYCLIC VOLTAMMETRY METHOD Zolla Azhara
Journal of Research and Education Chemistry Vol. 6 No. 2 (2024): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2024.vol6(2).18534

Abstract

Zn2+ metal ions are heavy metals that are essential for the growth and development of organisms but if the amount of zinc (Zn) in excess can be toxic and disrupt the balance of the ecosystem. This research aims to study the electrochemical response of Ag/PLE to detect Zn2+ metal ions and determine the optimum conditions of supporting electrolyte and supporting electrolyte pH for the measurement of Zn2+ metal ions. In this study, electrochemical method was used to detect Zn2+ metal ion. The electrode was modified with a thin layer of silver by electrodeposition with the cyclic voltammetry method. The results showed that Ag/PLE gave a better response than PLE in detecting Zn2+ metal ions with acetate buffer solution with pH 4 as supporting electrolyte and optimum pH.
Effect of supporting electrolyte for Cu2+ detection using Pencil Lead Electrode modified with Silver Thin Layer Zulfa, Khairunnisa
Journal of Research and Education Chemistry Vol. 6 No. 2 (2024): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2024.vol6(2).18535

Abstract

Cu2+ metal ions are a type of essential heavy metal, which in small amounts are needed by living things, but in large amounts are toxic and thus harmful to organisms and the environment. In this study, an electroanalytical approach was carried out in detecting Cu2+ using a modified Pencil Lead Electrode with a thin layer of silver by cyclic voltammetric method. A thin layer of silver was deposited on the surface of the Pencil Lead Electrode by electrodeposition with a potential scan of -0.5 V to +0.8 V. Effect of supporting electrolytes was studied. The results showed that Ag/PLE gave a better response than PLE with optimum supporting electrolyte of 0.1 M HClO4.
Pencil Lead Electrode Termodifikasi Lapisan Tipis Perak Untuk Deteksi Ion Logam Cd2+ Dengan Metode Voltammetri Fadiah; Trisna Kumala Sari
Journal of Research and Education Chemistry Vol. 6 No. 2 (2024): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2024.vol6(2).18661

Abstract

Cd2+ metal ions are contaminants that threaten the environment and human health. The purpose of the study is to study the electrochemical responses of PLE and Ag/PLE to detect Cd2+ metal ions, as well as to determine the best supporting electrolyte condition for measuring Cd2+ ions. The cyclic voltometric method is used to modify the electrodes by depositing a thin layer of silver. The results of the study show that Ag/PLE is better for detecting Cd2+ ions compared to PLE. The optimum conditions were obtained with a supporting electrolyte of acetate buffer pH 4.
Analisis Aktivitas Antioksidan dan Profil GC-MS Ekstrak Kulit Semangka (Citrullus lanatus) rahmi; Sri Benti Etika
Journal of Research and Education Chemistry Vol. 6 No. 2 (2024): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2024.vol6(2).18679

Abstract

Perubahan gaya hidup masyarakat saat ini telah meningkatkan prevalensi penyakit degeneratif yang seringkali erat kaitannya dengan radikal bebas. Antioksidan mencegah pembentukan radikal bebas. Kulit semangka mengandung senyawa-senyawa seperti alkaloid, fenol, tanin, dan flavonoid yang berpotensi sebagai antioksidan. Penelitian ini bertujuan untuk mengetahui nilai IC50 dan mengidentifikasi senyawa aktif dalam ekstrak metanol kulit semangka menggunakan GC-MS. Aktivitas antioksidan diuji menggunakan metode DPPH dengan spektrofotometer UV-Vis. Data dianalisis menggunakan persamaan regresi linier y = bx + a, dilanjutkan dengan identifikasi senyawa bioaktif melalui GC-MS. Hasil penelitian menunjukkan bahwa ekstrak metanol kulit semangka memiliki aktivitas antioksidan yang kuat dengan nilai IC50 sebesar 53,20 ppm, dibandingkan dengan kontrol positif asam askorbat yang menunjukkan aktivitas antioksidan sangat kuat dengan nilai IC50 sebesar 18,62 ppm. Analisis GC-MS mengidentifikasi 41 senyawa, di antaranya asam 9,12,15-Octadecatrienoic, methyl ester, dan asam hexadecanoic, methyl ester, adalah yang paling dominan. Kedua senyawa tersebut merupakan antioksidan yang kuat, menjadikan ekstrak tersebut sebagai sumber potensial antioksidan alami dengan berbagai manfaat kesehatan.
- DESAIN DAN UJI COBA VIDEO PRAKTIKUM SEL VOLTA BERBASIS STREAM (SCIENCE, TECHNOLOGY, RELIGION, ENGINEERING, ART, AND MATHEMATICS): - Ramanda Putri, Dewi; Fitri Refelita; Yuni Fatisa; Zona Octarya
Journal of Research and Education Chemistry Vol. 6 No. 2 (2024): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2024.vol6(2).19003

Abstract

Abstrak Penelitian ini dilatarbelakangi oleh fakta bahwa kimia seringkali dianggap sebagai ilmu yang kompleks dan abstrak, sehingga dibutuhkan pembuktian dan visualisasi yang jelas. Tujuan dari penelitian ini adalah untuk mengetahui bentuk desain video praktikum sel volta berbasis STREAM, serta untuk mengetahui tingkat validitas dan praktikalitas dari media ini. Metode penelitian yang digunakan adalah Research and Development (R&D) dan model Design, Development, Research (DDR). Tahapannya antara lain analisis (analysis), desain (design), pengembangan (development), dan evaluasi (evaluation). Penelitian ini dilakukan di SMA Al-Huda Pekanbaru. Lembar wawancara, angket uji validitas materi dan media, angket praktikalitas guru, dan angket uji respon siswa merupakan intrumen pengumpulan data pada penelitian ini. Hasilnya adalah 93,3% untuk tingkat validitas materi, 100% untuk tingkat validitas media, 93,3% untuk tingkat praktikalitas guru dengan kriteria sangat praktis, dan 97,83% untuk hasil uji respon siswa dengan kriteria sangat menarik. Maka dapat disimpulkan bahwa video praktikum sel volta berbasis STREAM (Science, Technology, Religion, Engineering, Art, and Mathematics) sangat layak digunakan dalam kegiatan pembelajaran. Kata kunci : DDR, Video Praktikum, STREAM, Sel Volta Abstract This research was instigated with the fact that chemistry is often considered as a complex and abstract science, so clear proof and visualization is needed. This research aimed at finding out STREAM (Science, Technology, Religion, Engineering, Art, and Mathematics) based voltaic cells practical work video design form, and finding out validity and practicality levels of this medium. It was Research and Development with Design, Development, Research (DDR) model. The steps were analysis, design, development, and evaluation. This research was conducted at Senior High School of Al-Huda Pekanbaru. Interview sheet, material and media validation test questionnaire, teacher practicality questionnaire, and student response test questionnaire were the instruments of collecting data. The results were 93.3% for material validity level, 100% for media validity level, 93.3% for teacher practicality level with very practical criteria, and 89.83% for student response test result with very interesting criteria. So, it could be concluded that STREAM based voltaic cells practical work video was very appropriate to be used in learning activities. Keywords : DDR, Practical Work Video, STREAM, Volta Cells
Pengaruh Bufer Asetat Terhadap Kemampuan Adsorpsi Ion Timbal(II) Menggunakan Ion Imprinted Polymer (IIP) Termodifikasi Ligan EDTA Santos, Cesno Pereira Lorenzo Dos Santos; Maria Monica Sianita
Journal of Research and Education Chemistry Vol. 6 No. 2 (2024): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2024.vol6(2).19010

Abstract

Timbal adalah salah unsur logam yang mempunyai tingkat toksisitas cukup tinggi dan jika terpapar dapat menganggu kesehatan manusia. Berbagai metode untuk removal ion timbal(II) mempunyai kelemahan kemampuan adsorpsi yang rendah, karena bekerja pada pH tertentu. Ion Imprinted Polymer (IIP) adalah adsorben yang sangat efektif dalam removal ion timbal(II). IIP pada penelitian ini telah berhasil disintesis menggunakan metode presipitasi dengan menggunakan material seperti etilendiamintetraasetat (EDTA) (ligan), asam metakrilat (MAA) (monomer), etilen glikol dimetakrilat (EGDMA) (crosslinker), etanol-asetonitril (2:1) (porogen). Tujuan dari penelitian ini untuk menentukan pH optimum bufer fosfat terhadap kemampuan adsorpsi ion timbal(II) pada IIP termodifikasi ligan EDTA. Metode ekstraksi ion timbal(II) dari kerangka polimer menggunakan 1 mol/L asam nitrat. Hasil pengulangan ekstraksi dan cucian dengan akuademin menunjukkan konsentrasi ion timbal(II) terendah pada pencucian ke-4. Hasil penelitian diperoleh nilai pH optimum bufer asetat untuk adsorpsi ion timbal(II) pada pH 5,6 dengan persentase adsorpsi sebesar 30,45%.
ANALISIS TIAMFENIKOL DALAM SIRUP KERING DAN DEGRADASINYA PADA SUHU YANG BERBEDA MENGGUNAKAN METODE KCKT Vandian Nur,, Achmad; Giani Khairunnisa, Cantika; Santika Rahmasari, Khusna; Bagus Pambudi, Dwi
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).19098

Abstract

Thiamphenicol is a broad-spectrum antibiotic that works similarly to chloramphenicol.Thiamphenicol is formulated as a dry syrup because it is unstable in water, where the amide group can undergo hydrolysis. This study aimed to determine the impact of temperature and storage time on the drug content in thiamphenicol dry syrup. The study involved physical stability testing by observing organoleptic changes and pH testing. Chemical stability was assessed by measuring drug content using HPLC (High Performance Liquid Chromatography) with a mobile phase of aquabides and methanol (4:1). The sample preparation involved storing thiamphenicol dry syrup for 7 days at room temperature (15 - 30ºC) and cold temperature (2 - 8ºC). The results indicated that temperature and storage time did not affect the physical stability during the storage period. However, a significant decrease in drug content was observed: at room temperature, a reduction of 37,20% in sample 1 and 54,57% in sample 2; at cool temperature and at cold temperature, a reduction of 29,73% in sample 1 and 24,73% in sample 2. Statistical analysis using One Way ANOVA showed significant values of 0.000 < 0.05 for sample 1 and 0.001 < 0.05 for sample 2, indicating that temperature differences significantly affect the thiamphenicol content. The results demonstrate that temperature and storage time have a significant impact on the chemical stability of thiamphenicol dry syrup.
ANALISIS PEMAHAMAN MAHASISWA UNIVERSITAS NEGERI MEDAN TERHADAP KONSEP SIFAT KOLIGATIF LARUTAN DALAM PEMBELAJARAN KIMIA Serli Nawati Azhari; Syafitri, Amelia
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).22503

Abstract

This study aims to analyze students' understanding of the concept of colligative properties of solutions in chemistry learning. The research method used is a quantitative method with data collection techniques through a dare questionnaire distributed using Google Form. The research subjects consisted of students of Medan State University who had studied the topic of colligative properties of solutions. The questionnaire used contained a series of closed and open questions to measure the level of students' understanding, including conceptual aspects, applications in daily life, and difficulties faced in understanding the material. The data obtained were analyzed statistically using descriptive tests to determine the distribution of students' understanding, as well as correlation tests to see the relationship between certain factors, such as academic background and learning resources used. The results showed that the level of students' understanding varied, with most students having a moderate understanding of the concept of colligative properties of solutions. Factors that contributed to this level of understanding included the teaching method used, the availability of learning resources, and students' learning motivation. The main challenge faced by students was in understanding the concepts of osmotic pressure and freezing point depression. These findings have an impact on improving chemistry learning strategies, especially in the use of more interactive and contextual methods to help students understand the concept of colligative properties of solutions more deeply.
Pengaruh Metode Ekstraksi Terhadap Kandungan Flavonoid dan Efektivitas Antibakteri Hand Sanitizer Dari Kulit Jeruk (Citrus Sinensis L.) Aisyah, Widya; Sinardi, Sinardi
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).23065

Abstract

Sweet orange peel (Citrus sinensis L.) is an agricultural by-product with promising potential as a natural raw material for hand sanitizer due to its bioactive compounds, particularly flavonoids, known for their antibacterial properties. This study investigates the influence of two extraction methods—infusion and maceration—using peel weights ranging from 10–50 g, on the characteristics and quality of hand sanitizer formulations. The products were evaluated through pH, density, drying time, organoleptic properties, skin irritation, flavonoid identification, and antibacterial activity against Escherichia coli using the disc diffusion method. Results showed that maceration yielded a more intense brick-red color at 40 g and 50 g, while infusion produced only a concentrated yellow extract. All formulations exhibited pH values within the safe skin range (4.5–6.5), density of 0.86–0.90 g/mL, and drying times of 14–22 seconds. No irritation was observed in skin tests, and panelist acceptance was higher in formulations containing 30–50 g peel. However, none of the hand sanitizer formulations inhibited E. coli growth (0 mm), in contrast to the positive control (Ciprofloxacin 100 ppm), which produced a 31.55 mm inhibition zone. The lack of activity is likely due to the Gram-negative nature of E. coli, low flavonoid concentrations, limited gel diffusion, and compound degradation.
IDENTIFIKASI DAN PEMETAAN KUALITAS AIRTANAH DANGKAL DI SEKITAR DAERAH INDUSTRI TAHU, KECAMATAN MANDAU, DURI fauzia, sifa; Mairizki, Fitri
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).23216

Abstract

Mandau District is located in the city of Duri, Riau Province, and is an area experiencing rapid economic growth based on household-scale industries. One of the growing micro-enterprises is the tofu industry, which generates liquid waste. The liquid waste from the tofu industry is characterized by a high content of organic matter, COD, and total nitrogen (Ntotal), which, if not properly treated, can seep into the ground and contaminate the groundwater layer. The aim of this study is to analyze the physical and chemical quality of groundwater and assess its feasibility as a source of drinking water. The method used in this research involves field sampling of groundwater using purposive sampling, followed by laboratory analysis. The parameters tested include color, taste, odor, TDS, EC, pH, COD, and Ntotal. The results of the physical and chemical analysis of groundwater at 20 stations in the study area show that all stations (100%) have clear water; all stations (100%) have tasteless groundwater; 19 stations (95%) have odorless groundwater and 1 station (5%) has odorous groundwater; all stations (100%) have TDS values < 500 mg/l; EC values range from 31 to 280 µS/cm; pH values range from 7,69 - 7,83; 19 stations (95%) have COD values < 10 mg/l and 1 station (5%) has COD > 10 mg/l; and Ntotal values range from 0,6 - 3 mg/l. Based on drinking water quality standards, none of the stations meet the requirements for potable water; however, the groundwater can still be used for purposes such as bathing and washing.

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