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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Riset Kimia Jurnal Zarah Jurnal Penelitian Pendidikan IPA (JPPIPA) Al-Kimia ALCHEMY Jurnal Penelitian Kimia JURNAL PENDIDIKAN TAMBUSAI Jurnal Ilmiah Pendidikan Scholastic Global Conference Index Pelita Eksakta Indonesian Journal of Chemical Science and Technology CHEDS: Journal of Chemistry, Education, and Science Jurnal Pijar MIPA MASALIQ: Jurnal Pendidikan dan Sains International Journal of Innovation in Mechanical Engineering and Advanced Materials Ta'dib Jurnal Pendidikan MIPA
Budhi Oktavia
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Religion Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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Perbandingan Metode Spektrofotometri dan ICP dalam Penentuan Kesadahan Air Syukro, Fahilatul; Oktavia, Budhi
MASALIQ Vol 5 No 6 (2025): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i6.7598

Abstract

Water is a vital resource whose quality must be ensured for safe consumption and industrial use. One critical parameter in assessing water quality is hardness, typically caused by the presence of calcium (Ca²⁺) and magnesium (Mg²⁺) ions. High levels of hardness can lead to negative effects such as scale formation on equipment, reduced efficiency of boilers and turbines, and potential health issues. This study aims to compare water hardness analysis results obtained using two instruments—Spectrophotometer DR 3900 and Inductively Coupled Plasma (ICP) Perkin Elmer 3800—to identify the strengths and limitations of each method. The research was conducted experimentally using soft water samples collected from boiler piping. Spectrophotometric analysis was based on the Lambert-Beer law by measuring absorbance after adding a complexing reagent, while ICP analysis involved nebulization of filtered and acidified samples using concentrated HNO₃. The results showed that the concentrations of Ca and Mg in the samples were below the hardness threshold (<1 ppm). The highest total hardness measured using the spectrophotometer was 0.524 ppm, while the highest value obtained via ICP was 0.652 ppm. Although both methods produced comparable data, ICP demonstrated superior sensitivity and accuracy, albeit with higher costs and procedural complexity. The study concludes that ICP is recommended for high-sensitivity hardness analysis, whereas the spectrophotometer is more suitable for routine, efficient, and cost-effective testing.
Optimasi Viscosity Reducer dalam Mitigasi Minyak Mentah yang Mengental dari Sumur X Yona, Nuzulia Rahma; Oktavia, Budhi
MASALIQ Vol 5 No 6 (2025): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i6.7611

Abstract

Crude oil from Well X contains both hydrocarbon and non-hydrocarbon components, and during its transportation from Field D to Port E, it encounters technical challenges due to wax formation at low temperatures. This wax formation increases the crude oil’s viscosity, complicating the pumping process and raising operational costs. This study aims to reduce the viscosity of crude oil by injecting a chemical viscosity reducer at various doses: 0 ppm, 500 ppm, 1000 ppm, 1500 ppm, and 2000 ppm. The method involved viscosity testing following the addition of the chemical viscosity reducer at each dose level. The results indicate that the optimal dose is 2000 ppm, which successfully reduces the average viscosity from 604 cP to 313 cP. This reduction is attributed to the interaction of non-polar compounds in the chemical viscosity reducer that dissolve wax and inhibit paraffin crystallization, as well as polar compounds that disperse asphaltene molecules. These findings demonstrate the effectiveness of chemical viscosity reducers in enhancing crude oil transport performance and operational efficiency, particularly under low-temperature environmental conditions.
Analisis Ion Magnesium (Mg²⁺) dengan Kromatografi menggunakan Silika Gel-GPTMS Termodifikasi Sulfonat sebagai Fasa Diam Ditasya, Hellena; Oktavia, Budhi
MASALIQ Vol 5 No 6 (2025): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i6.7641

Abstract

The limited number of studies on the use of modified silica gel as a stationary phase in ion chromatography, particularly for magnesium ion (Mg²⁺) analysis, forms the basis of this research. The primary objective is to modify silica gel with 3-glycidyloxypropyltrimethoxysilane (GPTMS) and sulfonate groups to develop a novel stationary phase selective for Mg²⁺ analysis. A quantitative experimental method was employed using Mg²⁺ samples at concentrations of 100, 200, and 300 ppm. Analysis was conducted using High-Performance Liquid Chromatography (HPLC) with two types of eluents: tartaric acid (0.05 M, 0.07 M, 0.09 M) and methanesulfonic acid (0.01 M). The results show that tartaric acid failed to produce distinct chromatographic peaks at all concentrations, likely due to its low ionic strength, which caused Mg²⁺ ions to remain strongly bound to the stationary phase, resulting in signal-to-noise (S/N) ratios below the quantification limit. In contrast, methanesulfonic acid generated sharp peaks with a retention time of 7.47 minutes, peak height of 53.68 mAU, and peak area of 4.42, indicating effective Mg²⁺ detection. These findings suggest that the high ionic strength of methanesulfonic acid makes it a more suitable eluent for silica gel GPTMS-sulfonate-based ion-exchange chromatography systems. The main conclusion of this study is that GPTMS-sulfonate silica gel exhibits high potential as a stationary phase for Mg²⁺ ion analysis using ion chromatography, with optimal performance when methanesulfonic acid is used as the eluent.
Development of Guided Discovery Based Stoichiometry E-Modules to Improve Students' Science Literacy Harnas, Dolla Mulyana; Oktavia, Budhi; Azhar, Minda; Dewata, Indang; Pikoli, Masrid
Jurnal Pendidikan MIPA Vol 23, No 3 (2022): Jurnal Pendidikan MIPA
Publisher : FKIP Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This research aims to create e-modules based on guided discovery learning that are effective, practical, and support student learning. The research type uses research and development (R&D) using a 4-D model with four steps: definition, design, development, and dissemination. This tool is in the form of a questionnaire on effectiveness and feasibility. Elastic modulus is verified by her 6 validators. Data were analyzed according to the Aikens V formula and percent utility. In the analysis of content validity and technical rating, the average V of Aikens with high valid categories was 0.85 and 0.83. Teacher and student ratings of the practicality questionnaire data were 82% and 83% in the highly practical category. Data analysis shows that young's modulus has high validity and practicality. Therefore, it can be concluded that e-modules based on guided discovery learning are effective, practical, and categorized as teaching materials that improve students' scientific literacy.Keywords: e-module, stoichiometry, guided discovery learning, science literacy.
UJI KONDISI OPTIMUM DESORPSI ANION FOSFAT (PO43-) DENGAN SILIKA GEL TERMODIFIKASI DIMETILAMINA Yunisya, Dinda; Oktavia, Budhi
CHEDS: Journal of Chemistry, Education, and Science Vol 6, No 2 (2022)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v6i2.6073

Abstract

Salah satu metode untuk memisahkan anion fosfat adalah adsorpsi. Adsorben yang memiliki banyak minat adalah silika gel. Silika gel telah berhasil dimodifikasi menggunakan dimetilamina sehingga menghasilkan gugus aktif amina yang dapat mengikat anion fosfat. Gugus aktif yang dihasilkan tersebut  mampu digunakan sebagai pemisah atau penukar ion. Untuk mengetahui kemampuan dari silika gel termodifikasi dimetilamina tersebut, maka dapat dilakukan desorpsi dengan metoda kolom. Dalam proses desorpsi, eluen yang digunakan yaitu HCl dan H2SO4. Tujuan penelitian ini adalah menentukan jenis eluen dan konsentrasi optimum eluen dalam mendesorpsi anion fosfat dari silika gel termodifikasi DMA. Berdasarkan hasil penelitian jenis eluen yang didapatkan dari hasil desorpsi anion fosfat adalah H2SO4. Konsentrasi H2SO4 di variasikan yaitu 0,03 M, 0,05 M, 0,1 M, 0,15 M, 0,2 M, 0,25 M dan 0,3 M. Konsentrasi optimum asam sulfat yang didapatkan adalah 0,2 M dengan jumlah terdesorpsi 0,021049 mg yang memiliki persen desorpsi 81,51%.
KONDISI OPTIMUM DESORPSI ANION NITRIT DARI SILIKA GEL TERMODIFIKASI DIMETILAMINA MENGGUNAKAN HCL DAN H2SO4 Maulana, Febrina; Oktavia, Budhi
CHEDS: Journal of Chemistry, Education, and Science Vol 6, No 2 (2022)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v6i2.6074

Abstract

Silika merupakan senyawa terbanyak penyusun kerak bumi. Silika banyak dimanfaatkan sebagai adsorben, prekonsentrasi atau pemisahan analit. Modifikasi silika dengan dimetilamina mampu meningkatkan kapasitas adsorpsi. Pada penelitian ini, dilakukan adsorpsi dan desorpsi anion nitrit pada silika termodifikasi dimetilamina (DMA) menggunakan metode kolom. Setelah anion nitrit diadsorpsi dilanjutkan dengan proses desorpsi yang bertujuan untuk mengetahui kondisi optimum desorpsi anion nitrit dari silika gel termodifikasi DMA menggunakan eluen asam (HCl dan H2SO4). Berdasarkan hasil penelitian didapatkan kapasitas adsorpsi pada silika sebesar 0,00908 mg/gr, berat anion nitrit yang terserap 0,00454 mg dengan persentase penyerapan sebesar 47,27%. Persentase desorpsi anion nitrit menggunakan HCl sebesar 78,32% dengan melepaskan anion nitrit sebanyak 0,003528 mg. Sedangkan persentase desorpsi anion nitrit menggunakan H2SO4 sebesar 50,30% dengan melepaskan anion nitrit sebanyak 0,002274 mg. Konsentrasi optimum HCl yaitu 0,05M, dapat melepaskan anion nitrit sebanyak 0,00425 mg dengan persentase desorpsi sebesar 92,45%.
DESORPSI NITRAT (NO3-) DARI SILIKA GEL TERMODIFIKASI DIMETILAMINA (DMA) MENGGUNAKAN ELUEN ASAM Yanti, Desvila Ramadha; Oktavia, Budhi
CHEDS: Journal of Chemistry, Education, and Science Vol 6, No 2 (2022)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v6i2.6072

Abstract

Desorpsi merupakan proses terlepasnya baik ion ataupun molekul yang menempel atau terserap pada adsorben. Proses ini dimanfaatkan dalam regenerasi suatu adsorben agar adsorben dapat digunakan kembali saat sudah jenuh.  Pada penelitian ini, desorpsi dilakukan terhadap anion nitrat yang telah terserap pada adsorben berupa silika gel yang termodifikasi DMA menggunakan metode kolom. Tujuan dilakukan penelitian ialah untuk melihat eluen mana yang memberikan persen desorppsi lebih tinggi antara H3PO4 0,03 M dan H2SO4 0,03 M, lalu eluen dengan persen desorpsi lebih tinggi ini ditentukan konsentrasi optimumnya dalam mendesorpsi. Berdasarkan eluen yang diuji, H2SO4 memiliki persen desorpsi yang lebih tinggi yaitu 66,22%, sedangkan H3PO4 62,41%. Pada variasi konsentrasi H2SO4 didapatkan kondisi optimum pada 0,10 M dengan persen desorpsi 80,89% atau melepaskan 0,0684 mg NO3- dari 0,0851 mg yang terserap pada silika gel termodifikasi DMA.
Effect Type of Desorption Eluent and Concentration in Desorption of Zn2+ Cation from Sulfonate Modified Silica Gel-GPTMS (Glycydoxypropyltrimethoxysilane) Adsorbent Hafis, Muhamad; Oktavia, Budhi; Alizar, Alizar; Warda Ningsih, Sherly Kasuma
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 7 No. 2 (2024): JULY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i2.62256

Abstract

Silica has silanol groups contained in it which have low binding ability because it has low acidity, resulting in low absorption effectiveness on silica. In order to improve the properties and to expand the field of utilization, a modification process is carried out on silica gel using GPTMS bridging compounds and sulfonate salts as modifiers. The study explains that CaCl2.2H2O with a desorption percent of 97.25% has a greater ability than NaCl which is only 83.93% in the desorption of Zn2+ cations. The study also explains that the optimum concentration of CaCl2.2H2O eluent in the desorption of Zn2+ cations is at 1mmol/L where the desorption yield is 93.74%.
Development of Problem-Based Learning Student Worksheet Integrated with Ethnoscience on Acid-Base Material Marthin, Emmilya Febri; Hardeli; Oktavia, Budhi; Kurniawati, Desy
Jurnal Penelitian Pendidikan IPA Vol 10 No 7 (2024): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i7.7930

Abstract

This study aims to develop problem-based learning student worksheets integrated with ethnoscience on acid-base materials that are valid and practical. This research uses a development research method (Research and Development) with a 4-D model. The data of this study were collected through validity sheets completed by 4 validators, namely 2 chemistry lecturers and 2 chemistry teachers, and with a practicality questionnaire sheet completed by 2 chemistry teachers and by 35 students of SMAN 1 Batusangkar as respondents. Data were analyzed using quantitative descriptive method, using Aiken’s V. The result for content validity is 0.88 and construct validity is 0.90 with valid category. The result for teachers practicality is 0.95 and students practicality is 0.82 with practical category. Based on the results of the research that has been conducted, it can be concluded that the development of problem-based learning-based student worksheets integrated with ethnoscience on acid-base material is valid and practical.
Development of E-Module Acid-Base Based on Problem Based Learning Oriented Chemo-Entrepreneurship to Improve Student’s Critical Thinking Skills Putri, Hanna Salwa; Oktavia, Budhi; Yerimadesi; Alizar
Jurnal Penelitian Pendidikan IPA Vol 10 No 7 (2024): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i7.7943

Abstract

Acid-base is one of the important materials in chemistry learning. Based on preliminary analysis, it is known that students have not properly understood the concept of acid-base. This study aims to develop an acid-base e-module, analyze its validity, practicality, and effectiveness on critical thinking skills. This research method is development research with the Plomp development model. The e-module was validated by 5 valitadors. The practicality test was conducted on 28 students and 3 teachers. The effectiveness of the e-module is seen from the increase in critical thinking test score from 57 students. Validity and practicality were analyzed using Aiken's V, while effectiveness was analyzed with N-Gain. The results showed that the developed e-module had a validity value of 0.89 with a valid category; a practicality value of 0.87 by students and 0.97 by teachers with a practical category. The effectiveness results show that the e-module has an effect on students' critical thinking skills, as evidenced by the N-Gain score of the experimental class of 0,7 with a fairly effective category while the N-Gain score of the control class is 0,4 with a less effective category. Thus, the developed e-module is declared valid, practical, and effective.
Co-Authors Afifi, Rayhanil Afrilia, Yoni Ahmad Fauzi Ali Amran Alizar Alizar Alizar, Alizar Alsa, Dzakma Putri Amalia Putri Lubis Ananda Putra Andreas Difa Andromeda Anggraini Mardhatillah, Leonyta Anisa Nahari Auzakiyah, Sabella Ayu Azizah Bahrizal Bahrizal Berlian, Syakhinah Burma, Resna Chindikia, Ilmy Deasy Liestianty Delfitri Delfitri Deni Marlina DESY KURNIAWATI Desy Kurniawati Desy Kurniawati Deva Indriyani Devita Efri Dewi Kristina Dipnorita Retno Ditasya, Hellena Dwi Agustini, Dwi Dwi Putri, Vika Trisna DWI RAMADHANI Edi Nasra Elvina Elvina Elvina Yulistia Erwan Fadhilatu Zikra Fajriah Azra Faradila, Putwi Ayu Fauzi, Ahmad Firmansyah Khairul Kamal Fitrah Mey Harmi Siregar Fitri Amelia Fitriningsih, Annisa Guspatni Guspatni Habibur Rahman Dafnaz Hafis, Muhamad Hainunnisa Syafitriza Hardeli Hardeli Hardeli Hardeli Hardeli Harmaiyani, Risky Harnas, Dolla Mulyana Hary Sanjaya Hary Sanjaya Hesty Parbuntari Ibrahim Rahmat Illa Ramadhani Indang Dewata Isra Hayati Kauri, Desrike Khairani - Khairani - Latisma Latisma Ma’a, Yustini Maharani, Siska Marthin, Emmilya Febri Masrid Pikoli Maulana, Febrina Mawardi Meri Novia Nurman Miftahul Khair Miftahul Khair Miftahurrahmi, Miftahurrahmi Minda Azhar Muhammad Amin Muhammad Farhan Mulia, Melindra Mutiara Oksyarni Nahdiah Amin Nilu Gussarsi Nizar, Umar Kalmar Nofri Yuhelman Nur Hafni Hasibuan Parbuntari, Hesty Patricia Helena Pebriani Pebriani Pernadi, Niza Lian Putra, Ananda Putri Fatimah Putri Permatasari, Putri Putri, Hanna Salwa Putri, Reza Athia Putri, Yunisa Anugrah Rahadian Zainul Rahardian Z Rahmi, Fathaniah Raviqa Randy Lesmana Putra Rela Faradina Reviana Ervita Riga, Riga Rini Anggraini Rita Sundari Rita Sundari Riva Silvia Romy Dwipa Yamesa Away Sabrina, Joya Sari, Trisna Kumala Septya Anggraini Setiowati, Fiqih Sekar Sherly Kasuma Warda Ningsih Sherly Kasuma Warda Ningsih Sintha Hafizhah Yonel Sri Benti Etika Sri Benti Etika Sri Teguh Priharti Suryelita . Syamsi Aini Syifa Rahma Ayunda Syukro, Fahilatul Takdib, Manajer Jurnal Tarmizi Tarmizi Tarmizi Tarmizi Trihanto Setiadi Ulianas, Alizar Umar Kalmar Nizar Umar Kalmar Nizar Usman Bakar Visca Alisia Arianti Vivi Chaniasi Warni Arfin Wirza, Vitratul Yani Puspita Yani Yanti, Desvila Ramadha Yerimadesi Yona, Nuzulia Rahma yuda pratama Yulia Mona Liza Yunisya, Dinda Yustini Ma’a Zulmariko