Article Per Year (5 Year)
p-Index From 2020 - 2025
2.782
P-Index
This Author published in this journals
All Journal Jambura Journal of Educational Chemistry Jambura Journal of Chemistry Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Jurnal Ilmiah Kanderang Tingang JHTS Jurnal Ilmiah Dr. Aloei Saboe Damhil: Jurnal Pengabdian kepada Masyarakat Jurnal Pendidikan Kimia, Fisika dan Biologi Jurnal Teknologi Sumberdaya Mineral
Kostiawan Sukamto, Kostiawan
Unknown Affiliation
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Engineering Health Professions Medicine & Pharmacology Nursing Public Health Social Sciences Other

Published : 16 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 16 Documents
Search

 1   2 
Analysis of Hydroquinone Content in Whitening Cream Circulating in Gorontalo City Using Uv-Vis Spectrophotometry Jauria; Kostiawan Sukamto; Ariani Hutuba
Journal of Health, Technology and Science (JHTS) Vol. 3 No. 2 (2022): Journal of Health, Technology and Science (JHTS)
Publisher : LPPM Universitas Bina Mandiri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (402.813 KB) | DOI: 10.47918/jhts.v2i4.283

Abstract

This study aims to determine the content of hydroquinone in whitening cream circulating in the city of Gorontalo and to determine the level of hydroquinone in bleaching cream circulating in the city of Gorontalo. This research method is a designmixed methods, which is a rare research by combining two forms of approach in research, namely qualitative and quantitative. This study began with a qualitative analysis using FeCl3 and Benedict's reagents so that the results were obtained that from 8 samples of whitening cream (A, B, C, D, E, F, G, H) there were 2 samples of whitening cream containing hydroquinone, namely cream A and C. then continued with a quantitative test using UV VIS spectrophotometry. The result is that sample A contains 41,976 mg/g and sample C 28,430 mg/g then proceeds with the validation of the analytical method, the validation parameters include linearity, limit of detection (LOD) and limit of quantification (LOQ). carried out with the value of the correlation coefficient R = 0.9999 and LOD = 18.642 PPM, LOQ = 62.142 PPM.
Media Virtual Vs Media Konkret: Peningkatan Kompetensi Dalam Merepresentasi Erga Kurniawati; Thayban Thayban; La Alio; Kostiawan Sukamto
Jurnal Ilmiah Kanderang Tingang Vol 14 No 1 (2023): Jurnal Ilmiah Kanderang Tingang
Publisher : FKIP Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37304/jikt.v14i1.189

Abstract

Representational Competence (RC) can be enhanced with virtual and concrete media. However, the effectiveness of using virtual media is significantly different from concrete media. Recent studies do not fully confirm the use of virtual and concrete media because the materials used have a lower visuospatial level. This study uses a molecular symmetry material with a high visuospatial level. This study aims to compare the effectiveness of using concrete and virtual media on students' understanding of symmetry material. The research was conducted using a quasi-experimental design with 62 students as a sample. The comprehension test instrument has a reliability coefficient based on the Cronbach Alpha test of 0.897. Data analysis was performed with a two-way analysis of variance test. The results show that virtual media is more effective than concrete media in increasing RC and understanding molecular symmetry.
Karakterisasi Mineral dengan Analisis Sayatan Mineragrafi untuk Penentuan Mineralisasi Sphalerite (ZnS) Kostiawan Sukamto; Mohammad Zaki Mubarok; Ayub Pratama Aris; Ninasafitri Ninasafitri
Jambura Journal of Chemistry Vol 4, No 2 (2022): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jambchem.v4i2.17508

Abstract

Sphalerite is a mineral rich in Zinc and Iron is the main source of zinc metal production in the world. The purpose of this study was to determine the mineralization in the Cigudeg area, Bogor Regency, West Java, especially the mineralization of Zinc (Zn) by using mineragraphic analysis. Mineragraphic incision analysis is performed to describe the structure and composition of a mineral, the Physico-chemical properties of the mineral, and the presence of associated minerals in the sample. Based on the test results, the mineral component of sphalerite (ZnS) 40-45% as the most dominant component, often contains inclusions of very fine copper grains measuring less than 1 m to 5 m and quartz (SiO2) 10-15% is granular, as for sulfide ore minerals. Others such as chalcopyrite (CuFeS2), pyrite (FeS2), cuprite (Cu2O), and galena (PbS) are present in small amounts.
RECOVERY TEMBAGA DARI LARUTAN TEMBAGA SULFAT MELALUI METODE SEMENTASI MENGGUNAKAN BESI Kostiawan Sukamto
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 5 No. 2 (2023): Penelitian Kimia dan Terapannya
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v5i2.3086

Abstract

This study aims to optimize the copper recovery process from copper sulfate solution using the cementation method with iron as the precipitating agent. This method offers an efficient and sustainable solution to address the challenges of copper recovery from copper sulfate solutions, which has become increasingly crucial due to the declining supply of high-grade copper ore. The variables optimized in this research encompass the optimization of stirring speed (50 RPM to 300 RPM), iron addition (0.5 to 3 times the stoichiometric reaction), temperature (30 to 70°C), and reaction time (15 to 120 minutes). The research results indicate that the optimal conditions for copper recovery are achieved at a stirring speed of 200 RPM, iron addition of 2 times the stoichiometric reaction, a temperature of 70°C, and a reaction time of 120 minutes. Under these conditions, the percentage of copper recovery from the copper sulfate solution using the cementation method reaches 99.37%, demonstrating a high level of efficiency in this approach.
PERBANDINGAN AKTIVITAS ANTIOKSIDAN EKSTRAK DAN REBUSAN DAUN BAYAM MERAH (Amaranthus tricolor L.) DENGAN METODE DPPH: Doi: https://doi.org/10.47918/jhts.v3i1.334 Niuwa, Melanda; Sukamto, Kostiawan; Dukalang, Fildzah Istiqomah
Jurnal Ilmiah dr. Aloei Saboe Vol. 1 No. 2 (2021): Jurnal Ilmiah dr. Aloei Saboe
Publisher : LP2M Universitas Bina Mandiri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.062 KB) | DOI: 10.47918/jias.v8i2.1072

Abstract

Penelitian ini bertujuan untuk mengetahui perbandingan aktivitas antioksidan antara ekstrak dan rebusan daun bayam merah (Amaranthus Tricolor. L) dengan melihat perubahan warna pada uji skrining fitokimia. Metode penelitian yang digunakan pada penelitian ini menggunakan jenis penelitian deskriptif dan laboratorium dengan melihat perubahan warna pada uji skrining fitokimia. Dari hasil penelitian dapat ditentukan dengan melihat perbahan warna pada setiap sampel uji yang digunakan yaitu ekstrak daun bayam merah (Amaranthus Tricolor. L) dengan menggunakan reagen pereaksi. berdasarkan hasil penelitian uji skrining fitokimia daun bayam merah terkonfirmasi positif senyawa flavonoid, fenolik, tannin, terpenoid dan steroid.
Edukasi Pengolahan Emas Tanpa Merkuri di Kecamatan Taludaa, Kabupaten Bone Bolango Sukamto, Kostiawan; Lukum, Astin; Pou, Siti Nurhaliza; Abas, Dina
Damhil: Jurnal Pengabdian kepada Masyarakat Vol 3, No 2: December 2024
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/damhil.v3i2.29399

Abstract

The activity was conducted in Taludaa Sub-district, Bone Bolango Regency, with the aim of raising awareness among miners and the surrounding community about the dangers of mercury and introducing alternative gold processing methods that are more environmentally friendly. The program included socialization through lectures, discussions, educational video screenings, and training on mercury-free gold processing methods, such as gravity techniques and controlled cyanidation. Initial surveys revealed that more than 50% of miners still relied on mercury. The results demonstrated increased participant understanding, with 80% of them recognizing the health and environmental risks posed by mercury. Practical training also highlighted the effectiveness of alternative methods, with 75% of participants expressing confidence in adopting them. Nevertheless, challenges remain in terms of equipment access and the costs of implementing new technologies. This initiative has shown a positive impact in enhancing miners' awareness and skills, serving as a significant first step toward reducing mercury use in the region and promoting sustainability in artisanal gold mining activities.
STUDI PENGARUH VARIASI PH DAN KOLEKTOR PADA EFISIENSI FLOTASI MINERAL TEMBAGA SULFIDA Sukamto, Kostiawan; Lukum, Astin; La Kilo, Akram
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 1 (2025): Publikasi Penelitian Kimia dan Terapannya 2025
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i1.5152

Abstract

This study aims to investigate the effect of pH variations and collector types on the recovery efficiency and Cu content in copper sulfide mineral samples. The experiment was conducted by varying the pH (6, 8, 10, and 12) and using different types of collectors, namely Xanthate, Potassium Amyl Xanthate (PAX), Diethyl Dithiophosphate (DTP), and a combination of PAX + DTP. Control variables included flotation time (5, 10, 15, 20, and 25 minutes), collector concentration at 50 mg/L, particle size <75 µm, and the use of Frother Methyl Isobutyl Carbinol (MIBC) at a concentration of 10 mg/L. Modifiers such as NaOH and H₂SO₄ were used to adjust the pH, while Copper Sulfate (CuSO₄) served as an activator and Sodium Metabisulfite (Na₂S₂O₅) as a depressant. The results showed that variations in pH and collector types significantly influenced recovery efficiency and Cu content in the concentrate. In general, the highest recovery efficiency was achieved at pH 10 with the combination of PAX + DTP, which resulted in a higher Cu content compared to other single collectors. This combination was able to improve recovery efficiency to over 75%, with Cu content in the concentrate reaching 28%. Therefore, the findings suggest the use of a collector combination and pH optimization as strategies to enhance the performance of copper sulfide flotation.
Presipitasi Mixed Hydroxide Precipitate (MHP) dari Ekstraksi Nikel Laterit Sebagai Bahan Baku untuk Pembuatan Baterai : Tinjauan Proses Pembuatannya Ninasafitri ninasafitri; Ayub Pratama Aris; Kostiawan Sukamto
Jurnal Teknologi Sumberdaya Mineral Vol. 4 No. 1 (2023)
Publisher : Program Studi Teknik Pertambangan Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jeneral.v4i1.38652

Abstract

Indonesia merupakan salah satu negara yang memiliki cadangan bijih nikel laterit terbesar di dunia. Saat ini bijih nikel laterit berkadar rendah tersebut belum diolah secara maksimal menjadi produk yang bernilai tambah di dalam negeri. Proses ekstraksi yang banyak diterapkan di industri untuk bijih nikel laterit berkadar rendah adalah melalui jalur hidrometalurgi. Produk akhir dari proses hidrometalurgi dapat berupa logam Ni dan Co murni maupun produk antara (intermediate product). Salah satu produk antara yang banyak diproduksi adalah presipitat campuran nikel-kobalt hidroksida atau dikenal sebagai MHP (Mixed Hydroxide Precipitate). Presipitasi nikel hidroksida dari larutan hasil pelindian dilakukan pertama-tama dengan mengekstraksi nikel melalui proses pelindian dalam larutan asam sulfat. Selanjutnya pemisahan besi. Larutan yang sudah dipresipitasi besi-nya, selanjutnya digunakan dalam percobaan presipitasi nikel hidroksida. Presipitasi MHP dilakukan dengan menambahkan MgO atau NH3 sebagai agen penetralisasi. Untuk menghasilkan MHP yang berkualitas tinggi proses pemisahan besi dari larutan hasil pelindian dan presipitasi nikel dan kobalt dari larutan yang telah dipisahkan besinya harus dilakukan pada kondisi tertentu. Beberapa parameter yang harus dipenuhi untuk menghasilkan produk MHP yang berkualitas tinggi yaitu kemurnian larutan umpan, pH, suhu, waktu presipitasi danpenambahan seed.
Pembuatan Nano Kitosan dengan Metode Gelasi Ionik Menggunakan SEM (Scanning Elektron Microscopy) Pratiwi One; Astin Lukum; La Alio; Erni Mohamad; Kostiawan Sukamto
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 4 (2025): Juli: Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v1i4.344

Abstract

This study aims to determine how nano chitosan is produced through the ionic gelation method. The process of making nano chitosan is carried out using variations in chitosan concentrations of 1%, 5%, and 10%, and using a magnetic stirrer. Morphological tests were carried out using Scanning Electron Microscopy (SEM) to observe the shape and size of the particles formed. The addition of TPP (Trisodium Tripolyphosphate) as a crosslinker and certain surfactants are used to increase particle stability. Treatment for ±2 hours showed optimal results in terms of a more homogeneous particle size distribution. Based on the results of SEM observations, it is known that increasing the concentration and time settings and the use of appropriate surfactants can reduce wrinkles in nano chitosan particles. The particle size obtained is in the range of 278–350 nm. Thus, the ionic gelation method has proven effective in producing uniform nano chitosan and has good morphology for further applications.
Edukasi Pemurnian Logam Tembaga melalui Elektrolisis untuk Siswa SMA Terpadu Wira Bhakti Gorontalo Sukamto, Kostiawan; Lukum, Astin; La Kilo, Akram; Kunusa, Wiwin Rewini
Damhil: Jurnal Pengabdian kepada Masyarakat Vol 4, No 1: June 2025
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/damhil.v4i1.33074

Abstract

This community service activity aims to provide students at SMA Terpadu Wira Bhakti Gorontalo with an understanding of the copper purification process through electrolysis and the application of environmentally friendly technology in the metallurgy industry. The activity was carried out using a combined approach of theoretical instruction and direct laboratory practicum. Students learned the basic principles of electrolysis, the mechanism of copper purification, and how this technology reduces environmental impact compared to traditional methods. During the practicum, students had the opportunity to apply the theory they had learned, observe the electrolysis process, and understand the results of copper purification. The evaluation results indicate that the activity was effective in enhancing students' understanding of electrolysis and the importance of sustainable technology in the industry. Additionally, the activity successfully sparked students' interest in the field of engineering and environmentally friendly industries.
Co-Authors Abas, Dina Akram La Kilo Ariani H. Hutuba Aris, Ayub Pratama Arviani, Arviani Astin Lukum Dilapanga, Windi Dukalang, Fildzah Istiqomah Erga Kurniawati Erni Mohamad Haris Munandar Jauria Kadir Kilo, Ahmad Kamumu, Isal La Alio La Alio La Ode Aman Mardjan Paputungan Masrid Pikoli Mohammad Zaki Mubarok Najmah, Najmah Ninasafitri, Ninasafitri Nita Suleman Niuwa, Melanda Pahrun, Abdul Wahab Polamolo, Adelia Nur Pou, Siti Nurhaliza Pratiwi One Rauf, Nuramna Thayban, Thayban Umar, Ahmat Sudir Wiwin Rewini Kunusa