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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
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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

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STUDI KINETIKA EKSTRAKSI TEMBAGA DARI BIJIH ENARGIT DALAM LARUTAN ASAM SULFAT Sukamto, Kostiawan; Kamumu, Isal; Kadir Kilo, Ahmad; La Kilo, Akram
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.6239

Abstract

This study investigates the kinetics of copper extraction from enargite ore (Cu₃AsS₄) using sulfuric acid (H₂SO₄) solution with hydrogen peroxide (H₂O₂) as an oxidizing agent. Leaching experiments were carried out under various operating conditions, including H₂SO₄ concentrations (1, 1.5, and 2 M), H₂O₂ concentrations (1, 1.5, and 3 M), solid percentages (5%, 10%, and 15%), and temperatures (30, 40, and 50 °C), with a leaching time of up to 480 minutes. The results indicated that higher concentrations of H₂SO₄ and H₂O₂ significantly enhanced copper extraction efficiency, while increasing solid percentage reduced the leaching performance. The optimum condition was achieved at 2 M H₂SO₄, 3 M H₂O₂, 5% solids, and 50 °C, resulting in a maximum copper extraction of 97.95%. Kinetic analysis revealed that the leaching process was predominantly controlled by diffusion through a porous product layer based on the shrinking core model, but shifted to interface reaction control at higher temperatures. These findings provide new insights into the leaching mechanism of enargite ore and serve as a foundation for developing more efficient and environmentally friendly hydrometallurgical processes for copper recovery.
Analisis Miskonsepsi Materi Pereaksi Pembatas Menggunakan Tes Three Tier Multiple Choice Polamolo, Adelia Nur; Lukum, Astin; Sukamto, Kostiawan
Jambura Journal of Educational Chemistry Vol 4, No 1 (2022): February
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jjec.v4i1.13180

Abstract

Penelitian ini bertujuan untuk menganalisis miskonsepsi siswa pada materi pereaksi pembatas kelas XI IPA MAN 1 Kota Gorontalo. Metode penelitian yang dilakukan adalah deskriptif kuantitatif. Instrumen yang digunakan adalah tes Three Tier Multiple Choice. Tes instrumen yang digunakan telah diuji menggunakan uji validitas konstruk dan uji reliabel. Subjek penelitian yang digunakan adalah kelas XI IPA MAN 1 Kota Gorontalo dengan jumlah sampel 178 siswa yang diambil dari 5 kelas. Hasil penelitian menunjukkan bahwa sebagian besar siswa mengalami miskonsepsi diseluruh indikator dengan kategori miskonsepsi 1 (MK1) memiliki persentase sebesar 12,2%, miskonsepsi 2 (MK2) memiliki persentase sebesar 9,4%, dan miskonsepsi 3 (MK3) memiliki persentase sebesar 34,6%.
Peningkatan Model Pembelajaran Cooperatif Scripting dengan Keterampilan Proses untuk Meningkatkan Motivasi dan Hasil Belajar Kimia Munandar, Haris; Najmah, Najmah; Kurniawati, Erga; Thayban, Thayban; Arviani, Arviani; Sukamto, Kostiawan
Jambura Journal of Educational Chemistry Vol 4, No 2 (2022): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jjec.v4i2.15732

Abstract

This Classroom Action Research aims to apply the Cooperative Scripting Learning Model to improve motivation and learning outcomes at SMA YP PGRI 2 Makassar. The research subjects were students of class XI IPA, totalling 35 students. The implementation of this research consisted of two cycles, each consisting of three meetings and one evaluation meeting. The learning outcomes that have been carried out have an increase in the category of student learning outcomes, in the first cycle in the medium category, namely 20 students or 57.14%, while in the second cycle, 17 people or 48.57%. The average increase in student motivation in cycle 1 was 60.57% and cycle II was 75.43%, as well as an increase in student learning mastery in cycle I, namely 24 people or 68.57% and an increase in cycle II as many as 31 people or 88, 57%. Thus, it can be concluded that the cooperative scripting biology learning model with process skills can increase the motivation and learning outcomes of class XI IPA SMA YP PGRI 2 Makassar.
Identifikasi Pemahaman Konsep Siswa Pada Materi Ikatan Kimia Menggunakan Tes Diagnostik Three Tier Multiple Choice Umar, Ahmat Sudir; Lukum, Astin; Dilapanga, Windi; Kilo, Akram La; Aman, La Ode; Alio, La; Sukamto, Kostiawan; Pahrun, Abdul Wahab
Jambura Journal of Educational Chemistry Vol 5, No 1 (2023): February
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jjec.v5i1.18984

Abstract

Penelitian ini bertujuan untuk mengidentifikasi pemahaman konsep siswa pada materi ikatan kimia kelas XI IPA SMA N 1 Telaga Biru. Metode penelitian yang dilakukan adalah kualitatif deskriptif. Instrument yang dilakukan adalah tes diagnostik Three Tier Multiple Choice. Subjek penelitian yang digunakan adalah kelas XI IPA SMA Negeri 1 Telaga Biru dengan jumlah sampel sebanyak 76. Data penelitian diperoleh dari jawaban siswa pada soal tes Three Tier Multiple Choice. Data tersebut diolah berdasarkan pola jawaban siswa yang dikelompokan kedalam tiga kategori yaitu Paham Konsep, Tidak Paham Konsep dan Miskonsepsi. Pada hasil penelitian menunjukan bahwa kategori kemampuan pemahaman konsep memiliki presentase yang paham konsep sebesar 15, Tidak Paham Konsep sebesar 27 dan Miskonsepsi diperoleh presentase sebesar 58. Berdasarkan presentase ditemukan bahwa pengetahuan siswa kelas XI IPA SMA Negeri 1 Telaga Biru termasuk pada kategori Miskonsepsi dengan kriteria tinggi.
Identifikasi Pemahaman Konsep Siswa pada Materi Termokimia Menggunakan Tes Diagnostik Three-Tier Multiple Choice Suleman, Nita; Lukum, Astin; Rauf, Nuramna; Paputungan, Mardjan; Alio, La; Sukamto, Kostiawan
Jambura Journal of Educational Chemistry Vol 5, No 2 (2023): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jjec.v5i2.13255

Abstract

This research is descriptive qualitative research, which aims to determine students' concept understanding of thermochemistry in class XI SMA Negeri 1 Gorontalo. The instrument used was a Three-tier multiple-choice Diagnosis Test. The research subject used was class XI IPA SMA Negeri 1 Gorontalo, with a sample size of 42 students. The research data was obtained from students' answers to the Three-tier multiple-choice questions. The data was processed based on the pattern of student answers, which were then grouped into the categories of conceptual understanding, misconceptions, and not conceptual understanding. The results showed that students who understood the concept were 46.19%, misconceptions were 43.97%, and did not understand the concept by 9.84%.
Sosialisasi Dampak Penggunaan Merkuri pada Pekerja Tambang Rakyat di Desa Buladu, Kecamatan Sumalata Timur, Kabupaten Gorontalo Utara Sukamto, Kostiawan; Lukum, Astin; Pikoli, Masrid; Kilo, Akram La
Damhil: Jurnal Pengabdian kepada Masyarakat Vol 3, No 1: June 2024
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/damhil.v3i1.26821

Abstract

The awareness campaign on the impact of mercury use among artisanal miners in Buladu Village, East Sumalata District, North Gorontalo Regency, aimed to enhance knowledge about the dangers of mercury and introduce safer alternative mining methods. The event saw enthusiastic participation from 75 attendees, including miners, their families, and community representatives. The activities included pre-tests and post-tests, which showed a significant increase in participants' knowledge, with average scores rising from 45% to 85%. Interactive discussions and practical workshops revealed a high interest in understanding and adopting mercury-free mining methods. While some participants did not fully grasp the material, the majority rated the relevance of the information and the quality of the speakers as very good. Overall satisfaction was high, with 85% of participants feeling satisfied or very satisfied, and 80% expressing interest in further training. The survey also indicated a need for additional support, such as training, technical assistance, and ongoing education. Regular monitoring and the formation of working groups or cooperatives among miners are recommended to facilitate the implementation of alternative technologies and knowledge sharing. With appropriate follow-up actions, this initiative is expected to have a sustainable positive impact on the health and well-being of miners and the environmental preservation in Buladu Village.
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