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All Journal CHEMISTRY PROGRESS Jurnal Matematika & Sains MAJALAH BIAM Indonesian Journal of Chemistry Biosel: Biologi Science and Education Chemistry Indonesian Journal of Chemical Research Eksakta : Berkala Ilmiah Bidang MIPA Molekul: Jurnal Ilmiah Kimia Fullerene Journal of Chemistry Molluca Journal of Chemistry Education (MJoCE) Biofaal Journal Innovation for Community Service Journal Kalwedo Sains (KASA)
Yusthinus T. Male
Patimura University
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Social Sciences Other

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Dari Teori ke Aksi: Eksperimen Kimia Sederhana untuk Siswa di SMA Negeri 5 Maluku Tengah Joris, Shielda Natalia; Maahury, Mirella Fonda; Male, Yusthinus Thobias
Innovation for Community Service Journal Vol 3 No 2 (2025): Oktober 2025
Publisher : Department of Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/icsj.v3i1.21674

Abstract

Kegiatan pengabdian kepada masyarakat ini dilatarbelakangi oleh keterbatasan fasilitas laboratorium di SMA Negeri 5 Maluku Tengah yang membuat siswa jarang berinteraksi langsung dengan konsep kimia secara praktis. Padahal, minat belajar dan rasa ingin tahu ilmiah siswa akan tumbuh apabila mereka mendapatkan pengalaman belajar yang menyenangkan dan aplikatif. Oleh karena itu, tim dosen Jurusan Kimia FMIPA Universitas Pattimura melaksanakan kegiatan berupa demonstrasi eksperimen kimia sederhana yang mudah dilakukan dengan bahan-bahan sekitar. Metode kegiatan mencakup perancangan eksperimen, penyusunan booklet pembelajaran, koordinasi dengan pihak sekolah, pelaksanaan demonstrasi, dan evaluasi respon siswa. Eksperimen yang ditampilkan meliputi indikator alami asam–basa, pesan rahasia dengan tinta lemon, dan lava lamp sederhana. Hasil kegiatan menunjukkan peningkatan antusiasme siswa, keterlibatan aktif dalam mencoba eksperimen, serta munculnya keberanian untuk bertanya dan berdiskusi. Luaran kegiatan berupa booklet, berita pada laman Jurusan Kimia, serta dokumentasi video pada kanal YouTube. Dengan demikian, kegiatan ini berhasil menjadi langkah awal dalam memotivasi siswa untuk lebih mencintai pembelajaran kimia serta memperkuat kerja sama universitas dengan sekolah mitra.
Analysis Of Mineral Types And Contents Of Copper (Cu) And Lead (Pb) In Copper Mining Area In Wetar Island Male, Yusthinus T.; Bijang, Catherina M.; Naharuik, Sintia
Kalwedo Sains (KASA) Vol 1 No 2 (2020): Kalwedo Sains (KASA), September 2020
Publisher : Program Studi Di Luar Kampus Utama Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/kasav1i2p96-102

Abstract

The research to determine content of metal Cu and Pb in six samples (three ore rocks and three waste rocks) in the copper mining area on Wetar Island. The results showed that the highest concentration of Cu metal for ore rocks was in the first sample (MS KK) of 106,800 ppm and the smallest Cu concentration was in the third sample (PBx 1 KK) of 411 ppm. While the largest concentration of Cu metal waste rock is the first sample (Vol 1 KK) is 1.894 ppm and the smallest Cu metal concentration is in the second sample (BA 1 KK) is 310 ppm. As for the concentration of metal Pb in the largest ore rocks is in the first sample (MS KK) of 9,890 ppm, the small metal concentration of Pb is in the third sample (PBx 1 KK) is 660 ppm and the concentration of metal Pb for waste rock is found only in the first sample (Vol 1 KK) with a concentration of 1,631 ppm. This study shows that Wetar Island contains high copper and lead deposits.
Immobilization of Humic Acid on Chitosan and Its Application as an Adsorbent for Mercury (Hg²⁺) Ions in Freshwater Media Uktolseya, Lady Diana; Male, Yusthinus T; Tehubijuluw, Hellna
Jurnal Kimia Fullerene Vol 11 No 1: Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v11i1.750

Abstract

Mercury (Hg²⁺) contamination in freshwater is a serious global environmental issue, posing toxic effects on both human health and aquatic ecosystems. This study aims to immobilize humic acid onto chitosan and evaluate its effectiveness as an adsorbent for mercury ions (Hg²⁺) in a freshwater medium. Humic acid was isolated from peat soil and characterized using Fourier Transform Infrared (FTIR) Spectroscopy. Commercial chitosan was used as the supporting matrix. The immobilization process was carried out by mixing humic acid and chitosan solutions under controlled pH conditions. The resulting humic acid–chitosan adsorbent was then tested for its adsorption capacity toward mercury ions at various initial concentrations. FTIR characterization results confirmed the successful immobilization of humic acid onto chitosan, as indicated by the appearance of characteristic absorption bands corresponding to functional groups from both components. Adsorption tests showed that the humic acid–chitosan adsorbent exhibited a significant ability to remove mercury ions from freshwater, with optimum adsorption observed at a concentration of 100 ppm. The maximum adsorption capacities of humic acid, chitosan, and humic acid–chitosan were 99.83 mg/g, 99.90 mg/g, and 99.89 mg/g, respectively. This study provides important scientific insights into the potential of humic acid immobilized on chitosan as an alternative material for reducing heavy metal pollution in aquatic environments
Isolation and Characterization of Humic Acid from Soil Humus from Ahuru Area, Ambon Island, and its Application as Adsorbent for Metal Ions Cu(II) and Pb(II) Male, Yusthinus Thobias; Kapressy, Blessing H; Tanasale, Matheis Matheis Frits Jan David Pieter; Nurwidah, Andi
Indonesian Journal of Chemical Research Vol 13 No 3 (2026): Edition for January 2026
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2026.13-yus

Abstract

Research on the isolation and characterization of humic acid from soil humus in the Ahuru area, Ambon Island, has been conducted. The isolation and purification of humic acid were carried out using an extraction method based on its solubility in a 0.1 M NaOH solution and precipitation in 6 M HCl. Based on the research findings, the humic acid content was determined to be 8.53%. Characterization was performed using an FTIR spectrophotometer to analyze the absorption profile and functional groups present in the isolated humic acid. The characterization results revealed that humic acid contains alcoholic and phenolic OH groups, aromatic C=C, carboxylic C=O, and conjugated alkenes with ketone C=O. The isolated humic acid was then utilized as an adsorbent for Cu(II) and Pb(II) metal ions at an optimum pH of 5, with a contact time of 60 minutes for Cu(II) metal ions and 90 minutes for Pb(II) metal ions. The study results indicated that the adsorption pattern for Cu(II) metal ions followed the Langmuir adsorption isotherm model, with an adsorption capacity of 928.54 mg/g at a concentration of 200 mg/L. Meanwhile, the adsorption capacity of humic acid for Pb(II) metal ions was 795.97 mg/g at a concentration of 200 mg/L.
Co-Authors Abraham Mariwy Amos, Matthew Adi Honey Anakotta, Jaicson G. Anjarnita Haupea Asriningsih, Asriningsih Baharudin, Muh. Daswar A. Banjar, Firman Batawi, Chudeya Y. Bijang, Catherina M. Bijang, Catherina Manukpadang Bijang, Chaterina Manukpadang Claudia F Talaud Djulia Onggo Djulia Onggo Dolaitery, Lois Mikhal DOMINGGUS MALLE El, Rahma Fahrul Rozy Fakaubun Fransina, Eirene G. Gaspersz, Nelson Hanoch J Sohilait Hattu, Nikmans Hellna Tehubijuluw Herland Satriawan I Wayan Sutapa IRSAN . Irsan Irsan Ismail, Irwan Ismunandar Ismunandar Ismunandar Ivonne Telussa Joris, Shielda Natalia Jusuph J Wattimury Kabau, Widyawati Kapelle, Imanuel B. D. Kapressy, Blessing H Koto, Saifuddin Landu, Sartika Lesiela, Lewi Lessil, Camellia Y. Letsoin, Lina I Leuwol, Dean Y.E. Lina I Letsoin Maahury, Mirella Fonda Mangesa, Rosita Matheis F.J.D.P anasale Matheis F.J.D.P. Tanasale Modok, Deddy W.S. Muhamad A. Martoprawiro Muhamad Abdulkadir Martoprawiro Muhamad Abdulkadir Martoprawiro Naharuik, Sintia Nanlohy, Alberth Ch. Natsir, Nur Alim Netty A Siahaya Nina B Garium Nunumete, Neti Nurwidah, Andi Pattiasina, Priska M. Pelata, Paulina M. Pieter J Kunu Pusung, Yulian A. D. Ranglalin, Olivia M. Rosmawaty Harahap Rumakat, Dewi H Rumatoras, Hadijah Salatutin, Febrian M. Sanawain, Lea Sekewael, Serly J. Sekewael, Serly Jolanda Selanno, Debby A J Selanno, Debby A.J. Semuel Simra Pada Seumahu, Cecelia Anna Seumahu, Cecilia A. Seumahu, Cecillia Anna Siahaya, Antho Netty Siahaya, Netty A Siti Nuraisah, Siti Sohilait, Mario R. Sohilait, Mario Rowan Sri, Dewi Sunarti Taipabu, Muhammad I. Tanasale, Matheis Matheis Frits Jan David Pieter Tehubijuluw, Helna Tupan, Ch I Uktolseya, Lady Diana Wattimury, Jusuf Yeanchon Henry Dulanlebit