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All Journal Jurnal Teknologi Mineral dan Batubara Warta AKAB Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) JPM-AKA Jurnal Teknologi Mineral dan Batubara
Tirta, Ardina Purnama
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology Social Sciences

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VALIDITAS HASIL PENGUJIAN KADAR TIMBAL SECARA KOMPLEKSOMETRI TERHADAP MODIFIKASI TEKNIK PREPARASI DALAM PRODUK KONSENTRAT TIMBAL SULFIDA Aprillianto, Yesaya; Hardian, Arie; Herawati; Tirta, Ardina Purnama
Jurnal Teknologi Mineral dan Batubara Vol 19 No 3 (2023): Jurnal Teknologi Mineral dan Batubara Edisi September 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No3.2023.1507

Abstract

Lead sulfide (PbS) concentrate is derived from the sulfide mineral galena. In nature, galena must first undergo a concentration process to become PbS concentrate. The determination of lead (Pb) content in the PbS concentrate is carried out using complexometric methods, referring to the modified ISO 13545:2000 standard during the preparation stage. In this research, the validity of the test results was assessed using several parameters, including precision test (repeatability and reproducibility), accuracy (%recovery) and estimation of measurement uncertainty. Certified reference material (CRM) Pb353, with a Pb content range of 58.20-64.33% was used as a sample in this study. The results showed an average Pb content of 61.11% for analyst A and 61.00% for analyst B in CRM Pb353. The research successfully met the precision testing requirements for repeatability (RSD 0.46% for analyst A and 0.39% for analyst B < 2/3 coefficient variance (CV) Horwitz 1.44%) and reproducibility (F-test 1.34 < F-table 4,28 and P-value 0.37 > significance level 0.05). Accuracy was also demonstrated with %recovery (analyst A 9.06–100.53% and analyst B 99.23–99.98%), as well as the estimation of measurement uncertainty (μrelative 2.27% < 5%). Therefore, the determination of Pb content using complexometric methods with modified preparation techniques in the PbS concentrate ensures the validity of the results.
Penapisan Senyawa Kandidat Obat Covid-19 dari Ekstrak Asparagus dengan Mekanisme Inhibisi Spike Protein Varian B.1.1.7 terhadap Ligan Panglipur, Hanum Sekar; Fachrurrazie, Fachrurrazie; Wulanawati, Armi; Untung, Joko; Cahyotomo, Anom; Tirta, Ardina Purnama; Solihat, Imas; Amalia, Annissa
Journal Warta AKAB Vol 47, No 2 (2023): Warta AKAB
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55075/wa.v47i2.164

Abstract

Penyebaran yang cepat dan terus meluas semenjak ditemukannya virus Severe Acute Respiratory Syndrome Coronavirus 2 atau SARS-CoV-2 pada 2019, telah memberikan dampak yang luas pada aspek kesehatan dan kesejahteraan global, khususnya Indonesia. Pencarian terapi standar melalui jalur paru seperti nebulizer, menggunakan ekstrak Asparagus diharapkan mampu menjadi alternatif dan terobosan bagi pengobatan SARS-CoV-2. Pengobatan ini merujuk pada proses penapisan antara Spike Glikoprotein (SGP) virus SARS-CoV-2 varian B.1.1.7 dengan reseptor sel manusia ACE2. Penapisan dilakukan dengan mereaksikan senyawa-senyawa yang terdapat pada ekstrak Asparagus dengan SGP virus SARS-CoV-2, sehingga infeksi dapat dicegah. Asparagus dipilih karena mengandung banyak senyawa fitokimia yang diharapkan dapat memberikan karakteristik antivirus, dan dapat menjadi acuan pengobatan COVID-19 melalui studi in silico. Didapat bahwa Dioscin merupakan senyawa yang paling kuat berinteraksi dengan SGP virus SARS-CoV-2 varian B.1.1.7 dari 67 senyawa pada ekstrak Asparagus yang dipelajari. Selain Dioscin terdapat 3 senyawa lainnya yang dapat menjadi acuan untuk pengobatan COVID-19, yakni Shatavarin IV, Aspafilioside A, dan Solasonin dengan nilai afinitas masing-masing -8.3, -8.1, -7.9, dan -7.9 kkal/mol.
Sistem Monitoring Suhu dan Kelembapan pada Budidaya Jamur Tiram Berbasis Internet of Things di IKM Usaha Mandiri Sulistiawaty, Lilis; Tirta, Ardina Purnama; Solihat, Imas; Mulyawan, Reza; Untung, Joko; Madiabu, Mohammad Jihad
Jurnal Pengabdian Masyarakat AKA Vol 5, No 1 (2025): Vol 5, No 1 (2025): Juni 2025
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55075/jpm-aka.v5i1.276

Abstract

Internet of Things (IoT) adalah sistem terintegrasi yang menghubungkan mikrokontroler, sensor, dan aktuator untuk memperoleh serta mengirimkan data secara real-time melalui jaringan internet. Salah satu penerapannya di bidang pertanian adalah pemantauan suhu dan kelembapan pada budidaya jamur tiram. Budidaya ini tidak memerlukan paparan cahaya matahari secara langsung, sehingga dilakukan di ruang tertutup dengan suhu ideal 25–30 °C dan kelembapan 80–90%. Tingkat keasaman (pH) optimal berkisar antara 6–7, serta cocok dikembangkan di dataran tinggi pada ketinggian 700–800 mdpl. Namun, pelaku usaha di IKM Bina Usaha Mandiri masih menghadapi tantangan dalam memantau kondisi lingkungan budidaya secara konsisten, yang menyebabkan penurunan hasil produksi. Kegiatan Pengabdian kepada Masyarakat (PKM) dilaksanakan dengan memberikan pelatihan penggunaan alat pemantau suhu dan kelembapan berbasis IoT yang mampu memberikan notifikasi ketika parameter lingkungan tidak sesuai. Dengan adanya teknologi ini, pelaku usaha dapat memonitor kondisi budidaya secara jarak jauh dan mengambil tindakan preventif. Pelatihan berjalan lancar dan mendapat respons positif dari pemilik IKM. Penerapan sistem ini diharapkan meningkatkan kualitas hasil panen jamur tiram dan memenuhi permintaan pasar secara lebih optimal.
Development and Characterization of Gold Nanoparticle-Modified SPCEs for the Electrochemical Sensing Diksy, Yuris; Tirta, Ardina Purnama; Herawati; Mulyawan, Reza; Hayat, Moh; Asrorudin, Udin
Indonesian Journal of Chemical Studies Vol. 4 No. 2 (2025): Indones. J. Chem. Stud. December 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i2.71

Abstract

Gold nanoparticles were successfully synthesized by reducing HAuCl4 using jengkol (Archidendron pauciflorum) extract as a reductant. The synthesized gold nanoparticles were characterized by UV–vis spectroscopy and particle size analyzer (PSA). The synthesized gold nanoparticles were deposited on the screen printed carbon electrode (SPCE) substrate using 2 methods, drop casting and differential pulse voltammetry over a potential range of (-1500) mV to 600 mV, scan rate of 100 mV/s for 5 cycles. The surface plasmon resonance (SPR) band of UV– Vis spectrum at 530.7 nm confirmed the presence of gold nanoparticles. The results of Au nanoparticle characterization using PSA show that the size of the Au-NPs formed is 33.5 nm with an optimal HAuCl4 concentration of 0.20 mM. Characterization of gold nano-deposited SPCE was carried out by measuring the peak current of the 1 mM K3Fe(CN)6/K4Fe(CN)6 system in KCl electrolyte solution (0.1 M) using cyclic voltammetry over a potential range of (-500) mV to 1000 mV, scan rate 100 mV/s for 5 cycles. Gold nanoparticles deposited by differential pulse voltammetry showed a higher current response compared to drop casting deposition.
VALIDITAS HASIL PENGUJIAN KADAR TIMBAL SECARA KOMPLEKSOMETRI TERHADAP MODIFIKASI TEKNIK PREPARASI DALAM PRODUK KONSENTRAT TIMBAL SULFIDA Aprillianto, Yesaya; Hardian, Arie; Herawati; Tirta, Ardina Purnama
Jurnal Teknologi Mineral dan Batubara Vol 19 No 3 (2023): Jurnal Teknologi Mineral dan Batubara Edisi September 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No3.2023.1507

Abstract

Lead sulfide (PbS) concentrate is derived from the sulfide mineral galena. In nature, galena must first undergo a concentration process to become PbS concentrate. The determination of lead (Pb) content in the PbS concentrate is carried out using complexometric methods, referring to the modified ISO 13545:2000 standard during the preparation stage. In this research, the validity of the test results was assessed using several parameters, including precision test (repeatability and reproducibility), accuracy (%recovery) and estimation of measurement uncertainty. Certified reference material (CRM) Pb353, with a Pb content range of 58.20-64.33% was used as a sample in this study. The results showed an average Pb content of 61.11% for analyst A and 61.00% for analyst B in CRM Pb353. The research successfully met the precision testing requirements for repeatability (RSD 0.46% for analyst A and 0.39% for analyst B < 2/3 coefficient variance (CV) Horwitz 1.44%) and reproducibility (F-test 1.34 < F-table 4,28 and P-value 0.37 > significance level 0.05). Accuracy was also demonstrated with %recovery (analyst A 9.06–100.53% and analyst B 99.23–99.98%), as well as the estimation of measurement uncertainty (μrelative 2.27% < 5%). Therefore, the determination of Pb content using complexometric methods with modified preparation techniques in the PbS concentrate ensures the validity of the results.
Co-Authors Amalia, Annissa Aprillianto, Yesaya Arie Hardian Armi Wulanawati Asrorudin, Udin Cahyotomo, Anom Diksy, Yuris Fachrurrazie, Fachrurrazie Hayat, Moh Herawati Lilis Sulistiawaty Madiabu, Mohammad Jihad Mulyawan, Reza Panglipur, Hanum Sekar Solihat, Imas Untung, Joko