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All Journal Jurnal Sains Dasar Jurnal Harpodon Borneo PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman Molecular and Cellular Biomedical Sciences (MCBS) Indonesian Journal of Chemistry JURNAL ATOMIK
Bohari Yusuf
Jurusan Kimia Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Education Energy Environmental Science Immunology & microbiology Medicine & Pharmacology Neuroscience

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Journal : PROSIDING SEMINAR KIMIA

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KAJIAN KUALITAS UDARA KOTA SAMARINDA DITINJAU DARI ASPEK AKTIVITAS KENDARAAN BERMOTOR Bohari Yusuf
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2014
Publisher : PROSIDING SEMINAR KIMIA

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Declining air quality and increasing number of vehicles at Samarinda City indicating that there is strong relationship between both. Research was done to understand current air pollution level in Samarida as ISPU Criteria and relationship air pollutant level with number of vehicles activities. Research was done by counting number of vehicles and collecting air samples at five crowded traffic intersection. Air samples tested in laboratory for ISPU specified air pollutant level, which are CO, NO2, SO2, O3 and dust (PM 10). Analysis of correlation was conducted to understand relationship between numbers of vehiclesand air pollutant level. Average level of air pollutant and their ISPU value were CO 2803ug/m3 (28.03; Good), NO2 47.9ug/m3 (-; Good), SO2 53.0ug/m3 (33.12; Good), O3 31.3ug/m3 (13.04; Good) and Dust 36.1ug/m3 (36.1; Good). There was positive correlation between numbers of vehicles and air pollutant level with coefficient >0.9. Therefore, limit numbers of vehicles before limit air pollutant level passed could be predicted. Prediction of limit numbers of vehicles based on CO level were 31217 units, NO2 level were 54186 units, SO2 level were127692 units, O3 level were 48672 units and dust level were 26371 units. Levels of CO, NO2, SO2, O3 and dust (PM 10) at Samarinda City still comply PP No. 41 year 1999 with Good as ISPU criteria average. Increase in number of vehicle will increase air pollutant levels too.Keywords: Air, Level, Pollutant, ISPU, Quality
SINTESIS NANOPARTIKEL PERAK TERMODIFIKASI KITOSAN SEBAGAI METODE ANALISIS: REVIEW ARTIKEL Zaki, Faisal; Yusuf, Bohari; Arif, Syaiful
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Silver nanoparticles themselves have been very much developed both through the method of synthesizing silver nanoparticles both physically, chemically and biologically. In the chemical method we can do by reducing Ag+ ions into silver nanoparticles which have an attachment to the reductant and also have a very strong ability to reduce Ag+ ions to become silver nanoparticles have a small size. Based on the literature review used, the reductor is Sodium Borohydrate (NaBH4). Chitosan acts as a capping agent which functions as a stabilizer in the silver nanoparticles. Silver nanoparticles modified using chitosan from previous research, namely for activity tests as antioxidants, as metal sensors and as antibacterials Where there is a change in color on silver nanoparticles from clear to yellow. Keywords: Silver Nanoparticles, Chitosan, Reducing Agent, Stabilizer, Chemical Sensor
KAJIAN LITERATUR PEMANFAATAN ADSORBEN ARANG AKTIF LIMBAH ORGANIK TERMODIFIKASI SURFAKTAN (SLS/SDS) TERHADAP ION LOGAM BERAT Terra, Patrycia Zulliani; Yusuf, Bohari; Lianasari, Ika Yekti
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A literature review of the use of surfactant-modified organic waste activated charcoal adsorbents (SLS/SDS) on the percent absorption and adsorption capacity of heavy metal ions has been carried out. The surfactants used are sodium lauryl sulfhate (SLS) and sodium dodecyl sulfhate (SDS). The organic waste activated charcoal used includes rice husks, teak wood sawdust, bamboo, salak fruit skin and coconut shells. From this study, it was found that activated charcoal predominantly contains cellulose and its derivatives which can be a carbon source. Modification with surfactants (SLS/SDS) aims to increase the adsorption capacity, absorption percentage and also the surface area of the adsorbent. The modification process is by mixing surfactant and activated charcoal with a certain weight and then homogenizing. The mixture was then neutralized with distilled water. Next, it is placed in the oven at a certain temperature, then crushed and sieved with a 100 mesh size. Next, the activated charcoal-surfactant adsorbent is contacted with heavy metal ions such as Pb2+, Cr3+, Cr6+, and Ni2+. The absorption results obtained ranged from 93.50 – 99.89%, with an adsorption capacity of 0.144 – 81.300 mg/g. The size of the percent absorption value and adsorption capacity is influenced by the surface area, activator substance, contact time, pH, and also the concentration of the adsorbate. Keywords: Activated Charcoal, Heavy Metal Ions, SLS, SDS, Modification
MINI REVIEW: PENERAPAN BERBAGAI IONOFOR DALAM PEMBUATAN ELEKTRODA SELEKTIF ION (ESI) Pb2+ SECARA POTENSIOMETRI Padang, Dea Angelina Tiku; Yusuf, Bohari; Arif, Moh Syaiful
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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This mini review provides a brief overview of the application of various types of ionophores in the fabrication of ion-selective electrodes (ISE) for detecting Pb2+ ions using the potentiometric method. Ionophores are key components in ISEs that determine the selectivity and sensitivity of the electrode toward the target ion. The purpose of this review is to provide insights into selecting effective ionophores for potentiometric applications in detecting Pb2+ contamination in the environment. The method used in this review involves screening articles on google scholar, research gate, and garuda published between 2015 and 2022. In this review, five types of ionophores were identified as active membrane materials for the fabrication of Pb2+ ISEs, including chitosan; 1,10-dibenzyl-1,10-diaza-18-crown-6 with anionic site KTCPB; dithizone; 1,10-diaza-18-crown-6 with anionic site KTCPB; and pt-butylcalix[4]arena with anionic site KTCPB. These ionophores were found to have Nernst values of 29.1, 29.64, 29.5, 27.61, 26.15, and 27.61 mV/decade, respectively. Dithizone was identified as the most effective ionophore for detecting Pb2+ due to its Nernst value being closest to the theoretical Nernst value of 29.57 mV/decade. Keywords: Ion-Selective Electrode (ISEs), ionophores, potentiometry, Pb2+ ions, Nernst factor
REVIEW ARTIKEL: ANALISIS pH, KONDUKTIVITAS, DAN OKSIGEN TERLARUT PADA AIR SERTA KADAR LOGAM BESI MENGGUNAKAN SPEKTROFOTOMETRI UV-VIS Putri, Marlisa Roro; Yusuf, Bohari; Lianasari, Ika Yekti
PROSIDING SEMINAR KIMIA Vol 3 No 2 (2025): Prosiding SNKT 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A literature review on the analysis of conductivity, ph and Dissolved Oxygen parameters and the application of uv-vis spectrophotometry in measuring iron metal levels in water was conducted. This literature review reviewed several studies related to water quality analysis with several parameters and measurement of total iron levels. Commonly used parameters include pH, conductivity, Dissolved Oxygen (DO), and iron metal levels. Measurements are made with tools such as pH meters, conductivity meters, DO meters, and UV-Vis spectrophotometry for iron metal levels. The use of UV-Vis spectrophotometry as a detection method was chosen due to its accuracy in quantitative analysis and its ability to identify dissolved metal species non-destructively. The results showed significant variations in these parameters at various locations. Some of these parameters did not meet the recommended water quality standards. The iron metal concentration data obtained showed variations in values depending on the type of complexant used in each sample. The main factors of concern are heavy metal contamination, especially iron, as well as low Dissolved Oxygen levels. The importance of regular water quality monitoring and better management is emphasized to maintain environmental balance and public health. Keywords : Water quality, Dissolved oxygen, Conductivity, pH, Iron.
REVIEW ARTIKEL : ANALISIS KADAR SULFAT, pH, DAN OKSIGEN TERLARUT (DO) SERTA KONDUKTIVITAS SEBAGAI PARAMETER KUALITAS AIR MINUM Andriana, Nita; Yusuf, Bohari; Arif, Moh.Syaiful
PROSIDING SEMINAR KIMIA Vol 3 No 2 (2025): Prosiding SNKT 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Drinking water quality is critical to public health. This article reviews studies that evaluated sulfate, pH, conductivity, and dissolved oxygen (DO) levels as key parameters in determining drinking water quality. Various water sources, such as tap water, wells, and bottled water, were analyzed in several studies. Sulfate was measured using the spectrophotometric method with BaCl2 reagent and absorbance was measured at a wavelength of 420 nm, while pH used a digital pH meter, conductivity was measured with a conductometer, and DO was measured with the Winkler method. The results showed significant variations in sulfate and dissolved oxygen levels between water sources. Some samples had pH that was below the standard, while sulfate levels in some samples were close to the maximum limit allowed by Permenkes No.492/MENKES/PER/IV/2010 (250 mg/L) and Permenkes No. 32/2017 (400 mg/L). DO proved to be the most sensitive parameter in detecting changes in water quality, followed by pH, and conductivity plays an important role in assessing drinking water quality as it provides an early indication of the concentration of dissolved ions that could indicate contamination, while sulfate is more effective in detecting certain contamination. The combination of these four parameters is important to ensure safe drinking water. This article is expected to guide research and assist water providers in maintaining drinking water quality standards. Keywords : Conduktivity, Drinking Water Quality, Dissolved Oxygen (DO), pH , Sulfate
Co-Authors Adhi Surya Pranata Surya Pranata Adhi Surya Pranata Surya Pranata, Adhi Surya Pranata Surya Agustin Pratiwi, Agustin Alimuddin - Alimuddin - Aman S Panggabean Aman S Panggabean, Aman S Aman Sentosa Panggabean Andriana, Nita Anton Rahmadi Arif, Moh Syaiful Arif, Moh. Syaiful Arif, Moh.Syaiful Arifin Syam Surya Arsyik Ibrahim Astria, Linda Yuniar Chairul Saleh Desy Ridho Rahayu Erwin Erwin Fenny Dian Lestari Finqo Aprianto Firzan Nainu Hamsina Hamsina Herman Herman Indri Ayu Lestari Indri Ayu Lestari, Indri Ayu Islamudin Ahmad Khasanah, Manja’a Laode Rijai Lianasari, Ika Yekti Linda Ajang Linda Ajang, Linda Marlinawati - Mirhansyah Ardana Miu, Agustinus Mutia Wulandari Nanang Tri Widodo Nisa, Hairin Nuranda, Apri Padang, Dea Angelina Tiku Putri, Marlisa Roro Putri, Raisya Karina RAHMAT GUNAWAN Rahmat GUnawan Rahmat Gunawan Rani Novia Ulya Ritson Purba Ritson Purba, Ritson Rochman, Mayasari Azhari Rudi Kartika, Rudi Sahriani, Andi Saibun Sitorus Sari, Ros Mita Selvi Jumiatul Astati Septiana, Rientha Siti Nurliana Siti Nurliana, Siti Syaiful Arif Tangke Veronika Tanjung, Albayssag Faisal Terra, Patrycia Zulliani Tri Paus Hasiholan Hutapea, Tri Paus Hasiholan Youlanda, Desy Zaki, Faisal