cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota samarinda,
Kalimantan timur
INDONESIA
PROSIDING SEMINAR KIMIA
Published by Universitas Mulawarman
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 513 Documents
 48   49   50   51   52 
MINI REVIEW: PEMANFAATAN ADSORBEN ARANG AKTIF CANGKANG TELUR TERHADAP LOGAM BERAT Sarah Nur Aulia Azzahra; Soerja Koesnapardi; Ika Yekti Liana Sari
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A mini review on the utilization of activated carbon adsorbent from eggshells for heavy metal removal has been conducted. From the study results, it is known that activated carbon made from eggshells contains chemical compounds such as calcium carbonate (CaCO₃) at 94%, magnesium carbonate (MgCO₃) at 1%, and calcium phosphate (Ca₃(PO₄)₂) at 4%. The process of making activated carbon from eggshells involves first physically activating the eggshell powder through heating, followed by chemical activation using various strong acids such as HCl. The material is then neutralized and dried at 100°C for 30 minutes. The resulting activated carbon is then brought into contact with heavy metals such as Lead (Pb), Cadmium (Cd), Copper (Cu), Zinc (Zn), and Iron (Fe). The results show that the adsorption percentage and adsorption capacity of the eggshell activated carbon range from 32.09% to 99.81% and 67.745%, respectively. These values are influenced by factors such as surface area, concentration, stirring speed, and the activation conditions of the adsorbent. Keywords: Activated Carbon, Adsorption, Heavy Metals
ANALISA KADAR AMONIA DAN UJI LOGAM BERAT (Fe dan Mn) PADA AIR LIMBAH DOMESTIK Tentriati Cahaya; Aman Sentosa Panggabean; Moh Syaiful Arif
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A study entitled Analysis of Ammonia Levels and Heavy Metals (Fe and Mn) in Domestic Wastewater has been conducted. This research aimed to determine the concentrations of ammonia and heavy metals (Fe and Mn) in domestic wastewater from the drainage channel on Jalan H. M. Ardans (AL 1) and the wastewater treatment plant of PT. LAB (AL 2). Ammonia levels were analyzed using the phenate spectrophotometric method, while heavy metal concentrations (Fe and Mn) were determined using the Atomic Absorption Spectrophotometry (AAS) method. Based on the analysis results, ammonia levels were found to be 0.45 mg/L in AL 1 and 0.08 mg/L in AL 2. The concentration of iron (Fe) was 3.17 mg/L in AL 1 and 0.50 mg/L in AL 2. The concentration of manganese (Mn) was 15.07 mg/L in AL 1 and 0.30 mg/L in AL 2. The ammonia levels in both AL 1 and AL 2 complied with the quality standard of 10 mg/L. The Fe concentrations in AL 1 and AL 2 also met the quality standard of 5 mg/L. The Mn level in AL 2 met the quality standard of 2 mg/L, whereas the Mn level in AL 1 exceeded the permissible limit. Keywords: ammonia, iron (Fe), domestic wastewater, manganese (Mn)
Front Matter SNKT 2025 Nanang Tri Widodo
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

AKTIVITAS ENZIM LIPASE PADA BERBAGAI KECAMBAH BIJI TUMBUHAN: A MINI REVIEW Mita Haryani; Djihan Ryn Pratiwi; Eva Marliana
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Lipase is an enzyme that functions as a catalyst in the hydrolysis reaction of triglycerides into glycerol and free fatty acids. Lipase has wide applications in various fields such as the food industry, cosmetics, biotechnology, and biocatalysis. This review examines the activity of lipase enzymes derived from various tropical plant sources based on previous research results using in vitro enzymatic assay methods. Lipase activity was detected in germinated seed samples of several plant species, including Jackfruit Seed Sprouts (Artocarpus integer), Avocado Seed Sprouts (Persea americana Mill), Cocoa Seeds (Theobroma cacao L.), Indian Almond Seed Sprouts (Terminalia catappa L.), Rambutan Seed Sprouts (Nephelium lappaceum L.), Durian Seed Sprouts (Durio zibethinus R.), Kesambi Seed Sprouts (Schleichera oleosa L.), Sunflower Seeds (Helianthus annuus L.), Jatropha Seed Sprouts (Jatropha curcas L.), and Palm Princess (Veitchia merrillii). The results showed varying lipase activity values ranging from 0.100 to 41.5 U/mL, reflecting differences in expression and physiological function. The highest lipase activity was found in Kesambi Seed Sprouts (Schleichera oleosa L.) with a value of 41.5 U/mL, while the lowest was found in Cocoa Seeds (Theobroma cacao L.) with a value of 0.010 U/mL. These findings indicate that Kesambi Seed Sprouts have strong potential to be further developed as a source of lipase enzymes for various industrial and biotechnological applications. Keyword: Plants, Enzymes, Lipase, lipase enzyme activity
MINI REVIEW: MENGKAJI POTENSI BAKTERI UNTUK PRODUKSI BIOETHANOL BERKELANJUTAN Muhammad Raihan Aswat; Rudi Kartika
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The need for renewable energy such as bioethanol is increasingly urgent to overcome dependence on fossil fuels and food security issues. The use of bacteria to ferment non-food lignocellulosic biomass is a strategic alternative due to its ability to process a variety of substrates, including pentose that cannot be metabolized by yeast. This article presents a systematic literature review of international journals (2015-2025) to evaluate the effectiveness of various bacteria in bioethanol production. The study methodology focused on comparing the types of microorganisms, raw materials, process methodologies, bioethanol yields produced. The results of the study highlight the great potential of specific bacteria. Zymomonas mobilis showed the highest efficiency, achieving 100% yield through a cell-free system due to its superior Entner-Doudoroff metabolic pathway. Other bacteria such as Escherichia coli (90%) and Bacillus subtilis (76.8%) demonstrated excellent raw material flexibility. Additionally, engineered Clostridium thermocellum (70%) stood out for its ability to perform Consolidated Bioprocessing at high temperatures. However, challenges were encountered with Enterobacter sp., which only produced 23.6% ethanol due to its natural metabolism, which tends toward mixed acid fermentation. It was concluded that the use of bacteria is highly effective for bioethanol production but its effectiveness is highly dependent on strain selection and process engineering. Keywords: Bioethanol, Bacteria, Zymomonas mobilis, Entner-Doudroff,
ANALYTICAL PERFORMANCE SPEKTROFOTOMETER UV-VIS DOUBLE BEAM DENGAN METODE KIT SPADNS (SODIUM 2-(PARASULFOPHENYLAZO)-1,8-DIHYDROXYNAPHTHALENE-3,6-DISULFONATE) PADA PENGUJIAN KADAR FLUORIDA (F-) AIR MINUM DALAM KEMASAN DI KALIMANTAN TIMUR Anissa Tsunami; Bohari Yusuf; Moh. Saiful Arif
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Fluoride is an important element in the human body that functions to maintain healthy teeth and bones. However, excessive fluoride levels can cause fluorosis, while low levels increase the risk of dental caries. This study aims to determine the fluoride ion content in various types of drinking water using the UV-Vis spectrophotometry method with the SPADNS reagent kit and to determine the limit of detection (LoD) and limit of quantification (LoQ) values. The research procedure included preparing standard solutions, calibration curves, optimizing reaction time and pH, and applying the method to bottled drinking water (AMDK), refill water, and PDAM water samples. The results showed a maximum wavelength of 570 nm, an optimum reaction time of 1 minute, and an optimum pH of 5.0–5.5. The LoD and LoQ values were 0.00923 mg/L and 0.0327 mg/L, respectively, indicating high sensitivity of the method. The fluoride content in AMDK 01 (Sijiro) was 0.11 mg/L, AMDK 02 (DC) was 0.12 mg/L, refill water was 0.59 mg/L, and PDAM water was 1.19 mg/L. All results were below the maximum limit of 1.5 mg/L (SNI 3553:2015; WHO), making them safe for consumption. The double-beam UV-Vis spectrophotometry method with SPADNS reagent proved to be sensitive, precise, and accurate for determining fluoride levels in drinking water. Keywords: Fluoride, KIT SPADNS, UV-Vis Spectrophotometry, Drinking Water
VALIDASI METODE WALKLEY-BLACK UNTUK PENETAPAN C-ORGANIK PADA SAMPEL TANAH MENGGUNAKAN SPEKTOFOTOMETRI UV-VIS Gladys Carmia Puspita; Subur P. Pasaribu; Aman Sentosa Panggabean
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The determination of organic carbon (C-organic) content in soil is an important indicator for evaluating soil fertility and environmental quality. This study aims to validate the Walkley–Black method using UV-Vis spectrophotometry for the determination of C-organic content in oil palm plantation soil. The analysis was carried out through the oxidation of organic matter using K₂Cr₂O₇ under acidic conditions, and the reduction of Cr⁶⁺ to Cr³⁺ ions was measured at a wavelength of 587 nm. The validation parameters evaluated included linearity, accuracy, precision, limit of detection (LOD), and limit of quantification (LOQ). The calibration curve produced a linear regression equation of y = 0.0016x + 0.0044 with an R² value of 0.9967, indicating excellent linearity. The accuracy test resulted in an average recovery of 98.09%, which falls within the AOAC acceptance range (80–115%), while the precision test yielded an RSD value of 1.50%, showing high repeatability. The calculated LOD and LOQ values were 1.3669 ppm and 3.3407 ppm, respectively, indicating good sensitivity. Based on these results, the Walkley–Black method using UV-Vis spectrophotometry meets analytical validation criteria and is reliable and efficient for determining organic carbon content in oil palm plantation soil. Keywords: Walkley–Black, C-organic, UV-Vis spectrophotometry, Method validation, Soil
EVALUASI PARAMETER LINGKUNGAN DALAM PELAKSANAAN KEGIATAN PENGASPALAN DI WILAYAH SAMARINDA Miswara Al-Wadji; Mochamad Gaharu Dida Devedo1; Ardhan Ismail
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Construction activities have the potential to affect environmental quality, particularly ambient air, noise, vibration, and surface water around project sites. This study aims to analyze the environmental quality of construction activities based on laboratory test results and compare them with the environmental quality standards stipulated in Government Regulation No. 22 of 2021. The research used a descriptive quantitative approach through the analysis of air parameters (NO₂, TSP, CO), noise level, vibration, and river water quality (DO). The laboratory results showed that all parameters were below the environmental quality limits, with NO₂ = 34 µg/Nm³, TSP = 76 µg/Nm³, CO = 206 ppm, noise = 64 dB(A), vibration = 0.2 mm/s, and DO = 6.31 mg/L. These findings indicate that the construction activities did not significantly impact the surrounding environmental conditions. Effective environmental management, controlled heavy equipment operations, and compliance with environmental regulations were key factors in maintaining environmental quality. Therefore, it can be concluded that the monitored construction project met the required environmental standards and remained within safe environmental conditions. Keywords: ambient air, construction wastewater, environmental quality, noise, vibration
PEMBUATAN DAN KARAKTERISASI MEMBRAN ELEKTRODA SELEKTIF ION CD(II) BERBASIS PVC DENGAN NA2S SEBAGAI IONOFOR Zahra Ourelya Nazzala; Aman Sentosa Panggabean; Noor Hindryawati
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Preparation and characterization of Cd2+ ion selective electrode membrane using sodium sulfide (Na2S) as an ionophore has been conducted. This research aims to create and characterize Cd2+ ion selective electrode membrane as a chemical sensors. Membrane of ion selective electrode was made with the optimum composition with ratio of Na2S : PVC : DOP was 6 : 3 : 1. The membrane was doped using 1 M Cd2+ solution for 7 days, and characterized using FT-IR spectroscopy. FT-IR characterization used to determine the shift of wave number from absorption spectrum, the results showed the absorption 851 cm-1 wave lenght is Cd–S bond. ion selective electrode Cd2+-Na2S characterization show that ion selective electrode worked well with an internal solution composition 1:3 with the linear concentration range 1×10-4 - 1×10-1 M, with Nernst factor was 29.87 mV/decade and the limit of detection was 5.71×10-5 M as a Cd(CH3COO)2 concentration or equivalent to Cd2+ concentration of 0.6422 ppm. Ion selective electrode worked optimally in the pH range 4-6, with the response time was 10-60 seconds and can be used up to 5 days. The presence of interfere ions such as Cu2+, Zn2+, Cl-, NO3-, and SO42- didn’t affect the performance of ion selective electrode Cd2+-Na2S determining Cd2+ ions in the samples. Keywords: Cd(II), Ion selective Electrodes, PVC membrane, Na2S.
SINTESIS BIODIESEL DENGAN METODE IMPREGNASI CaO-AlCl3 MENGGUNAKAN BAHAN BAKU MINYAK JELANTAH St Annisa Gani Rachim
PROSIDING SEMINAR KIMIA Vol 4 No 2 (2025): Prosiding SNKT 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The background is that in the biodiesel production process, the use of CaO catalyst can react with CO2 and H2O to form Ca(OH)2 in the air, causing its catalytic activity to become less effective. Therefore, modification of the CaO catalyst is needed by using the method of impregnating the CaO catalyst with AlCl3 catalyst.. Therefore, modifying the CaO catalyst with the AlCl3 catalyst using the impregnation method is necessary. This process can prevent deactivation, increase catalytic activity and surface area, and prevent soap formation during biodiesel production. This study aims to determine the presence of alkyl ester groups and the effectiveness and percentage of biodiesel in the resulting product. The research method begins with purifying used cooking oil, impregnating CaO with AlCl₃, and synthesizing biodiesel through transesterification using the oil as the raw material. The reaction was performed at 70 °C with a 3% catalyst concentration by weight of the oil. The products were identified using Fourier transform infrared spectroscopy (FTIR). The results showed the presence of ester groups with a biodiesel conversion value of 87.84%. The study concluded that biodiesel produced using the impregnated catalyst method is effective because the obtained value is close to the ASTM D6751 standard. Keywords: Biodiesel, impregnation, CaO-AlCl3 catalyst, transesterification, waste cooking oil

Page 51 of 52 | Total Record : 513

 48   49   50   51   52 

Filter by Year

2013 2025


Reset
Filter By Issues
All Issue Vol 4 No 2 (2025): Prosiding SNKT 2025 Vol 4 No 1 (2025): Prosiding SNK 2025 Vol 3 No 2 (2025): Prosiding SNKT 2024 Vol 3 No 1 (2024): Prosiding SNK 2024 Vol 2 No 2 (2024): Prosiding SNKT III 2023 Vol 2 No 1 (2023): Prosiding SNK 2023 Vol 1 No 2 (2023): Prosiding SNKT II 2022 Vol 1 No 1 (2022): Prosiding SNK 2022 2021: SEMINAR NASIONAL KIMIA 2021 Prosiding SNKT Himpunan Mahasiswa Kimia FMIPA UNMUL 2021 2020: Prosiding Seminar Nasional Kimia Berwawasan Lingkungan (SNK-BL) 2020 Seminar Nasional Himpunan Mahasiswa Kimia 2020 SEMINAR NASIONAL KIMIA 2019 SEMINAR NASIONAL KIMIA 2018 SEMINAR NASIONAL KIMIA 2017 PROCEEDING OF INTERNATIONAL CONFERENCE 2015 SEMINAR NASIONAL KIMIA 2014 SEMINAR NASIONAL KIMIA 2013 More Issue