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 502 Documents
 47   48   49   50   51 
ANALISA KADAR FOSFAT DAN NITRIT PADA SAMPEL AIR DANAU DENGAN MENGGUNAKAN METODE SPEKTROFOTOMETRI Marlisa Roro Putri; Bohari Yusuf; Ika Yekti Lianasari
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

Lake water plays an important role as a water resource and as a habitat for aquatic ecosystems. However, increasing human activities around the lake have led to pollution, particularly by phosphate and nitrite compounds originating from domestic and industrial waste. This study aims to determine the levels of phosphate and nitrite in lake water samples from the southern (AP1) and western (AP2) parts of the Polder using the UV-Vis spectrophotometry method. Phosphate analysis was conducted based on SNI 6989.31:2005, and nitrite analysis was based on SNI 06-6989.9-2004 using a UV-Vis spectrophotometer. The results showed that phosphate levels in samples AP1 and AP2 were 0.053 mg/L and 0.046 mg/L, respectively, while nitrite levels at both points were 0.055 mg/L. These parameters are still below the quality standard thresholds set by Government Regulation No. 22 of 2021. These findings indicate that the water quality of the Polder lake still meets the established environmental standards. Therefore, the UV-Vis spectrophotometry method is effective for water quality monitoring, and the results of this study can serve as a basis for sustainable aquatic environmental conservation efforts. Keywords: Lake, Phosphate, Nitrite and UV-Vis Spectrophotometer.
SKRINING FITOKIMIA DAN UJI TOKSISISTAS EKSTRAK ETANOL DAUN SUTRA PERSIA (Albizia julibrissin) Mohammad Alvian Noor Arya; Renety Oktaviani; Nurul Aisyah; Madya Saputri; Imel Utami Pairunan; Yonathan Desmellson Situmorang; Erwin
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

Persian silk (Albizia julibrissin) is a medicinal plant known to contain active compounds such as alkaloids, phenolics, flavonoids and quinones which have the potential as antioxidants and natural toxic compounds. Phytochemical screening showed the presence of these compounds in the leaf extract. In addition, a toxicity test using the Brine Shrimp Lethality Test (BSLT) method on Artemia salina larvae showed that the extract had an LC₅₀ value of 0.000007 ppm, which is included in the very toxic category. These results indicate that Persian silk leaves (Albizia julibrissin) have the potential to be developed as natural bioactive agents. Keywords: Sutra Persia, Phytochemical Screening, Brine Shrimp Lethality Test (BSLT)
PENYERAPAN LOGAM Pb2+ SECARA BIOLOGIS OLEH BAKTERI Escherichia coli Muhammad Sigit Ariski; Rudi Kartika; Rahmat Gunawan
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

The biological absorption of Pb2+ metal by Escherichia coli bacteria has been conducted. This study aims to determine the ability of Escherichia coli bacteria to absorb Pb2+ metal based on variations in Pb2+ exposure concentrations (0, 3, 6, 9, 12, 15 ppm) over different exposure times (days) and to identify the optimal concentration and time required for Escherichia coli in the biological absorption of Pb2+ metal. The maximum wavelength of the standard Pb2+ solution is 520 nm. Based on the test results, Escherichia coli was able to absorb Pb2+ at varying exposure concentrations (3, 6, 9, 12, 15 ppm) with biosorption percentages of 49.118%, 23.985%, 14.500%, 10.150%, and 7.808%, respectively. The optimal concentration and time required for Escherichia coli to absorb Pb2+ occurred on the 3rd day with a Pb2+ exposure concentration of 3 ppm. Keywords: Biosorption, Pb2+ metal, Escherichia coli
BIOSORPSI LOGAM OLEH BAKTERI Muhammad Harry Rahmadan; Rudi Kartika; Rahmat Gunawan
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

The growth of industry in Indonesia, especially in the textile sector, has led to an increase in the production of liquid waste containing heavy metals such as chromium (Cr), lead (Pb), and copper (Cu). These metals can pose significant health risks if they enter the body of living things. To overcome this, one alternative method of reducing liquid waste is to utilize biosorption by bacteria. This study aims to determine the ability of metal absorption by several bacteria, namely Streptococcus mutans, Flavobacterium sp, Pseudomonas sp, and Bacillus subtilis. The results showed that Streptococcus mutans was able to absorb Cr (VI) with a maximum efficiency of 90.80% at a concentration of 5 ppm on the 5th day. While Flavobacterium sp was able to absorb Pb at a maximum of 96% at a concentration of 2 ppm on the 18th day. Pseudomonassp showed maximum uptake of 96.192% for Cr(VI) at 5 ppm on day 14, 36.874% for Pb at 4 ppm on day 16, and 84.447% for Cu(II) at 3 ppm on day 16. Bacillussubtilis showed maximum uptake of 97.42% for Pb at 10 ppm. These findings indicate that bacteria have significant potential for heavy metal biosorption in wastewater treatment. Keywords: Absorption,Metal,Bacteria
PIROLISIS LAMBAT OFF-GRADE RUBBER DENGAN REAKTOR PIROLISIS SEMI-KONTINYU PADA SUHU 200 oC Mutiara Pertiwi; RR Dirgarini Julia Nurlianti Subagyono; Ari Susandy Sanjaya; Mohd. Asyraf Kassim
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

Off-grade Rubber is a by-product from rubber industries that has potential as a renewable energy raw material. This study aims to determine the results of slow pyrolysis of off-grade rubber at a temperature of 200 oC using a laboratory-scale semi-continuous pyrolysis reactor for 30 minutes. The off-grade rubber had a moisture content of 23.62 ± 2.26% and an ash content of 11.24 ± 1.09%. The bio-oil yield and the aqueous phase yield at 200 oC were 0.27% and 2.1%, respectively. Chemical compound analysis using Gas Chromatography-Mass Spectrometry (GC-MS) showed five dominant compounds, namely glyceroltriethylether, 3,3-dimethyl-1-oxa-3-silacycloheptanone-7, 1-methylethyl heptanoate, 1-methyl-1-ethoxy-1-silacyclopentane, and heptanoic acid, 1-methylethyl ester. Keywords: Bio-oil, off-grade Rubber, Slow Pyrolysis
PIROLISIS LAMBAT SPIRULINA PLATENSIS PADA SUHU 400˚C Nela Gamboa Rodriques; R.R Dirgarini Julia Nurlianti Subagyono; Abdul Aziz
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

This study aims to investigate the slow pyrolysis of Spirulina platensis using a laboratory-scale reactor. The slow pyrolysis was conducted at 400°C for 60 minutes. The results showed that the bio-oil yield obtained was 9%. Gas Chromatography-Mass Spectrometry (GC-MS) analysis revealed that the dominant compounds in the bio-oil were hexadecanoic acid, N-Tetradecanoic Acid Amide, 1H-Indole and Phenol,4-Methyl, which are degradation products of lipids and proteins. Keywords: Spirulina platensis, slow pyrolysis, bio-oil, temperature, chemical composition
UJI FITOKIMIA DAN TOKSISITAS EKSTRAK ETANOL DAUN KAJAJAHI (Leucosyke capitellata (poir) Wedd.) Nur Laila Zulfah Sari; Arif Nur Sho’im; Amanda Salwa Nur Azizah; Habel Ta’dung; Siti Nur Hadijah; Erwin
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

Kajajahi Leaves (Leucosyke Capitellata (poir) Wedd.) or also called Kandih Uso which has benefits such as slowing attachment, aggregation and platelet secretion. Therefore, this study was carried out aimed at finding out the secondary metabolites of the Kajajahi leaf knowing and the toxicity of the Kajajahi leaf ethanol extract using the Brine Shrimp Lethality Test (BSLT) method. This extract is made by maceration using ethanol solvents for 7 days. Phytochemical tests are carried out to determine the secondary metabolites contained. Phytochemical content includes flavanoid, steroid, phenolic, saponin and quinone. The toxicity test was carried out using Artemia Salina L. shrimp larvae which was 48 hours old. The results of the extract toxicity are identified by the persentation of the death of the shrimp larvae using the LC50. This study shows the metabolites of secondary metabolites Ethanol extract Kajajahi leaf including flavanoid, steroid, phenolic, saponin and quinons and to be toxic with LC50 values of 0.0000166 ppm. Keywords: Brine Shrimp Lethality Test (BSLT), Kajajahi Leaves, Leucosyke Capitellata, Phytochemical Test, Toxicity
MINI-REVIEW: APLIKASI SPEKTROFOTOMETRI UV-VIS PADA PENETAPAN PENGARUH MATRIKS TERHADAP PB DENGAN PENGOMPLEKS ALIZARIN SULFONAT Nurhafida; Bohari Yusuf; Alimuddin
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

Heavy metal contamination, particularly lead (Pb), is a serious environmental issue due to its toxic nature and ability to accumulate in the food chain. Common analytical methods such as AAS and ICP-OES offer high accuracy but require expensive instruments and complex procedures. As a simpler and more economical alternative, UV-Visible spectrophotometry utilizes the formation of coordination complexes between Pb²⁺ ions and complexing reagents such as alizarin sulfonate. This mini review discusses the interaction between Pb and alizarin sulfonate, the working principle of UV-Vis spectrophotometry, and the influence of sample matrices on complex stability. The review indicates that this method provides valid, rapid, and efficient results, and can be effectively applied to environmental samples with complex matrices, provided appropriate sample preparation and method validation are conducted. Keywords: Lead (Pb), UV-Vis Spectrophotometry, Alizarin Sulfonate, Complex Formation
REVIEW ARTIKEL: AKTIVITAS ANTIBAKTERI SENYAWA METABOLIT SEKUNDER PADA BEBERAPA EKSTRAK TANAMAN TERHADAP BAKTERI Escherichia coli Ripaldy Apriansya; Rudi Kartika; Shaparuddin Nur Arifullah; Dilo Jhosea Luciano Eduardo; Muhammad Raihan Aswat; Muhammad Adhitya Rizkirullah
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

Indonesia's current biodiversity makes it something valuable for the community. Especially the use of plants that are used as medicinal materials. This is supported by the content of secondary metabolite compounds found in plants such as flavonoids, phenolics, steroids, saponins, tannins and others. These compounds have antibacterial activity that can be used to inhibit the growth of microbes that harm humans. By conducting a literature study of 10 national and international articles in the last 10 years of publication to review the ability of several plants that have potential as antibacterials. Tests were carried out on Escherichia coli bacteria which included the extract solvent used, the content of metabolite compounds in the extract and its activity based on the inhibition zone diameter value and/or minimum inhibitory concentration (MIC). Keywords: Antibacterial, inhibition zone diameter, Escherichia coli, minimum inhibitory concentration, secondary metabolites
MINI REVIEW: PERBANDINGAN KINERJA ELEKTRODA SELEKTIF ION Cu2+ DENGAN BERBAGAI IONOFOR DALAM MATRIKS PVC-DOP Safira Qisthina Wardhana; Alimuddin; 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

Copper (Cu) contamination resulting from industrial waste can have detrimental effects on both the environment and human health. To control Cu pollution, a rapid and accurate detection method is required. This study compares the performance of Cu²⁺ ion-selective electrodes using various ionophores in a polyvinyl chloride (PVC) matrix plasticized with dioctyl phthalate (DOP). The ionophores compared include EDTA, Rhodamine 6G, and Schiff base. The evaluated parameters include Nernstian slope, detection limit, linear range, response time, and selectivity. The results indicate that Rhodamine 6G and Schiff base exhibit superior sensitivity and response time, while EDTA provides better long-term stability. Keywords: Ion Selective Electrode, Cu2+ metal, Ionophore

Page 50 of 51 | Total Record : 502

 47   48   49   50   51 

Filter by Year

2013 2025


Reset
Filter By Issues
All Issue 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