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All Journal VALENSI CHEMISTRY PROGRESS PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman Science and Technology Indonesia Indonesian Journal of Chemistry Jurnal Riset Teknologi Industri JURNAL KIMIA SAINTEK DAN PENDIDIKAN Molekul: Jurnal Ilmiah Kimia Journal of Innovative and Creativity Jurnal Sains dan Kesehatan
Subur P Pasaribu
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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PERBANDINGAN PENENTUAN KADAR PROKSIMAT DALAM BATUBARA MENGGUNAKAN METODE GRAVIMETRI KONVENSIONAL DAN THERMOGRAVIMETRIC ANALYSIS Muhammad Robiansyah; Subur P. Pasaribu; Aman Sentosa Panggabean
JURNAL KIMIA SAINTEK DAN PENDIDIKAN Vol 5 No 2 (2021): JURNAL KIMIA SAINTEK DAN PENDIDIKAN
Publisher : Program Studi Kimia - Universitas Sari Mutiara Indonesia

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Abstract

Research on the comparison of the determination of proximate levels in coal using conventional gravimetric methods and Thermogravimetric Analysis (TGA) through comparative tests has been carried out. This study aims to determine the comparison of the average analysis results using the t-test, the precision level of analysis results of each method using CV Horwitz, and the comparison of the precision level of the analysis results using the F test. Based on the results of the t-test showed a significant difference in the average analysis results between the two methods for all parameters. In the test using CV Horwitz for parameters of inherent moisture, volatile matter and fixed carbon using both methods and also ash content using the conventional gravimetric method was declared to meet the precision requirements, but for the ash content parameter using TGA instruments was stated otherwise. The F test for parameters of ash content and inherent moisture showed a significant difference in the precision level of the analysis results between the two methods, but for the parameters of volatile matter and fixed carbon was stated otherwise.
PERBANDINGAN PENENTUAN KADAR PROKSIMAT DALAM BATUBARA MENGGUNAKAN METODE GRAVIMETRI KONVENSIONAL DAN THERMOGRAVIMETRIC ANALYSIS Muhammad Robiansyah; Subur P. Pasaribu; Aman Sentosa Panggabean
JURNAL KIMIA SAINTEK DAN PENDIDIKAN Vol. 5 No. 2 (2021): JURNAL KIMIA SAINTEK DAN PENDIDIKAN
Publisher : Program Studi Kimia - Universitas Sari Mutiara Indonesia

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Abstract

Research on the comparison of the determination of proximate levels in coal using conventional gravimetric methods and Thermogravimetric Analysis (TGA) through comparative tests has been carried out. This study aims to determine the comparison of the average analysis results using the t-test, the precision level of analysis results of each method using CV Horwitz, and the comparison of the precision level of the analysis results using the F test. Based on the results of the t-test showed a significant difference in the average analysis results between the two methods for all parameters. In the test using CV Horwitz for parameters of inherent moisture, volatile matter and fixed carbon using both methods and also ash content using the conventional gravimetric method was declared to meet the precision requirements, but for the ash content parameter using TGA instruments was stated otherwise. The F test for parameters of ash content and inherent moisture showed a significant difference in the precision level of the analysis results between the two methods, but for the parameters of volatile matter and fixed carbon was stated otherwise.
ANALISIS KADAR MERKURI (Hg) DALAM AIR SUNGAI MENGGUNAKAN METODE COLD VAPOR-ATOMIC ABSORPTION SPECTROPHOTOMETRY (CV-AAS) Margaretta D. R. N. S; Subur P. Pasaribu; Aman Sentosa Panggabean
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Analysis of mercury (Hg) levels in river water using the cold vapor-atomic absorption spectrophotometry (CV-AAS) method has been carried out. The basic principle of determining Hg in several river water samples is carried out by means of Hg2+ ions being reduced by reductants Sn2+ into gaseous Hg0 atoms, and then the Hg0 atomic vapors were analyzed quantitatively by the CV-AAS method at a wavelength of 253.7 nm. The analytical performance of the measurements obtained was very good, indicated by the linearity value (r) = 0.991, the Quality Control (QC) value) Hg is below the standard, which is 10%, and the results of mesurement of Hg levels in water samples around range concentration was -1.0305 sampai -0.7328 ppb. These results indicate that the Hg level in river water, according to Government Regulation No. 22 of 2021 concerning Implementation of Environmental Protection and Management, is below the threshold of the quality standard. Keywords: Hg, cold vapor-atomic absorption spectrophotometry (CV-AAS), River waters
PEMBUATAN DAN KARAKTERISASI EDIBLE FILM GALAKTOMANAN DARI BUAH NIPAH (Nypa fruticans Wurmb) DENGAN INKORPORASI EKSTRAK METANOL DAUN TAHONGAI (Kleinhovia hospita L.) SEBAGAI ANTIOKSIDAN Shintia Alifah R; Subur P. Pasaribu; Erwin Erwin; Aman Sentosa Panggabean
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Fabrication and characterization of edible films from galactomannan nipah fruit (Nypa fruticans Wurmb) with the incorporation of methanol extract of tahongai leaf (Kleinhovia hospita L.) as an antioxidant has been conducted. This study aims to determine the best concentration of methanol extract of tahongai leaves to increase the antioxidant activity of edible films using the DPPH (1,1-diphenyl-2-picrylhydrazyl) method. The results showed that the edible film containing galactomannan 1.5%, glycerol 25% and methanol extract of tahongai leaves with concentrations of 0%, 1%, 2%, 3% and 4% showed antioxidant activity with IC50 values of 224.02 mg/L, 215.82 mg/L, 153.51 mg/L, 129.48 mg/L and 107.87 mg/L respectively. The concentration of incorporation of methanol extract of tahongai leaves to produce the best edible film is 3% which increases antioxidant activity when compared to edible films without incorporation with properties having a moisture content of 15.04%, thickness of 0.21 mm, water vapor transmission of 43.70 g/m2/hour and SEM (Scanning Electron Microscopy) analysis showed the surface morphology was homogeneous and slightly rough. Keywords : Edible film; Galactomannan; Tahongai leaves; Antioxidant activity
Pembuatan Edible Film Yang Bersifat Antibakteri Dari Glukomanan Umbi Porang (Amorphophallus Muelleri) Yang Diinkorporasi Dengan Ekstrak Etanol Umbi Bawang Tiwai (Eleutherine Bulbosa (Mill.) Urb.) Anggun Ridha Avitri; Subur P Pasaribu; Winni Astuti
JURNAL KIMIA MULAWARMAN Vol 20 No 1 (2022)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v20i1.1073

Abstract

ABSTRAK Penelitian mengenai pembuatan edible film yang bersifat antibakteri dari glukomanan umbi Porang (Amorphophallus muelleri) yang diinkorporasi dengan ekstrak etanol umbi Bawang Tiwai (Eleutherine bulbosa (Mill.) Urb.) untuk mendapatkan formula edible film glukomanan umbi Porang dan ekstrak etanol umbi Bawang Tiwai yang memiliki aktivitas antibakteri terhadap bakteri Escherichia coli ATCC 25922 dan Staphylococcus aureus ATCC 25923 telah selesai dilakukan. Aktivitas antibakteri ekstrak etanol umbi Bawang Tiwai dilakukan dengan metode difusi agar dengan konsentrasi 2, 4, 6, dan 8% menunjukkan bahwa ekstrak etanol umbi Bawang Tiwai dengan konsentrasi 4% memiliki aktivitas antibakteri terhadap kedua bakteri masing-masing sebesar 13 mm dan 15,83 mm. Formula edible film yang mengandung glukomanan 6%, gliserol 25%, dan ekstrak etanol umbi Bawang Tiwai 4% menunjukkan aktivitas antibakteri terhadap bakteri Escherichia coli ATCC 25922 dan Staphylococcus aureus ATCC 25923 masing-masing sebesar 14,83 mm dan 16 mm.
PREPARATION OF FE-DOPED ZINC OXYSULFIDE (Fe-Zn(O,S)) WITH SURFACE DEFECT FOR HYDROGEN EVOLUTION REACTION Hardy Shuwanto; Jenni Lie; Hairus Abdullah; Subur P. Pasaribu
JURNAL KIMIA MULAWARMAN Vol 20 No 2 (2023)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v20i2.1108

Abstract

In this study, Fe-doped Zn(O,S) has been successfully fabricated by a one-step preparation process using chemical wet method. The Fe-doped Zn(O,S) photocatalysts were studied by varying the content of Fe dopant. The characterizations of Fe-doped Zn(O,S) were carried out by SEM and XRD analyses to determine the morphology and phase of samples. Furthermore, the optical and electrochemical properties were characterized through EIS, TPC, DRS and PL analyses. Briefly, Zn(O,S) with 5% Fe amount exhibited the most optimum condition as compared to other Fe amounts in which it showed better charge separation with the hydrogen evolution amount of 29000 mikromol/g in 10% EtOH solution. Lastly, the proposed mechanism is initially by the trapping of water molecules in the oxygen vacancy (defect) in Fe-Zn(O,S) sample followed by the reduction to generate hydrogen (H2) gas via the intermediate of proton (H+).
EKSTRAKSI DAN PREPARASI GLUKOMANAN UMBI PORANG (Amorphophallus muelleri Blume) SEBAGAI EDIBLE FILM Juntia Kirana Pratiwi; Subur P. Pasaribu; Chairul Saleh; Aman Sentosa Panggabean
PROSIDING SEMINAR KIMIA Vol 1 No 2 (2023): Prosiding SNKT II 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Glucomannan extracted from porang tubers (Amorphophallus muelleri Blume) can be used as a raw material for made edible films. In this research, extraction of glucomannan with graded ethanol method resulted in a yield of 10% and the composition of the edible film forming solution used was 6% glucomannan porang tubers and 25% (w/w) glycerol. The resulted edible film was clear and transparent with the characteristics tested are water content, thickness and water vapor transmission respectvely 20.16%, 0.15 m2 and 22.89 g/m2/hour. Based on the results of SEM analysis showed that the surface of the edible film of glucomannan porang tubers, the morphology of the surface was somewhat smooth but still less homogeneous. So, efforts are still needed to improve the characteristics so that to acording the required standards Keywords: Preparation, edible film, glucomannan, porang tubers
DETERMINATION OF CONTAMINATION LEVELS OF HEAVY METALS LEAD (Pb) AND CADMIUM (Cd) IN FOOD SAMPLES BY CARBON ATOMIC ABSORPTION SPECTROPHOTOMETRY (GRAPHITE FURNACE ATOMIZER AAS/ GF-AAS) Oktavia, Dwina Putri; Panggabean, Aman Sentosa; Pasaribu, Subur P.; Widodo, Nanang Tri
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Research on the determination of lead (Pb) and cadmium (Cd) heavy metal contamination levels using the GFA-AAS method has been carried out in food samples. The aim of this study was to determine the levels of lead (Pb) and cadmium (Cd) metal contamination so that they do not exceed the threshold limit set according to the Food and Drug Supervisory Agency Regulation No. 9 of 2022. The research was carried out by destroying the sample using HNO3(p) and H2O2(p) into microwave. Additions were made of matrix modifiers (mixture of Mg(NO­3)2. 6H2O in 0,5% HNO3 and 1% NH4H2PO4 in 0,5% HNO3 (1:1)). Determination of heavy metal content in food was determined by the Carbon Furnace Atomic Absorption Spectrophotometry (GFA-AAS) method with a wavelength of 283.3 nm for lead (Pb) and 228.8 nm for cadmium (Cd). The results of measuring the levels of heavy metal lead (Pb) contamination in food samples were 0,016 mg/kg and 0,015 mg/kg for the heavy metal cadmium (Cd). Based on the Regulation of the Food and Drug Supervisory Agency No 9 of 2022 concerning Requirements for Heavy Metal Contamination in Processed Foods, the maximum limit for metal contamination of lead (Pb) and cadmium (Cd) in processed food is 0,30 mg/kg, where the results obtained do not exceed threshold, so that the sample is fit for consumption. Keywords: Lead, Cadmium, Carbon Furnace Atomic Absorption Spectrophotometry, Food.
SYNTHESIS AND SWELLING PROPERTIES OF CHITOSAN-BASED HYDROGELS CROSSLINKED FORMALDEHYDE AND TRIPOLYPHOSPHATE Ramadhani, Fadilah; Pasaribu, Subur P.; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Hydrogel is a hydrophilic polymer network that can experience swelling with the ability to absorb and retain large amounts of liquid without decomposing and is widely applied in the fields of health, environment and agriculture. The swelling properties of hydrogels are influenced by the type of tissue and the density of crosslinks that form it. In this study the hydrogel was prepared by stirring a 2% chitosan solution (w/v) as much as 7 mL with 3 ml of formaldehyde-tripolyphosphate crosslinking mixture at variations of 3:0, 2:1, 1:1, 1:2 and 0:3 (v/v) at room temperature and swelling tests were carried out by immersing each hydrogel produced in aquades for a span of 24 hours at the same temperature. Based on the observations, the gel formation time was 420, 97, 84, 75 and 58 minutes respectively which showed the lower the chitosan concentration and the higher the tripolyphosphate, the faster the gel formation process. Then the degree of consecutive sweling was 581.43; 78,23; 75,17; 48.85 and 20.97% (w/w) indicate that covalent cross-networks formed by amine groups on chitosan with aldehyde groups on formaldehyde are more stable and more difficult to degrade than physical cross-networks formed by groups on chitosan and tripolyphosphates. Keywords: Hydrogel, Crosslinking, Chitosan-tripolyphosphate, Degree of swelling.
PERBANDINGAN PENGUJIAN VISKOSITAS LUBE OIL DENGAN MENGGUNAKAN METODE ASTM D-445 DAN ASTM D-7042 Fahmi, Miraz’hul; Pasaribu, Subur P.
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Lubricant is one of the supporters so that the machine can operate optimally within a certain period of time so that the right viscosity is needed. This literature study aims to determine the appropriate method of testing the viscosity of a product. There are two different methods for testing viscosity, namely the ASTM D-445 and ASTM D-7042 methods. In this literature study, operational methods and scope of testing are compared between ASTM D-445 and ASTM D-7042 methods. Based on the results of the literature study, the ASTM D-445 method has a different method from ASTM D-7042. In ASTM D-445 it is a test to determine kinematic viscosity (ν) while in ASTM D-7042 it is a test which includes determining dynamic viscosity (η) and density (ρ). This literature study shows that the ASTM D-7042 method is very effective in the food industry, whereas the ASTM D-445 method is found to be very effective in the natural gas processing industry. Keywords: ASTM D-445, ASTM D-7042, Dynamic viscosity, Kinematic viscosity.
Co-Authors Abdul Aziz Ade R. Fajaryantie Aman S. Panggabean Aman Sentosa Panggabean Andi Fatmawati Padri Hasanah Anggun Ridha Avitri Anggun Ridha Avitri Anwar, Adliah Arie Novadiana Arie Novadiana, Arie Az-zahraa, Mutiara Nur Bagus Muliawan Bohari Bohari Bohari Bohari Bonita Tahir Buchari Buchari Chairul Saleh Chairul Saleh Daniel Daniel Daniel Daniel T Daniel T, Daniel Djihan Ryn Pratiwi, Djihan Ryn Erwin - Erwin - Erwin Erwin Erwin Erwin Eva Marliana, Eva Fadilah Ramadhani Fahmi, Miraz’hul Farida Kristiana Febrianti, Irna Hairani, Rita Hairus Abdullah Hardy Shuwanto Ika Y. L. Sari Indra Masmur Irna Febrianti Jamaran Kaban Jenni Lie Josephine Josephine, Josephine Juntia Kirana Pratiwi Kasmirul Ramlan Sinaga Lianasari, Ika Yekti M. Bachri Amran Magdaleni, Agustina Rahayu Margaretta D. R. N. S Masmur, Hestina Mayang, Julia Agustin Mimpin Ginting Muhammad Robiansyah Nanang Tri Widodo Ningrum, Tika Setia Noviyanti Y Noviyanti Y, Noviyanti Nur, Nana Septiana Nurhasanah Nurhasanah Oktavia, Dwina Putri Putri Istiyanti Putri Istiyanti, Putri Putri, Amelia Rachmat, A. Khafifah Dwi Rico Ramadhan, Rico Ritson Purba, Ritson Rohmat Hidayat Rohmat Hidayat Rudi Kartika, Rudi Ruga, Ritbey Rumengan, Nur Khamillah Saibun Sitorus Septarini, Firda Nurlaili Shintia Alifah R Sujito Sujito Teguh Wirawan, Teguh Wahidatul Nuriah Winni Astuti Wirdhaningsih Wirdhaningsih Yusuf, Irfan Maulana Zia Rahmana Putra