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KOVALEN: Jurnal Riset Kimia
Published by Universitas Tadulako
ISSN : -     EISSN : 24775398     DOI : https://doi.org/10.22487/kovalen
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
KOVALEN: Jurnal Riset Kimia is a peer-reviewed journal of chemistry published by the Tadulako University, Indonesia. This journal concern with publishing the original research articles, review articles, and the current issues related to chemistry. Publishing frequency 3 issues per year, in April, August, and December.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 14 Documents
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Search results for , issue "Vol. 8 No. 3 (2022): December Edition" : 14 Documents clear
Sintesis dan Karakterisasi Fe₂TiO₅ dari Besi Oksida dan Titanium Dioksida dengan Metode Planetary Ball-Mill: Synthesis and Characterization of Fe₂TiO₅ from Iron Oxide and Titanium Dioxide Using the Planetary Ball-Mill Method Laode Kadir; M. H Azis; S. Musiam; V. A. Fabiani; Karnelasatri; D. Permana; T Azis; Syahrir
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.15644

Abstract

The method of solid hydrogen storage through integration in metal hydride compounds is a new, promising method. This research has succeeded in synthesizing and characterizing the metal hydride alloy Fe-Ti system through a planetary ball-mill process. Based on the XRF analysis, it was found that the composition of Fe oxide content reached 56.22% while Ti oxide reached 43.78%. The FTIR study showed absorption at wavenumbers of 900 cm-1 and 500 cm-1. Both are typical absorptions for Ti-O and Fe-O groups, suggesting that the synthesized sample was successful. It can be seen from the XRD data that some of the diffractogram peaks of the resulting Fe-Ti compound match the peaks of the Fe2TiO5 and TiO2 compounds obtained from the Powder Diffraction File (PDF) database number 00-003-0374. After the refinement was performed, information was obtained that the synthesis of Fe-Ti alloy material using the planetary ball mill technique produced Fe2TiO5.
Aktivitas Afrodisiak Ekstrak Etanol Daun Tumbuhan Bungkus (Smilax rotundifolia L.) terhadap Fertilitas Tikus Putih Jantan (Rattus norvegicus): The Aphrodisiac Activity of Ethanol Extract of Bungkus Leaf (Smilax rotundifolia L.) on The Fertility of White Male Rats (Rattus norvegicus) Ayu Wulandari; Recky Patala; Kiki Rizki Handayani; Monica Sandra Makatang
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.15825

Abstract

Aphrodisiac is a substance that can increase stamina, libido (sexual desire), and male fertility. This study aims to determine the secondary metabolites contained in the leaves of the Bungkus plant (Smilax rotundifolia L.), to determine the aphrodisiac activity of the leaf extract of the Bungkus plant on the fertility parameters of male white rats (Rattus norvegicus). This study used an experimental method with a modified post-test randomized controlled group design using 15 male white rats and 30 female white rats which were divided into 3 treatment groups, namely pairing each male rat with 2 female white rats (1 : 2). Each group consisted of 5 male rats and 10 female rats, namely the normal control group (NaCMC 0.5%), the positive control group (X-Gra 51.37 mg/kgBW), the control group the leaf extract test sample of the Bungkus plant (S. rotundifolia L.) with a dose of 200 mg/kgBW. The research data were analyzed using the SPSS 25 statistical test. The results of this study indicate that the leaf extract of the Bungkus plant contains secondary metabolites flavonoids, saponins, alkaloids and tannins. The administration of Bungkus leaf extract at a dose of 200 mg/kgBW showed a difference in the percentage value of the pregnancy index and a significant effect on the fertility index value.
Pengaruh dari Konsentrasi Elektrolit Tembaga Asetat-Asam Asetat dan Temperatur terhadap Efisiensi Arus pada Elektrodeposisi Baja Karbon Rendah dengan Tembaga: Effect of Electrolyte Concentration of Copper Acetic-Acetic Acid and Temperature on Current Efficiency in Electrodeposition of Low Carbon Steel with Copper Widya Yeni Rawati; Warsono; Sri Widarti
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16023

Abstract

One example of an electrolysis practicum module at the Chemistry Laboratory is the plating of copper on low-carbon steel metal with cyanide as the electrolyte. This cyanide electrolyte is commonly known as Zonax Copper. Due to the dangerous cyanide content, a replacement electrolyte that is safe, cheap, and easy to obtain for student practicum scales is sought. The purpose of this study was to determine the optimum temperature and composition of copper acetate-acetic acid as indicated by the largest current efficiency value. The composition of Cu-Acetate/Acetic Acid varied 0.2/0.4; 0.4/0.6; 0.6/1.2; 0.8/1.6, and 1/2 gram/250 mL. The coating process was carried out at temperatures of 30, 40, 45, 50, and 60oC with an electrodeposition time of 10 minutes. The results show that the highest current efficiency was found in the composition (CH3COO)2Cu/CH3COOH 1gram/ 2 ml, temperature 45℃ by 93%. The effect of temperature on current efficiency is in the form of a second-order polynomial with a correlation of research results >90%. The average maximum temperature is 42.68oC and the largest current efficiency is 96% at a concentration of (CH3COO)2Cu/CH3COOH 0.6 gr/1.2 ml. The current efficiency is directly proportional to the logarithmic concentration at temperatures of 30, 40, 45, and 50oC.
Validasi Metode Penetapan Kadar Logam Kadmium (Cd) dalam Sampel Tanah Menggunakan Spektrofotometer Serapan Atom (SSA)-Nyala: Validation of the Method Determination of Cadmium Metal (Cd) Using Flame Atomic Absorption Spectrophotometer (AAS) Tita Rosita; Dewi Arfina Prasetyo Ningrum; Yuli Yanti; Zaekhan
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16028

Abstract

Soil has an important role in life on earth because it supports plant life by providing nutrients and water as well as supporting roots. One of the chemical elements that cause pollution is cadmium. The standard method for analyzing the content of cadmium metal in the soil is using a Flame Atomic Absorption Spectrophotometer (AAS) referring to SNI 8910:2021. This method changes the weight content from one gram to five grams of sample to obtain cadmium metal levels that can be detected by the instrument. Therefore, this method needs to be validated before being used for routine analysis in the laboratory. The validation parameters are linearity, precision, accuracy, method detection limit, and robustness. The Validation results were obtained for the linearity parameter correlation coefficient value of r = 0.999, %RSD repeatability precision parameter of 1.51%, and the intermediate precision was obtained by %RSD analyst 1 : 1.51% and analyst 2 : 0.82%, accuracy parameter obtained the %recovery results were (88.73-97.01)%, the LDM parameter was obtained at 2.03 mg/kg, the robustness parameter was obtained by F-count of 1.25 and F-table of 3.40 which shows the average assay of metals Cd weighing 1, 3, 5, and 8 grams that were not significantly different. Overall, the results of the validation show that the method of assaying cadmium metal using Flame-AAS complies with the acceptance requirements, therefore it can be used for routine analysis in the laboratory.
Studi Pemanfaatan Limbah Cair Ikan dan Udang sebagai Substrat dalam Produksi Listrik pada Sistem Microbial Fuel Cell (MFC): Study of Utilization of Fishery and Shrimp Wastewater as Substrate in Electricity Production in Microbial Fuel Cell (MFC) System Alfiah Alif; Muhamad Jalil Baari; Amalyah Febryanti
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16033

Abstract

Microbial fuel cell (MFC) is a technology that utilizes bacteria in organic medium that can convert chemical energy into electrical energy. This technology can be used to treat fishery waste and shrimp waste which is rich in organic matter. This study aimed to measure the performance of the MFC system on fishery wastewater and shrimp wastewater as a means of producing bio-electricity while reducing the waste load. This study used different types of electrodes, including zinc, aluminum, copper, and carbon graphite. This technology used 0.2 M KMNO4 electrolyte solution. The research method includes three stages; production of fishery wastewater and shrimp wastewater, assembly of a dual chamber MFC bioreactor, and measurement of waste electrical energy produced. The value of electricity production with the highest average in fishery wastewater was obtained by adding electrolyte solution to the Zn/Cu electrode during 117 hours of observation were 6.86 mA with a potential difference of 1.469 V meanwhile in shrimp wastewater was obtained by adding electrolyte solution to the Al/Cu electrode were 4.38 mA with a potential difference of 1.335 V.This study can be concluded that higher electricity production is obtained from the utilization of fish wastewater using Zn/Cu electrode.
Penambatan Molekuler Penghambatan Aktivitas Enzim α-Amilase dan α-Glukosidase oleh Senyawa Aktif Daun Kirinyuh (Chromolaena odorata L.): Molecular Docking for Inhibition of α-Amylase and α-Glucosidase Enzyme Activities by Active Compounds of Kirinyuh Leaves (Chromolaena odorata L.) Nelson Gaspersz; Matthew Adi Honey Amos; Sitti Hardiyanti Kalauw; Indrid Harjuni; Mario R. Sohilait
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16046

Abstract

An in silico study was conducted to inhibit the active compound in Kirinyuh leaves (Chromolaena odorata L.) against α-amylase and α-glucosidase enzymes using a molecular docking approach. The docking was carried out on 19 active compounds that had been identified in Kirinyuh leaves and were optimized using the PM3 method. The best results in inhibit on of the α-amylase enzyme were shown by compounds from the flavanone group, namely genkwanin and sakuranetin with binding affinities of -8.3 kcal/mol and -8.1 kcal/mol, respectively, while the best results in inhibiting on of the α-glucosidase enzyme were shown by two compounds from the hydroxybenzoic acid group, namely p-coumaric acid and p-hydroxybenzoic acid with bond affinities of -5.7 kcal.mol and -5.5 kcal.mol, respectively. The interaction between α-amylase with genkwanin and sakuranetin produces one conventional hydrogen bond GLU 233 and GLN 63 respectively. The interaction between α-glucosidase with p-coumaric acid and p-hydroxybenzoic acid produces three conventional hydrogen bonds, HIS 112; GLN 182; ASP 352 and GU 277; GLN 279; ASP 352.
Arang Aktif Ampas Tebu Termodifikasi Kitosan sebagai Adsorben Tetrasiklin: Pemanfaatan Metode Kolom: Chitosan Modified Sugarcane Bagasse Activated Charcoal as Tetracycline Adsorbent: Utilization of the Column Method Gatut Ari Wardani; Adinda Nur Octavia; Mochamad Fathurohman; Taufik Hidayat; Estin Nofiyanti
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16090

Abstract

Currently, antibiotics are considered environmental pollutants because of their undesirable effects on human health and the environment, including the waste of antibiotics tetracycline hydrochloride. While on the other hand, bagasse is an agricultural waste that has no economic value. This study aims to study the characteristics of activated charcoal from bagasse and the use of bagasse as chitosan-modified activated charcoal using the column method to determine the variation of adsorbent height, flow rate, and acidity of the solution in the ability of the bagasse adsorbent to adsorb tetracycline hydrochloride. Bagasse goes through a carbonation process using a furnace at a temperature of 350°C until charcoal is formed. The next process is activation using 2 M phosphoric acids and compared based on SNI 06-3730-1995 regarding technically activated charcoal. Determination of functional groups using Fourier Transform Infra-Red, adsorbent morphology using Scanning Electron Microscope, and crystallinity using X-Ray Diffraction. The concentration of tetracycline hydrochloride before and after adsorption was measured using an Ultra Violet-Visible spectrophotometer. The best absorption results in the adsorption process were found at the adsorbent height of 14 cm (99%), the flow rate of 0.5mL/minute (92%), and pH 4 (93%).
Analisis Kadar Merkuri (Hg) pada Rambut Pekerja Tambang di Pertambangan Emas Tanpa Ijin (PETI) Kabupaten Parigi Moutong dalam Hubungannya dengan Frekuensi Konsumsi Ikan: Analysis of Mercury (Hg) Levels in Hair of Gold Miners at Ilegal Gold Mining Activities of Parigi Moutong Regency in Relation to Frequency of Fish Consumption Musafira; Ernawaty Rasul
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16121

Abstract

Illegal gold mining is a mining activity using traditional methods. Mining activities in the traditional way process mining products using the amalgamation process. In the amalgamation process, gold is bound by adding mercury and the waste from the amalgamation process which may still contain mercury is discharged into the environment. It can have an impact on the accumulation of mercury in humans, especially the miners either directly or through the food chain. This study aims to determine the amount of mercury concentration that has accumulated in miners' hair in relation to the frequency of fish consumption. The sampling method is done by random sampling method in five sub-districts in Parigi Moutong Regency. Fish consumption frequency data was taken by filling out questionnaires by respondents (miners). Analysis of mercury content in hair samples was carried out using the Mercury Analyzer NIC MA-3000. The results showed that the concentration of mercury in miners in all sub-districts exceeded the quality standard set by USEPA, which was above 1 mg/Kg. The highest mercury content was found in the miner's hair in Moutong District which was 3.48 mg/kg, while the lowest mercury content was found in the miner’s hair in Kasimbar District which was 1.06 mg/kg. Based on these results, the gold miners in the five sub-districts have been contaminated with mercury. A correlation value above 0.5 indicates a correlation between fish consumption and mercury concentrations in hair, thereby it can be said that the source of mercury exposure to miners can also come from the fish they consume.
Pengaruh Konsentrasi Ekstrak Daun Eboni dan Daun Sirsak Terhadap Retensi Bahan Pengawet pada Kayu Durian (Durio zibethinus): The Effect of Concentration of Ebony and Soursop Leaves Extracts on Retention of Preservatives in Durian Wood Asniati; Muthmainnah
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16127

Abstract

Durian wood is one type of wood that has a low level of durability, therefore it is necessary to make efforts to increase the durability of wood. These efforts can be done by preserving the durian wood by using natural preservatives, namely ebony leaves extract and soursop leaves. Ebony and soursop leaves extracts were used as natural preservatives with different concentrations using the cold soak method on durian wood. The research conducted aims to determine the effect of extract concentration on the retention of preservatives. Ebony leaves and soursop leaves were extracted by maceration method in 96% ethanol solvent for 24 hours. The durian wood sample was preserved using the cold soaking method for 1 hour using ebony leaves extract and soursop leaves extract at concentrations of 1%, 2%, and 3%. The results showed that the highest retention of preservatives from ebony leaves extract and soursop leaves extract was the use of 3% concentrations of 0.661 kg/m³ and 0.676 kg/m³, respectively. The results of the analysis of variance showed that the extract concentration had a significant effect on the retention value. The concentration of preservatives from ebony leaves extract and soursop leaves is directly proportional to the retention value of preservatives. Preservative retention of soursop leaves extract is better than ebony leaves extract.
Potensi Cangkang Telur Ayam dan Cangkang Telur Bebek sebagai Bioadsorben Logam Pb dari Limbah Cair Industri Farmasi: Potency of Chicken Eggshells and Duck Eggshells as Pb Metal Bioadsorbents from Pharmaceutical Industry Liquid Waste Lisna Dewi; Ginayanti Hadiesobroto; Hesty Nuur Hanifah
KOVALEN: Jurnal Riset Kimia Vol. 8 No. 3 (2022): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2022.v8.i3.16133

Abstract

The pharmaceutical industry liquid waste is one of the wastes that have the potential to produce waste containing heavy metals. One of the highest metal contaminants originating from the pharmaceutical industry is lead (Pb). Pb metal can cause health problems and pollute the environment. One way to treat Pb waste is by the adsorption process using bioadsorbent. The eggshell waste can be used as an adsorbent to absorb heavy metals. The eggshell contains calcium carbonate, therefore it can be used as an adsorbent. This study aims to determine the optimum pH, optimum mixing time, and optimum mass of chicken eggshell powder and duck eggshell powder, and to determine the comparison of the effectiveness of adsorption between chicken eggshell powder and duck eggshell powder as bioadsorbent of heavy metal Pb in pharmaceutical industry wastewater by using Atomic Absorption Spectrophotometer (AAS) at a wavelength of 283.3 nm. The results showed that the eggshell samples had the optimum pH at pH 4, the optimum mixing time was 45 minutes, and the optimum mass was 125 mg, with the effectiveness of Pb adsorption of 92.75%. While the duck eggshell samples obtained the optimum pH at pH 2, the optimum mixing time was 30 minutes, and the optimum mass was 125 mg, with the effectiveness of Pb adsorption of 93.66%. Chicken and duck eggshells have the potential to be used as an alternative bioadsorbent in wastewater treatment.

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