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Daud K. Walanda
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Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia is an electronic open-access journal that aims to publish the latest research results in the area of chemistry education and pure chemistry from academicians, professionals, and other practitioners at all levels of chemistry education. The journal coverage includes the following: current trends of professional chemistry education, educational technology, teacher education, educational science, learning assessment, learning models and development of learning materials, as well as pure chemistry including organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry and other chemistry fields such as environmental chemistry, that emphasis on a broad description of the general methods and processes for the synthesis, modification, and characterization of chemical materials.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 201 Documents
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Nickel Extraction from Morowali Laterite Ore with Chloride Acid (HCl) – Nitric Acid (HNO3) Solution Leonardo, Leonardo; Walanda, Daud K.; Napitupulu, Mery; Ningsih, Purnama
Jurnal Akademika Kimia Vol. 13 No. 1 (2024)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2024.v13.i1.pp1-6

Abstract

Nickel is a metal of high strategic value for human needs to make stainless steel, batteries, and other products. The amount of nickel reserves in the world is about 72 % in rock oxides, and the rest is in sulfide rocks. However, only about 42 % of total nickel production in the world comes from laterite ore, while nickel sulfide is mainly produced. Research was conducted to determine the optimum nickel extraction parameters in a mixture of nitric acid and hydrochloric acid, and to determine the effect of the solvent volume ratio, temperature, and leaching time parameters on the nickel leaching results from laterite samples. This study uses the taguchi¬larger the better method with each factor having three levels of conditions, namely the volume ratio of the solvent using variations of 1: 1, 1: 2, and 2: 1 then variations in temperature of 30°C, 60 °C, and 90 °C as well as variations in the leaching time of 3 hours, 6 hours, and 12 hours. The optimum conditions for nickel extraction are a parameter ratio of 1:1, a temperature of 90 °C, and a leaching time of 6 hours. The results of atomic absorption spectrophotometer analysis showed that the concentration of Ni2+ at optimum conditions was 10.7895 ppm, and the recovery value was 2.54 %.
Application of Think-Pair-Share (TPS) Cooperative Learning Model to Student Learning Outcomes in Hydrocarbon Material in Senior High School Kifli, Moh.; Mustapa, Kasmudin; Ratman, Ratman
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp221-225

Abstract

This study aims to describe the improvement of student learning outcomes by applying the Think-Pair-Share (TPS) cooperative learning model on hydrocarbon material in class XI SMA Negeri 2 Sigi. This study's research type is pre-experimental with a one-group pretest posttest design. This study utilized purposive sampling. The sample consisted of two classes: class XI IPA 3 as the experimental class 1 (n = 22) and class XI IPA 4 as the experimental class 2 (n = 24). Student learning outcomes data are processed using the learning improvement test (N-gain). The application of the Think Pair Share (TPS) cooperative learning model to improve student learning outcomes on Hydrocarbons can be seen from the average N-gain value in the two experimental classes, including in the high category, namely 0.77 and 0.78. Therefore, applying the Think Pair Share (TPS) cooperative learning model can improve student learning outcomes on average greater than 75 (KKM) of SMA Negeri 2 Sigi students in Class XI on hydrocarbon material.
Analysis Of Flavonoid Levels on Skin Langsat Fruit (Lansium Domesticum) Using Uv-Vis Spectrophotometer Almarza, Almarza; Said, Irwan
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp226-229

Abstract

Langsat fruit (lansium domesticum) is a plant included in the family meliaceace. Several compounds were reported to have been isolated from multiple constituents in langsat plants that contain lansic acid, triterpene amino sugar glycoside, and dukunolides A- C, tetranortripenoid was dukunolides D- F. With the development of sciense a lot of research on ingredients and benefits langsat fruit both the pulp of the fruit and the skin. Empirically, the skin of the langsat fruit has been used as an anti-oxidant and anti-cancer treatment. Langsat fruit skin is an essential source of bioactive components such as phenols, flavonoids, tannins, saponins, triterpenoids, and alkaloids. This study used a UV-Vis spectrophotometer to determine the levels of flavonoids in the ethanol extract of langsat fruit peel (Lansium domesticum). This study aims to determine the levels of flavonoids in the skin of langsat fruit (lancium domesticum) by comparing the wet and dry fruit skin. Extraction of the chemical content of langsat fruit skin (Lansium domesticum) was carried out by the meseration method using ethanol 70.0/0. The determination of flavonoid levels in langsat fruit peel extract was measured at 520 nm and 700 nm from the result of the study. The total flavonoid levels of each sample were 2.856 mg /100 grams of alkaline fruit skin and 4.209mg /100 grams of dried langsat fruit peel. This shows that dried langsat fruit peel samples have high anti-oxidant power and alkaline fruit peel extracts.
Analysis of the Characteristics of Chemical Compounds in Palm Flour (Arenga pinnata) from the Poso District Poima , Deswita K.; Abraham, Paulus H.
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp230-233

Abstract

Aren (Arenga pinnata) is a palm family with the potential to develop high economic value in tropical regions such as Indonesia. This study aims to determine the levels of each chemical compound contained in palm flour (protein, fat, carbohydrate, potassium, and calcium levels). Determination of protein, fat, and carbohydrate levels in this study using a UV - VIS spectrophotometry tool. Determination of potassium (K) and calcium (Ca) levels using a flame photometer. The results showed that the analysis of protein content obtained 1.5765 %, fat content obtained 1.465 %, and carbohydrate content obtained 55.88 %. The analysis of potassium content obtained 1.76 %, and calcium levels obtained 1.495 %. The results of this study are expected to be foodstuffs that can be processed into food to meet the needs of protein, carbohydrates, fat, potassium, and calcium in the body.
Analysis Levels of Calcium Oxide (CaO) in Limestone from Leok Village, Biau Sub-district, Buol District Tiwow, Vanny M. A.; Istiqomah, Almia; Abram, Hengky P.; Nurmayanti, Yuli
Jurnal Akademika Kimia Vol. 13 No. 1 (2024)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2024.v13.i1.pp20-24

Abstract

Limestone is one of the rocks that is very abundant in Indonesia and has many benefits, especially in the field of industry. This study aims to determine the levels of calcium oxide (CaO) in limestone at Desa Leok, Kecamatan Biau, Kabupaten Buol. XRF (X-ray fluorescence) was the analytical technique utilized to ascertain the amount of calcium oxide (CaO) present in the limestone.  Both the coast area and the hill area provided samples. The measurement results indicate that the level of CaO is 92.41 % in the coast area and 93.74 % in the hill area.
Analysis of Primary Metabolic Compounds in Durian Seed Flour (Durio zibethinus Murr) Typical of Central Sulawesi (Parigi Moutong) Nurhalisa, Nurhalisa; Said, Irwan; Sakung, Jamaluddin M.; Jura, Minarni R.
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp234-237

Abstract

This study aims to determine the carbohydrate, protein, and fat content of durian (Durio zibethinus Murr) seeds from Parigi Moutong. This study consisted of two samples, namely, sample A (crushed durian seeds) and sample B (mashed and sifted durian seeds)—Soxhlet method. The results obtained in sample A for carbohydrate content of 52.8 %, protein 3.50 % and fat 2.06 % while in sample B for carbohydrate content of 43.2 %, protein 2.27 % and fat 2.25 %. Based on the results obtained, durian seed flour can be used as processed food and can be of economic value if it is further processed and traded.
Biofoam from The Waste of Durian Seeds and Corn Cobs Mabela, Megawati K.; Sabang, Sri M.
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp238-241

Abstract

Biofoam is a styrofoam substitute packaging made with starch and fiber as the basic ingredients. This study aims to determine the characteristics (biodegradation test, pressure strength and water absorption) of biofoam produced from durian seed waste and corn cobs. The best treatment in this study was biofoam made using a mixture of durian seeds starch and corn cobs fiber made with 5 % NaOH concentration, where the results obtained were the water absorption test values with 1 minute, 2 minutes, and 3 minutes, namely 11.20 %, 14.22 % and 16.81 %. While the compressive strength test value obtained is 16.85 10-5 Pa, and the results of the biodegradation test are obtained at 35.42 % within 14 days of burial in the soil. The FTIR test results showed that the biofoam groups produced from a mixture of corn cob fibers with different concentrations of NaOH still showed similarities in their functional groups, where none gave rise to new peaks. The functional group content of the resulting biofoam includes the CH group (alkane) and the C. C Group (alkyne) C=C group (aromatic ring and OH group.
Coagulant Capacity of Moringa (Moringa Oleifera) Seed on NaCl Solution Sibulo, Vanesa; Abram, Paulus H.
Jurnal Akademika Kimia Vol. 12 No. 4 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i4.pp2242-246

Abstract

Moringa seeds are one of the natural coagulant ingredients that contain protein and carbohydrates that can be used in water purification, especially in reducing turbidity. This study aims to determine the level of NaCl coagulated by Moringa seed powder. The capacity or coagulation ability of Moringa seed powder is measured by the percentage of NaCl in the solution coagulated by Moringa seed powder. To achieve this purpose, several experiments have been used, namely variations in the concentration of NaCl as samples including; 0.5 %, 1 %, 3%, and 5% with treatment using Moringa seed powder as much as 1 g, 3 g and 5 g—determination of NaCl content using Flame Photometers BWB Technologies. The results of this study indicate that the optimum level of NaCl coagulated by Moringa seed powder is 3 %. The concentration can increase the effectiveness of reducing NaCl levels by obtaining a coagulated percentage value of 95.30 %.
Analysis of Metal Content in Rocks Using X-Ray Fluorescence (XRF) Napitupulu, Mery; Maharani, Tiara; Walanda, Daud K.; Said, Irwan
Jurnal Akademika Kimia Vol. 13 No. 1 (2024)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2024.v13.i2.pp7-13

Abstract

Rocks in mining have different types and levels of metal from one another. This study aims to determine the levels of metals present in rocks found in illegal mining areas in the Dongi-Dongi region. The parameters tested are the type of metal contained in rocks from unlawful mining in the Dongi-Dongi area and the amount of metal content in rocks from illegal mining in the Dongi-Dongi area. The results showed that the metals contained in the five rock samples from gold mining in Dongi - Dongi were, respectively, iron (Fe), potassium (K), silicon (Si), calcium (Ca), titanium (Ti), arsenic (Ar), zirconium (Zr), manganese (Mn), rubidium (Rb), niobium (Nb), molybdenum (Mo), indium (In), strontium (Sr), tin II (Sn), and rubidium (Ru) with the highest metal percentage found in the fifth rock sample (E), namely iron (Fe) at 62.89 % and potassium (K) at 54.7 %. The high content of iron and potassium in Dongi-Dongi mining rocks has the potential to be utilized by the community, as these metals are widely used in various industrial fields.
Analysis of Levels of Phosphorus and Magnesium in Beef Bones from Kaledo Waste Isnawiyah, Nurzaida; Hamzah, Baharrudin; Aminah , Sitti; Tiwow, Vanny M. A.; Hardani , Ririen
Jurnal Akademika Kimia Vol. 13 No. 1 (2024)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2024.v13.i1.pp25-31

Abstract

The Kaili tribe is a tribe with a very distinctive and well-known culinary heritage in Indonesia, one of which is Kaledo (donggala soft leg). The large number of restaurants and restaurants that provide Kaledo menus raises problems, namely the lack of utilization of beef bones from Kaledo waste, causing environmental issues. The community does not know much about the types of minerals contained in the beef bones. Among them are the minerals contained in beef bones, namely phosphorus and magnesium. This study aims to determine the levels of phosphorus and magnesium in beef bones from Kaledo waste taken randomly from Kaledo restaurants in Palu City. Determination of phosphorus and magnesium levels in beef bones from Kaledo waste using a Uv-Vis spectrophotometer and an atomic absorption spectrophotometer (AAS). The results showed that the analysis of the phosphorus content of beef bones from Kaledo waste obtained 95.125 mg / 100 g, and the magnesium content was 102.9 mg / 100 g. The results of this study are expected to be a source of information about the levels of phosphorus and magnesium contained in beef bones from Kaledo waste and can be used further as a substance in the utilization of beef bones from Kaledo waste.

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