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Moondra Zubir
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Chemistry Department , State University of Medan Jl. Willem Iskandar Pasar V, Medan Estate Medan, Indonesia
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INDONESIA
Indonesian Journal of Chemical Science and Technology
Published by Universitas Negeri Medan
ISSN : 26221349     EISSN : 26224968     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Jurnal ini mempublikasikan artikel di bidang Kimia yang meliputi penelitian dasar dan terapan. Bentuk Publikasi di Indonesian Journal of Chemical Science and Technology : * Artikel * Review (berdasarkan permintaan Dewan Redaksi) * Communication (berdasarkan permintaan Dewan Redaksi)
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 9 Documents
 1 
Search results for , issue "Vol 2, No 2 (2019): July 2019" : 9 Documents clear
Application of Humid Silica Plus Fertilizer with Various Combinations of Planting Media Thomson A.S. Girsang; Veny Apriyani; Desti S.N Pasaribu; Lisnawaty Simatupang
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.14000

Abstract

Volcanic ash contains minerals needed by soil and plants with the highest composition of total elements, namely Ca, Na, K and Mg, other macro elements in the form of P and S, while micro elements consist of Fe, Mn, Zn, Cu. The layer of volcanic dust that has the potential to contain nutrients for soil fertilization for agriculture can actually only be used about 10 years after the spread of volcanic ash. Soil fertilization can be accelerated if mixed with organic materials such as by using chicken manure fertilizer which has nutrients from chicken manure: N = 1.7%, P2O5 = 1.9%, K2O = 1.5%. Humic acid helps regulate clay and soil improvement, binds and transfers micro elements from the soil to plants, increases water absorption, and stimulates the development of microorganisms in the soil. Therefore, this study was conducted to make humic silica fertilizer in the planting medium by utilizing volcanic ash in combination with chicken manure mixed with soil. In this study apart from being a source of humic acid, chicken manure is also beneficial because it contains microorganisms which will be useful in accelerating the fertilizer incubation process. The composition of the fertilizer mixture used in this study is: volcanic ash sinabung: chicken manure: soil = 20: 50: 30; 30: 50:20; 40: 50: 10. The mixture is stirred evenly and then incubated for 30 days. After 30 days, the nutrient content of these fertilizers was tested and the highest content of the nutrients obtained in the combination was 20:50:30 namely: Organic C-1.35%, N-total 0.2%, P-available 20.16 ppm , K-available 0.527 me / 100g, C / N 6.75%, and humic acid contained in 3.925%
Pb(II) and Oil Contamination Analysis of Belawan Sea, Medan City, North Sumatera Lili Nur Indah Sari Tarigan; Nurul Qodri; Septi Lumongga Duma rangkuti; Moondra Zubir
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.16321

Abstract

Belawan waters are very densely populated with shipping, industrial and settlement. These various activities have an impact in the form of sea pollution by liquid waste such as Pb (II) and oil. Based on the results of the analysis of the content of Pb (II) in the highest waters, which is equal to 26.9120 ppm, it exceeds the threshold. The oil content in the waters has exceeded the threshold of 0.05 gr / L. One way to reduce the levels of Pb (II) and oil is by using coconut husk biosorbent. This is evidenced by the results of the analysis that there was a decrease in Pb (II) metal content after adsorption using coconut coir biosorbent which was equal to 6.2430ppm with adsorption capability of 20,699 ppm. The oil content in the water after the water is adsorbed using coconut coir biosorbent shows the Not Applicable result because the seawater sample has been homogenized so that no significant changes occur. This shows that coconut coir biosorbent is effective to reduce the content of Pb and Oil in water in the waters of the sea.
Synthesis and Characterization Nanomagnetite by Co-precipitation Rahimah Rahimah; Ahmad Fadli; Yelmida Yelmida; Nurfajriani Nurfajriani; Zakwan Zakwan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.13995

Abstract

Magnetite (Fe3O4) nanoparticles becomes a new innovation that gets attention of biomedicine scientists. Magnetite can be applied to cancer treatment as a drug carrier because it’s good biocompatibility and very low toxicity. The aim of this study was to determine the effect of temperature and retention time on the magnetite particle characteristics prepared by co-precipitation method. The first, FeCl3 and FeCl2 with 2:1 mole ratio were reacted with 10% NH4OH at 40 - 80°C temperatures during 1 – 30 minutes in a beaker glass. Subsequently, the precipitate was separated using filter paper and it dried into air oven at 100°C. The characteristic of obtained magnetite powder were determined using XRD and SEM. From XRD pattern indicates that magnetite formed at all temperatures with crystallite diameter in the range of 7-13 nm. The SEM results indicate the agglomeration of the magnetite particles with size in the range of 1.37 to 1.72 μm. In the other hand, the higher of temperature and retention time will make the agglomeration of the particles become more uniform. The increasing of temperature and the retention time will increase the magnetite crystallinity level.
Synthesis of Biodiesel From Rubber Seed Oil with Acid and Base Activated Natural Zeolite Catalyst Tiamina Nasution; Akhir Mauludin Pulungan; Yuli Asih Wiliranti; Junifa Layla Sihombing; Ahmad Nasir Pulungan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.14001

Abstract

 In this study, biodiesel synthesis was carried out using Z-AH and Z-OH Zeolite catalysts to obtain a cheaper and environmentally friendly process. The catalysts were prepared from Sarulla Indonesian natural zeolite       (Z-AS) through a chemical activation process with certain HCl 3 M and NaOH 2 M, then calcined at 500°C with Nitrogen gas for 4 hours to obtain Z-AH ang Z-OH catalyst. The catalysts were characterized by FT-IR and XRD. The conversion of rubber seed oil into biodiesel was carried out at temperature of 30 oC, 60 oC and 90 oC. The ratio of methanol: rubber seed oil is 6: 1 (v / v) and the catalyst concentration used is 1% wt. The XRD and FTIR data show that Z-AS activation increases the crystallinity of zeolite and does not damage the zeolite skeletal structure.The Z-AH catalyst has a better catalytic activity than the Z-OH catalyst with the conversion value of the biodiesel product obtained at 69.79%.
Red Spinach (Alternanthera amoena voss) as an Environmental Friendly Acid Base Indicator Sri Adelila Sari; Suriati Nilmarito
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.13997

Abstract

Natural indicators are indicators that are continuously developed to determine whether a sample is acidic or basic. This study examined how red spinach can be developed into an environmentally friendly acid-base indicator that intends to be non-toxic, easy to obtain, and affordable. The natural indicator used in this study was red spinach leaf extract (Alternanthera amoena voss). The samples used were salt water, tea, pineapple, detergent, and oranges. Red spinach leaf extract was dropped on each sample which had a volume of 150mL resulting in a color change. The results of this study indicated that red discoloration occurs in samples of salt water, tea, oranges, and pineapples according to their acidic properties. Furthermore, detergent water turned to a bluish green color, and according to the basic properties of a detergent. This study concluded that red spinach leaf extract can be used as an environmental friendly natural indicator.
Effect of Dragon Fruit Juice Addition on Changes in Peroxide Numbers and Acid Numbers of Used Cooking Oil Sri Adelila Sari; Tika Rahayu Putri; Muhammad Rudi AR
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.15449

Abstract

Many foods from Indonesia are cooked through the frying process using cooking oil. Good cooking oil is oil that has a low amount of peroxide and acid. The purpose of this study was to find the effect of adding dragon fruit juice (Hylocereus undatus)to peroxide numbers and acid numbers in used cooking oil. Peroxide numbers were measured using the iodometry method, whereas acidic numbers were carried out by the acid-base method. The results of this study indicated that after the addition of dragon fruit juice the peroxide number was dropped to 2.4 meg / kg, whereas in acid numbers an acid number was increased to 6.08 percent.
Combination of Sinabung Volcanic Ash and Humic Acid Against Characteristics of Humid Silica Fertilizers Veny Apriyani; Thomson A.S Girsang; Ribka Sirait; Lisnawaty Simatupang
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.13998

Abstract

Volcanic ash from Mount Sinabung has a large silica (SiO2) content of 69,93% and contains minerals needed by soil and plants. This potential cannot be directly utilized due to the acidic nature of volcanic ash which can damage plants. To be used as fertilizer, the process can be accelerated by adding humic acid from chicken manure. So the purpose of this study is to manufacture humic silica fertilizer by combining volcanic ash with humic acid from chicken manure and and  the characteristics of humic silica fertilizer. In this study a method of extracting humic acid from chicken manure was used using sodium hydroxide (NaOH) 0,25 M solution and mixing volcanic ash with humic acid. The results of humic acid extract from chicken manure were then combined with volcanic ash from sinabung. Nutrients from the combination obtained at variation 60:40 with the highest organic C were 1.37%, N total 0.24%, Phosphate 20.64 ppm and Potassium 0.664 me / 100g with pH fertilizer 6 and crumb texture and free neutral which indicates the fertilizer is ready to use.
Utilization of Glycerol from Used Oil as an Ester Glycerol Surfactant Dian Wardana; Ahmad Ramadhan; Dinda Prihatini Fitri Amne; Eddiyanto Eddiyanto
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.13999

Abstract

The development of biodiesel which is currently increasing has helped increase glycerol as a by-product. The glycerol can be obtained from a transesterification reaction in either vegetable or animal oils or fats and even used cooking oil. Glycerol buildup without further processing can reduce the selling price of glycerol. One solution to overcome this is to convert it to surfactants such as glycerol esters which are widely used in various industries such as chemistry, food, cosmetics, medicine and textiles. This study aims to utilize used cooking oil as a source of glycerol used in the synthesis of glycerol ester surfactants, as well as to compare the quality of glycerol ester surfactants produced by the use of commercial glycerol. The process begins by isolating glycerol from used cooking oil and then purifying it to improve its quality. Then glycerol ester was synthesized by using stearic acid, palmitic acid and oleic acid at reaction times of 120, 150 and 180 minutes. The highest yield of ester glycerol produced was at the reaction time of 180 minutes for each use of fatty acids. The test results showed that the glycerol ester produced was able to reduce the surface tension of the water. The value of hydrophylic-lipophylic balance (HLB) is not much different in the range of 5, and the use of various fatty acids and different sources of glycerol results in % of the stability of different emulsions.
Using Water Hyacinth Fiber ( Eichhornia Crassipes) as Heat Absorbers Media In Wall Muhammad Rahmatullah Amin; Sefri Wahyu Fernando Gultom; Fitrisia Krisa Bella; Putri Lynna A. Luthan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 2, No 2 (2019): July 2019
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v2i2.13996

Abstract

Water hyacinth is aquatic weed plant that has medium fiber content with length about 1.75 – 2.12 mm and diameter about 11.15 – 11.65 μm in its stem. Water hyacinth contains 90% of water by weight reduction from 10 Kg when wet to 1 Kg when dry. In dry conditions, water hyacinth contains crude protein 13.03%, crude fiber 20.6%, fat 1.1%, ash 23.8% and the rest is vortex that contains polysaccharides and minerals. Research was done to obtain the design of heat absorbing product that modified with additional of water hyacinth. The method that was uesd begin with drying water hyacinth to obtain good fiber. water hyacinth fibers then mixed with cement and sand which are made as composites in order to reduce the heat of room. The result of the research is make a product that can overcome thermal comfort problems in deep room temperature condition. Water hyacinth was chosen because it is easy to obtain, cheap and can reduce environmental pollution (biodegradability) so that the composite can overcome environment ptoblem and its used doesn’t endanger health. Based on the test result by providing a heat source of 40 Watt bulb lamp to the media for 15 minutes, it was found that the final temperature of the media 1 without additional of water hyacinth fiber was 32.5oC, final temperature of media 2 with additional of 100 gr water hyacinth was 32.2oC, and the final temperature of media 3 with additional 150 gr water hyacinth was 31.7oC. it shows heat temperature that is released and cannot be absorbed by composite in media 3 is only 0.50C, in meida 2 is only 10C while in composite in media 1 without additional of water hyacinth fiber that release heat about 1.3oC. it shows that the product is suitable to use because composite with additional of water hyacinth can absorb heat and release less heat compared to composite without additional water hyacinth fiber so that the room become cooler.

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