Publisher: UIN Maulana Malik Ibrahim Malang   (Total: 14 journals)   [Sort by number of followers]

Showing 1 - 14 of 14 Journals sorted alphabetically
Alchemy : J. of Chemistry     Open Access   (Followers: 4)
De Jure: Jurnal Hukum dan Syar'iah     Open Access   (Followers: 4)
El-Harakah     Open Access   (Followers: 2)
el-Hayah     Open Access  
El-Hikmah     Open Access   (Followers: 2, SJR: 0.102, CiteScore: 0)
EL-MUHASABA     Open Access   (Followers: 1)
J. of Islamic Architecture     Open Access   (Followers: 11)
Jurisdictie Jurnal Hukum dan Syariah     Open Access   (Followers: 1)
Jurnal NEUTRINO     Open Access  
LiNGUA : Jurnal Ilmu Bahasa dan Sastra     Open Access   (Followers: 2)
MADARASAH Jurnal Pendidikan dan Pembelajaran Dasar     Open Access   (Followers: 1)
MATICS     Open Access   (Followers: 2)
SAINSTIS     Open Access   (Followers: 1)
Ulul Albab     Open Access   (Followers: 3)
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Alchemy : Journal of Chemistry
Number of Followers: 4  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2086-1710 - ISSN (Online) 2086-1710
Published by UIN Maulana Malik Ibrahim Malang Homepage  [14 journals]
  • Distribusi Spasial Logam Berat Besi (Fe) di Perairan Teluk Staring,
           Sulawesi Tenggara

    • Authors: Bahril Bahril, Armid Armid, Jabir Jabir, Amadhan Takwir, Abdul Rahim
      Pages: 30 - 39
      Abstract:  Study on spatial distribution of metal Fe in the coastal area of Staring Bay, Southeast Sulawesi has been carried out. This study aims to determine the spatial distributions of heavy Fe in the coastal area of Staring Bay. Sampling was conducted at 12 stations along the bay through the purposive sampling method. Determination of heavy metal Fe concentration was performed utilizing the Atomic Absorption Spectrophotometry (AAS). Spatial analysis was performed with IDW interpolation method using a software ArcGIS 10.3. The results showed that the concentration of metal Fe at 12 stations was in the range of 0.00187 ppm to 0.01296 ppm whereby the highest level was found at station 7 (mouth of the Laonti river). The spatial analysis in 12 stations confirmed that in the coastal areas of Woru-woru village (near the mouth of the Laonti river) to Gala Island and Wandahea village up to Intan Island have been contaminated by metal Fe ranged from 0.0106-0.0117 ppm and 0.0118-0.013 ppm, respectively. The contamination factor of metal Fe was moderate. Based on the values of CF, the highest contamination of heavy metal Fe is at station 7. Keywords: Spatial analysis, Fe, IDW, CF, Staring Bay  Telah dilakukan studi distribusi spasial logam Fe di perairan Teluk Staring, Sulawesi Tenggara. Penelitian ini bertujuan untuk menentukan sebaran spasial logam Fe di perairan Teluk Staring. Pengambilan sampel dilakukan 12 stasiun di perairan teluk dengan metode purposive sampling. Penentuan kadar logam Fe pada sampel air laut menggunakan Atomic Absorption Spectrophotometry (AAS). Analisis spasial dilakukan dengan metode interpolasi IDW menggunakan software ArcGIS 10.3. Hasil penelitian menunjukkan bahwa kadar logam Fe di 12 stasiun penelitian berkisar antara 0,00187-0,01296 ppm dengan kadar tertinggi berada pada stasiun 7 (muara Sungai Laonti). Hasil analisis spasial pada 12 stasiun menunjukkan bahwa di daerah pesisir Desa Woru-woru (dekat muara Sungai Laonti) hingga Pulau Gala dan Desa Wandahea hingga Pulau Intan telah terkontaminasi logam Fe dengan kisaran 0,0106-0,0117 ppm dan 0,0118-0,013 ppm. Faktor kontaminasi logam Fe bersifat moderat. Berdasarkan nilai CF, kontaminasi tertinggi oleh logam Fe terdapat pada stasiun 7. Kata kunci: Analisis spasial, Fe, IDW, CF, Teluk Staring 
      PubDate: 2019-12-05
      DOI: 10.18860/al.v7i2.7192
      Issue No: Vol. 7, No. 2 (2019)
  • Sintesis Pigmen Geothit (α-FeOOH) dari Limbah Industri Kerajinan Besi
           dengan Metode Presipitasi

    • Authors: Choirun Nisa, Nur Aini, Lilik Miftahul Khoiroh
      Pages: 40 - 45
      Abstract: Iron handicraft is one of industries that process iron ore into handicraft products and produce lathe waste. Iron lathe contains 96.08% iron metal which is potential source as a precursor for synthesis of goethite pigment. The method used for synthesis was precipitation using NaHCO3 as precipitator agent. Synthesis was conducted at 70°C with variations of stirring speed such as 550, 650, 750 and 850 rpm. The products were characterized by color reader, ultraviolet-visible (UV-Vis) spectroscopy, XRD and SEM-EDX. The data from color reader showed that the highest yellowness degree and lightness obtained at a stirring speed 550 rpm were 24.1 and 42.1, respectively. UV-Vis data showed that the maximum wavelength of goethite pigment was 600-624 nm. Based on XRD data, synthesized pigment was in goethite phase (α-FeOOH) for all samples with crystallite size 63.24 nm and the highest crystallinity was achieved at 550 rpm. SEM-EDX data showed that morphology pigment (α-FeOOH) was not uniform, there were impurities such as Na and C. Keywords: Lathe waste, precipitation, goethite, pigment  Industri kerajinan besi merupakan salah satu industri yang mengolah bijih besi menjadi produk kerajinan dan menghasilkan limbah bubut besi. Limbah bubut besi mengandung unsur besi sebesar 96,08% yang berpotensi sebagai bahan baku (prekursor) untuk sintesis pigmen geothit. Metode yang digunakan adalah metode presipitasi dengan agen pengendap NaHCO3. Sintesis dilakukan pada suhu 70°C dengan variasi kecepatan pengadukan 550, 650, 750 dan 850 rpm. Produk hasil sintesis dikarakterisasi dengan color reader, spektroskopi ultraviolet-tampak (UV-Vis), XRD, dan SEM-EDX. Data color reader menunjukkan bahwa derajat kekuningan dan derajat kecerahan tertinggi didapatkan pada kecepatan pengadukan 550 rpm yaitu berturut-turut 24,1 dan 42,1. Data UV-Vis menunjukkan panjang gelombang maksimum pigmen geothit hasil sintesis adalah 600-624 nm. Hasil karakterisasi XRD menunjukkan bahwa pigmen hasil sintesis pada semua kecepatan pengadukan berfasa geothit (α-FeOOH) dengan derajat kristalinitas tertinggi pada kecepatan pengadukan 550 rpm dengan ukuran kristal 63,24 nm. Hasil SEM-EDX pada kecepatan 550 rpm menunjukkan bahwa morfologi pigmen (α-FeOOH) hasil sintesis tidak seragam dan ditemukan adanya pengotor berupa unsur Na dan C. Kata kunci: Limbah bubut besi, presipitasi, geothit, pigmen
      PubDate: 2019-12-05
      DOI: 10.18860/al.v7i2.4928
      Issue No: Vol. 7, No. 2 (2019)
  • Conversion of Crude Glycerol from by-Product Biodiesel into Bio-additive
           of Fuel through Acetylation Reaction based on Modified Zeolite Catalyst

    • Authors: Heny Dewajani, Windi Zamrudy, Hadi Saroso, Satria Paramarta, Wahyudianto Mulya
      Pages: 46 - 52
      Abstract: Biodiesel is one of the alternative fuels produced from the transesterification reaction between triglycerides and alcohols with glycerol by-products. So far, the resulting crude glycerol has not been maximally utilized because of its low purity. So, it is necessary to purify glycerol before turning it into a more useful compound. The purified glycerol can be reacted with acetic acid within esterification reaction (acetylation process) using an acid catalyst to produce glycerol triacetate (triacetin). One of the uses of triacetin as an additive in gasoline and biodiesel. The purpose of this study is to utilize glycerol from by-products from biodiesel production to bio-additive materials that can improve fuel quality and are environmentally friendly. The method used in this study begins with the purification of crude glycerol, modification of zeolite catalyst with impregnated of nickel metal followed by an acetylation reaction which held on temperature of 100°C for 60 min. The experimental results are analyzed using base titration to determine the remaining unreacted acids and are applied as bio-additives by adding them to commercial fuels and measured the increasing octane numbers. The result shows that the reaction conversion increases with increasing mole ratio of reactants and catalysts with the best results in the mole ratio of acetic acid and glycerol is 9:1 and catalyst 5% by weight of acetic acid with a conversion of 66.02%. As bio-additives the reaction product could increase the octane number of commercial fuel by 6.5 up to 8.5%. Keywords: glycerol, acetylation reaction, mofified zeolite, bio-additive
      PubDate: 2019-12-05
      DOI: 10.18860/al.v7i2.8193
      Issue No: Vol. 7, No. 2 (2019)
  • Korelasi Kadar Karboksihemoglobin terhadap Tekanan Darah Penduduk di
           Sekitar Terminal Bus Tirtonadi Surakarta

    • Authors: Wimpy Wimpy, Tri Harningsih
      Pages: 53 - 57
      Abstract:  Carbon monoxide is a gas from incomplete combustion of fuel containing carbon. In high concentration on the blood stream, carbon monoxide is able to cause death. The affinity of hemoglobin for carbon monoxide is higher than that of oxygen. Blood clotting because of high concentration carbon monoxide in the blood can increase blood viscosity and causes vasoconstriction. This study aims to determine the correlation between carboxyhaemoglobin (COHb) and blood pressure of the resident living around Tirtonadi Bus Station, Surakarta. The concentration of COHb was analyzed using UV-Vis Spectrophotometer. The COHb concentration of A1, A2, A3, A4, A5, A6, A7, A8, A9, A10 samples was 6.51, 6.28, 6.22, 6.23, 6.21, 6.17, 6.17, 6.11, 6.15, and 6.12%, respectively. The result of the test was analyzed by SPSS. The result of normality test does not show normal distribution data. Statistical analysis was conducted by using Spearman. There is a significant value of systole (0.027) and diastole (0.011). There is a correlation between COHb concentration and blood pressure of the resident living around Tirtonadi Bus Station, Surakarta. Keywords: Carboxyhaemoglobin, blood pressure, Tirtonadi bus station  Karbon monoksida adalah gas polutan yang berasal dari produk pembakaran yang tidak sempurna dari bahan bakar yang mengandung karbon. Pada konsentrasi tinggi dalam darah, gas ini dapat menyebabkan kematian. Afinitas karbon monoksida lebih besar dari pada dengan oksigen. Kadar karbon monoksida yang tinggi di dalam aliran darah akan membentuk bekuan darah sehingga akan meningkatkan kekentalan darah. Hal ini dapat menyebabkan terjadinya vasokonstriksi sehingga akan menaikan tekanan darah. Tujuan penelitian ini untuk mencari hubungan antara kadar karboksihemoglobin (COHb) terhadap tekanan darah penduduk yang tinggal di sekitar Stasiun Bus Tirtonadi, Surakarta. Pengukuran kadar COHb menggunakan Spektrofotometer UV-Vis. Hasil uji kadar COHb pada kode sampel A1, A2, A3, A4, A5, A6, A7, A8, A9, dan A10 masing-masing sebesar 6,51; 6,28; 6,22; 6,23; 6,21; 6,17; 6,17; 6,11; 6,15 dan 6,12%. Hasil data dianalisis dengan SPSS. Hasil uji normalitas tidak menunjukkan data distribusi normal. Pengukuran statistik dilakukan dengan menggunakan uji Spearman. Hasil penelitian menunjukkan nilai signifikan sistol sebesar 0,027 dan diastol sebesar 0,011. Ada korelasi antara kadar COHb dengan tekanan darah pada penduduk yang tinggal di sekitar Terminal Tirtonadi, Surakarta. Kata kunci: Karboksihemoglobin, tekanan darah, Terminal Tirtonadi 

      PubDate: 2019-12-05
      DOI: 10.18860/al.v7i2.7772
      Issue No: Vol. 7, No. 2 (2019)
  • Influence of Biodiesel Waste Cooking Oil on Produce Hydrocarbon Fraction
           by Catalytic Cracking Waste Polystyrene and its Application in Gasoline

    • Authors: Hendro Juwono, Ardita Elliyanti, Firman Satria Pamungkas, Anas Assari, Ahmad Hawky Dermawan, Arifah Nurfitriyah
      Pages: 58 - 63
      Abstract: Liquid fuel from polystyrene waste and waste cooking oil biodiesel was successfully obtained through catalytic cracking using Al-MCM-41/Ceramic. The structure, morphology, acidity, and porosity of the catalyst were studied by SEM-EDX, pyridine FTIR, and N2 gas adsorption-desorption. The products of catalytic cracking were analyzed using gas chromatogram-mass spectroscopy (GC-MS). The highest yield was obtained at feedstock variations of 57% (P): 43% (M) with the number of hydrocarbon fractions (< C7) is 0.48%, hydrocarbon fraction (C8 - C12) is 20.99%, and hydrocarbon fraction (> C12) is 78.53% in the cracking time 1 hours. Physical characteristics were reported in the form of density, flash point, and caloric value respective. The performance of liquid fuels with commercial fuels, Premium (RON 88), and additives of methyl tertiary butyl ether (MTBE) comparisons of 225 (mL): 750 (mL): 18.25 (mL) respectively produce thermal efficiency on engine use gasoline generator sets was 28.22% at the load of 2118 Watts. Based on this research, all variations of feedstock produce liquid fuels that are in accordance with SNI 06-3506-1994 concerning the quality of gasoline fuel types. Keywords: Catalytic cracking, polystyrene waste, waste cooking oil, liquid fuel
      PubDate: 2019-10-30
      DOI: 10.18860/al.v7i2.8546
      Issue No: Vol. 7, No. 2 (2019)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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