Subjects -> CHEMISTRY (Total: 928 journals)
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CHEMISTRY (661 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal  
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 30)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 8)
ACS Catalysis     Hybrid Journal   (Followers: 52)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 23)
ACS Combinatorial Science     Hybrid Journal   (Followers: 21)
ACS Environmental Au     Open Access   (Followers: 9)
ACS Macro Letters     Hybrid Journal   (Followers: 25)
ACS Materials Letters     Open Access   (Followers: 2)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 42)
ACS Nano     Hybrid Journal   (Followers: 182)
ACS Photonics     Hybrid Journal   (Followers: 14)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 30)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 8)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 7)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Adsorption Science & Technology     Open Access   (Followers: 7)
Advanced Electronic Materials     Hybrid Journal   (Followers: 7)
Advanced Functional Materials     Hybrid Journal   (Followers: 71)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 3)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 6)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 109)
Advances in Chemical Science     Open Access   (Followers: 51)
Advances in Chemistry     Open Access   (Followers: 34)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Environmental Chemistry     Open Access   (Followers: 11)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 33)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 51)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Sample Preparation     Open Access   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 16)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Chemical Education     Open Access   (Followers: 5)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access   (Followers: 2)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 4)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 43)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 19)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 9)
Analyst     Hybrid Journal   (Followers: 35)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 152)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 229)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 24)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access  
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 201)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 23)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 90)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 66)
Bioorganic Chemistry     Hybrid Journal   (Followers: 9)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 1)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 12)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Carbohydrate Research     Hybrid Journal   (Followers: 24)
Carbon     Hybrid Journal   (Followers: 65)
Carbon Capture Science & Technology     Open Access  
Carbon Trends     Open Access   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 9)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 11)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal  
Chem Catalysis     Hybrid Journal  
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 81)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Physics Impact     Full-text available via subscription  
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 169)
Chemical Science     Open Access   (Followers: 39)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 75)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 2)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 54)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 22)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 121)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 19)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 6)
Chemistry Education Review     Open Access   (Followers: 1)
Chemistry in Education     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 162)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription  
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
Clay Minerals     Hybrid Journal   (Followers: 8)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 6)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comptes Rendus : Chimie     Open Access  
Comptes Rendus : Physique     Open Access   (Followers: 2)

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Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2302-7274
Published by Universitas Udayana Homepage  [62 journals]
  • PENGARUH PENAMBAHAN KAOLIN TERAKTIVASI ASAM TERHADAP KONDUKTIVITAS MEMBRAN
           KITOSAN/LIClO4 UNTUK APLIKASI BATERAI LITIUM

    • Authors: Megawati Ayu Putri, Nadia Nadia, Mimi Mawaddah, Nurhadini Nurhadini
      Pages: 50 - 57
      Abstract: ABSTRAK: Polimer elektrolit kitosan/LiClO4/kaolin dengan variasi komposisi LiClO4 dan kaolin teraktivasi asam telah dipreparasi menggunakan metode casting, larutan polimer dalam wadah akrilik yang didahului dengan ektraksi kitosan dari kulit udang. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan kaolin teraktivasi asam terhadap konduktivitas polimer elektrolit kitosan/LiClO4/kaolin. Berdasarkan hasil FTIR, kitosan kulit udang menunjukkan adanya gugus fungsi -OH yang tumpang tindih dengan NH2, C-H, C=O, C-O, C-O (C-O-C) serta '-1,4-glikosidik. Selain itu, didapatkan derajat deasetilasi sebesar 87,28% dan rendemen kitosan sebesar 6,54%. Hasil uji konduktivitas menunjukkan konduktivitas terbesar pada komposisi LiClO4 20% dengan nilai konduktivitas  dan  berturut-turut yaitu 4,40 x10-4 S/cm dan 10-4 S/cm. Nilai konduktivitas  dan  pada membran kitosan/LiClO4 yang diperoleh telah memenuhi standar konduktivitas membran polimer untuk aplikasi baterai ion litium yaitu kisaran 10-7 S/cm – 10-3 S/cm.   ABSTRACT: Chitosan/LiClO4/kaolin electrolyte polymers with various compositions of LiClO4 and acid-activated kaolin have been prepared using the polymer solution casting method in an acrylic container which was preceded by the extraction of chitosan from shrimp shells. This study aims to analyze the effect of the addition of acid activated kaolin on the conductivity of the chitosan/LiClO4/kaolin electrolyte polymer. Based on the results of the FTIR of shrimp shell chitosan, it showed that the -OH functional group overlapped with NH2, C-H, C=O, C-O, C-O (C-O-C) and '-1,4-glycosidic. In addition, the degree of deacetylation was 87.28% and the chitosan yield was 6.54%. The conductivity test results show the highest conductivity at 20% LiClO4 composition with conductivity values '' and respectively, namely 4.40 x10-4 S/cm and 10-4 S/cm Conductivity values ) and on the chitosan/LiClO4 membrane obtained have met the polymer membrane conductivity standard for lithium ion battery applications, which is in the range of 10-7 S/cm – 10-3 S/cm.  
      PubDate: 2022-01-29
      Issue No: Vol. 9, No. 2 (2022)
       
  • KANDUNGAN LOGAM Pb DAN Cu DALAM TANAMAN BAYAM DAN BIOAVAILABILITASNYA
           DALAM TANAH PERTANIAN DENGAN PEMBERIAN PUPUK NPK

    • Authors: Ni Made Dwita Prasetyawati, I Made Siaka, Wiwik Susanah Rita
      Pages: 58 - 67
      Abstract: ABSTRAK: Pencemaran logam berat pada tanah pertanian akibat penggunaan pupuk anorganik seperti pupuk NPK dapat berdampak pada kandungan logam berat dalam tanaman hasil pertanian. Penelitian ini bertujuan untuk mengetahui kandungan logam Pb dan Cu dalam tanaman bayam dan tingkat bioavailabilitas logam tersebut dalam tanah pertanian dengan pemberian pupuk NPK. Metode yang diterapkan pada penelitian ini adalah digesti basah untuk menetapkan logam berat total dan ekstraksi bertahap untuk spesiasi dan menentukan bioavailabilitas logam berat tersebut. Kuantifikasi Pb dan Cu dilakukan dengan menggunakan alat Atomic Absorption Spectrofotometer (AAS) dengan metode kurva kalibrasi dan adisi standar. Pada penelitian ini ditemukan bahwa kandungan logam Pb dan Cu pada tanaman bayam mengalami peningkatan berturut-turut dari 59,7617 dan 14,0713 mg/kg untuk tanaman tanpa pupuk NPK menjadi 80,2736 dan 21,5550 mg/kg pada tanaman dengan pemberian pupuk NPK. Penggunaan pupuk NPK pada tanah pertanian juga dapat meningkatkan logam yang bioavailable sebesar 0,83% untuk Pb dan 2,70% untuk Cu. Dengan demikian, pemberian pupuk NPK pada tanah pertanian dapat menyebabkan peningkatan bioavailabilitas Pb dan Cu dalam tanah dan kandungannya dalam tanaman bayam.   ABSTRACT: Heavy metal contamination in agricultural soil due to the use of inorganic fertilizers such as NPK fertilizer could have an impact on heavy metal content in agricultural products. This study aimed to determine the metal content of Pb and Cu in spinach and the level of bioavailability of these metals in agricultural soils treated with NPK fertilizer. The methods applied in this study were wet digestion and sequential extraction for determining the total metals of Pb and Cu, as well as the bioavailability of these metals. The measurement and quantification of the metals were performed by the use of an Atomic Absorption Spectrophotometer (AAS) with applying calibration curve and standard addition techniques. In this study, it was found that the metal contents of Pb and Cu in spinach plants increased from 59,7617 and 14,0713 mg/kg, respectively for plants without NPK fertilizer to 80,2736 and 21,5550 mg/kg in plants with NPK fertilizer application. The use of NPK fertilizer on agricultural soils could also increase the bioavailable metal by 0,83% for Pb and 2,70% for Cu. Therefore, the application of NPK fertilizer to the agricultural soils could increase the bioavailability of Pb and Cu in the soil and their content in the spinach plants.
      PubDate: 2021-10-30
      Issue No: Vol. 9, No. 2 (2021)
       
  • UJI AKTIVITAS EKSTRAK METANOL DAUN KEBIUL (Caesalpinia bonduc L.) SEBAGAI
           BAHAN AKTIF SEDIAAN TABIR SURYA

    • Authors: Novita Sari, Dwi Fitri Yani
      Pages: 68 - 74
      Abstract: ABSTRAK: Penelitian ini bertujuan untuk  menentukan aktivitas tabir surya dari nilai SPF (Sun Protection Factor) Aktivitas tabir surya ditentukan dengan Penentuan SPF dilakukan dengan metode Spektrofotometri Uv-Vis. Kandungan senyawa kimia ditentkan dengan uji fitokimia. Hasil penelitian menunjukkan bahwa nilai SPF yang diperoleh dari konsentrasi  200, 400, 600, 800, dan 1000 ppm berturut-turut yaitu sebesar 2,4 (proteksi minimal); 4,7 (proteksi sedang); 7,8 (proteksi ekstra); 9,2 (proteksi maksimal) dan 11,3 (proteksi maksimal). Berdasarkan uji fitokimia, ekstrak metanol daun kebiul positif mengandung flavonoid, tanin, steroid, dan saponin.   ABSTRACT: This study aims to determine the activity of sunscreen from the value of SPF (Sun Protection Factor). Sunscreen activity was determined by determining the SPF using the Uv-Vis Spectrophotometry method. The content of chemical compounds is determined by phytochemical tests. The results showed that the SPF values obtained from concentrations of 200, 400, 600, 800, and 1000 ppm were 2.4 (minimum protection); 4.7 (moderate protection); 7.8 (extra protection); 9.2 (maximum protection) and 11.3 (maximum protection). Based on the phytochemical test, the methanol extract of kebiul leaves was positive for flavonoids, tannins, steroids, and saponins
      PubDate: 2021-10-30
      Issue No: Vol. 9, No. 2 (2021)
       
  • BIOSINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK AIR DAUN CEMMEM
           (Spondias pinnata (L.f) Kurz.) DAN AKTIVITASNYA SEBBAI ANTIBAKTERI

    • Authors: Gusti Ayu Putu Prima Purnamasari, Gusti Ayu Dewi Lestari, Kadek Duwi Cahyadi, Ni Ketut Esati, Iryanti Eka Suprihatin
      Pages: 75 - 80
      Abstract: ABSTRAK: Nanopartikel perak (NPAg) dibuat dengan metode green synthesis dengan memanfaatkan bahan alam sebagai bioreduktor, seperti daun cemcem. Tujuan dari penelitian ini yaitu memanfaatkan ekstrak air daun cemcem (Spondias pinnata (L.f) Kurz.) sebagai bioreduktor untuk pembentukan nanopartikel perak dan menguji aktivitasnya sebagai antibakteri. Proses ini dimulai dengan mencampur ekstrak konsentrasi 0,5; 0,75; dan 1% dengan larutan 1 mM AgNO3 dengan perbandingan 1:10. Campuran dipanaskan dengan suhu 25; 40; dan 60°C. NPAg dikarakterisasi dengan spektrofotometer UV-Vis dimana hasil menunjukkan bahwa panjang gelombang NPAg antara 416 – 435 nm. Hasil PSA menunjukkan bahwa penggunaan ekstrak dengan konsentrasi 0,5% dengan suhu 60°C menghasilkan partikel dengan ukuran yang paling kecil yaitu sebesar 30,56 ± 0,24 nm. Pengujian antibakteri menunjukkan bahwa NPAg memiliki daya hambat yang tergolong sedang (6-10 mm).   ABSTRACT: Silver nanoparticles (AgNPs) are made by green synthesis method by utilizing natural materials as bioreductants, such as cemcem leaves. The purpose of this study were to utilize the aqueous extract of the leaves of cemcem (Spondias pinnata (L.f) Kurz.) as a bioreductor for the formation of silver nanoparticles and to test its antibacterial activity. This process is started by mixing the extract concentration 0.5; 0.75; and 1% with 1 mM AgNO3 solution with a ratio of 1:10. The mixture was heated at temperature of 25; 40; and 60°C. AgNPs were characterized using a UV-Vis spectrophotometer where the results showed that the AgNPs wavelength was between 416 – 435 nm. The PSA results showed that the use of extracts with a concentration of 0.5% at a temperature of 60°C produced particles with the smallest size of 30.56 ± 0,24 nm. Antibacterial testing showed that AgNPs had moderate inhibitory power (6-10 mm).
      PubDate: 2021-10-30
      Issue No: Vol. 9, No. 2 (2021)
       
  • MODIFIKASI STRUKTUR TRIASILGLISERIDA DARI MINYAK KOPRA MENGGUNAKAN VARIASI
           WAKTU OKSIDASI KMnO4 UNTUK PRODUKSI BIODIESEL

    • Authors: Dyah Wulandhari Sulthan, Aisyah Aisyah, Suriani Suriani, Arfiani Nur, Ummi Zahra
      Pages: 81 - 90
      Abstract: ABSTRAK: Biodiesel merupakan salah satu bahan bakar alternatif yang ramah lingkungan sebagai pengganti solar. Namun, biodiesel memiliki kelemahan yaitu titik awan yang tinggi sehingga biodiesel akan merusak mesin diesel jika digunakan di daerah yang beriklim dingin. Titik awan yang tinggi disebabkan karena adanya asam lemak tidak jenuh dari minyak (triasilgliserida). Penelitian ini bertujuan untuk memproduksi biodiesel dari bahan baku minyak kopra dengan memodifikasi struktur triasilgliseridanya. Metode yang dilakukan yaitu melakukan modifikasi terlebih dahulu pada triasilgliserida dengan reaksi oksidasi KMnO4 3% serta katalis H2SO4 6N dengan variasi waktu 30, 45, 60, 75 dan 90 menit dan dilanjutkan proses transesterifikasi untuk produksi biodiesel menggunakan pelarut metanol. Hasil nilai konversi biodiesel yang didapatkan pada masing-masing variasi yaitu 6,61 %, 13,16%, 50,36%, 39,30% dan 7,98%. Hal tersebut menunjukkan bahwa biodiesel dari hasil modifikasi triasilgliserida lebih sedikit rendamennya. Biodiesel yang diperoleh diidentifikasi dengan menggunakan instrumen IR dan GC-MS. Komponen- komponen hasil spektrum IR yang dihasilkan dari kelima variasi menunjukkan data- data spektrum yang hampir sama dengan GC-MS yang menunjukkan adanya komponen mayor diduga yaitu metil ester seperti metil palmitat, metil stearat, metil laurat dan metil kaprat. Selain itu, juga diduga adanya senyawa epoksi yaitu cis-9- metil, 10-epoksioktadekanoat sebagai komponen minor.   ABSTRACT: Biodiesel is one of the alternative fuels that are environmentally friendly as a substitute for diesel fuel. However, biodiesel has the disadvantage of a high cloud point so that biodiesel will damage the diesel engine if used in areas with cold climates. High cloud points due to the unsaturated fatty acids from oils (triacylgliciride). This study aims to produce biodiesel from raw material copra oil by modifying the structure of triacylgliciride. The method to do that is to make modifications prior to the oxidation reaction of triacylglycerides with KMnO4 3% and H2SO4 6N as a catalyst with a variation of 30, 45, 60, 75 and 90 minutes and proceed transesterification process to produce biodiesel using methanol. Results biodiesel conversion value was obtained in each variation is 6.61%, 13.16%, 50.36%, 39.30% and 7.98%. It was show that biodiesel from modified triacylgliciride less yield. Biodiesel was obtained using instruments identified by IR and GC-MS. The components of the IR spectrum were result generated from the fifth variation of the data showed a spectrum similar to GC-MS which showed major components, namely allegedly methyl esters such as methyl palmitate, methyl stearate, methyl laurate and methyl caprate. In addition, also alleged the existence of an epoxy compound that is cis-9- methyl, 10-epoxyoktadecanoate as a minor component.
      PubDate: 2021-10-30
      Issue No: Vol. 9, No. 2 (2021)
       
  • KANDUNGAN TOTAL LOGAM Pb DALAM AIR DAN SEDIMEN SERTA BIOAVAILABILITASNYA
           DI PANTAI KEDONGANAN BALI

    • Authors: Ni Gusti Ayu Made Dwi Adhi Suastuti, irdhawati Irdhawati, Nadya Sarilla Agatha
      Pages: 91 - 99
      Abstract: ABSTRAK: Pencemaran yang diakibatkan oleh logam berat dalam air laut dan sedimen sangat penting untuk diperhatikan karena dapat merusak lingkungan perairan dalam bentuk penurunan kualitas ekosistem.  Tujuan penelitian ini untuk mengetahui kandungan total logam Pb dalam air dan sedimen serta bioavailabilitasnya di Pantai Kedonganan Bali. Penentuan kandungan logam Pb dalam air laut dan sedimen menggunakan Spektrofotometer Serapan Atom. Penentuan spesiasi logam Pb dalam sedimen dilakukan ekstraksi bertahap dan kandungan logamnya diukur menggunakan SSA. Konsentrasi logam Pb total dalam air laut adalah antara 0,2630-1,2642 mg/L pada tiga lokasi yang berbeda. Menurut Keputusan Kementerian Negara Lingkungan Hidup No.51 tahun 2004 tentang Baku Mutu Air Laut, keberadaan logam Pb di perairan sudah melewati ambang batas sebesar 0,05 mg/L. Konsentrasi logam Pb dalam sedimen sebesar 541,7 mg/kg. Berdasarkan pedoman mutu Australian and New Zealand Environment and Conservation Council (ANZECC) tahun 2000, konsentrasi logam Pb dalam sedimen sudah melewati nilai ambang batas yang telah ditentukan sebesar 50-220 mg/kg. Bioavailabilitas logam Pb didominasi oleh logam yang sifatnya berpotensi bioavailabel (46,42-53,58%), kemudian yang sifatnya non bioavailabel (37,92-39,46%), dan yang paling kecil adalah logam yang bersifat bioavailabel (7,36-15,35%).   ABSTRACT: Monitoring of heavy metal pollution in seawater and sediment is very important because it can damage the aquatic environment in the form of decreasing ecosystem quality. The purpose of this study was to determine the total content of Pb in water and sediment in Kedonganan Beach Bali, and their bioavailability. Determination of Pb content in seawater and sediment has been done using Atomic Absorption Spectrophotometer (AAS). The speciation of Pb in sediments was carried out by stepwise extraction, then the Pb content was measured using AAS. The concentrations of total Pb in seawater from three different locations were between 0,2630-1,2642 mg/L. According to the Decree of the State Ministry of the Environment No. 51/2004 concerning Sea Water Quality Standards, the threshold for Pb in water over than acceptable value of 0.05 mg/L. The total concentration of Pb in the sediment was 541.7 mg/kg. Based on the quality guidelines of the Australian and New Zealand Environment and Conservation Council (ANZECC) 2000, the concentration of Pb was more than threshold value of 50-220 mg/kg. The potential bioavailability of Pb in sediment was 46.42-53.58%, followed by non-bioavailability at 37.92-39.46%, and bioavailable 7.36-15.35%.
      PubDate: 2021-10-30
      Issue No: Vol. 9, No. 2 (2021)
       
 
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