JURNAL SAINS NATURAL最新文献

{"title":"KUALITAS AIR SUMUR MASYARAKAT DI SEKITAR TEMPAT PEMBUANGAN AKHIR SAMPAH (TPAS) RAWA KUCING KOTA TANGERANG","authors":"Wahyuni Wahyuni, Supriyono Eko Wardoyo, Ridha Arizal","doi":"10.31938/JSN.V7I2.256","DOIUrl":"https://doi.org/10.31938/JSN.V7I2.256","url":null,"abstract":"The Quality of Well Water around Final Garbage Dump (FGD)  Rawa Kucing, Tangerang, IndonesiaFGD Rawa Kucing is located at Sultan Iskandar Muda Street, Kedaung Wetan, Neglasari, Tangerang, Banten, Indonesia. It serves 1000 tons of garbage per day from 13 districts in Tangerang. The volume of garbage in Kota Tangerang increases from 1,212,264 m3 in 2008 to 4,590,724 m3in 2012.Well water is the main source of water for people around the FGD RawaKucing. They use well water for bath, wash,  and toilet (BWT) and other needs. Garbage decomposition which makes pollution around FGD Rawa Kucing can accur in air, water, and soil. Waste accurs in water and soil caused by leachate. Leachate can easily  spread through rainwater runoff and it absorbs to the ground and polluting it including well water around it. Contaminated well water can decrease the quality of water physically, chemically, and microbiologically.Groundwater samples taken from residents' well water around FGD Rawa Kucing  and they were represented by three groups which have distance 100 m - 3 km from FGD. Each group consisted of three samples which were taken from well water having depths between 8-18 m. The examination of the quality of well water should be made in accordance with the Regulation of the Minister of Health of the Republic of Indonesia No.416/MENKE /PER/IX/1990 on the Conditions and Control of the Quality of Clean Water and Quality Regulation of the Minister of Health of the Republic of Indonesia No. 492/MENKES/PER/IV/ on Requirements and Quality Control of Drinking Water.The quality of well water around FGD Rawa Kucing showed that there were the decreased quality water after testing with several parameter tests. There were six examination parameters which concentrate on exceeding the required quality standards that of TDS (1600-1764 mg/L), Nitrates (10.5-37.8 mg/L), Ammonia (3.50-66.21 mg/L), Iron (1.054-7.063 mg/L), Manganese (1.085-10.130 mg/L), and Total Coliform (80-130 colonies/100 mL).Keywords : Well water, leachate, TPAS, pollution, water qualityABSTRAKTPAS Rawa Kucing berada di Jalan Sultan Iskandar Muda Kelurahan Kedaung Wetan, Kecamatan Neglasari, Kota Tangerang, Banten dan mengangkut 1000 ton sampah/hari dari 13 kecamatan.Volume sampah di Kota Tangerang terus meningkat dari tahun 2008 sebesar 1.212.264 m3 sampai pada tahun 2012 telah mencapai 4.590.724 m3. Air sumur merupakan sumber air utama bagi masyarakat sekitar TPAS, karena hampir semua kebutuhan air dipenuhi dari air sumur yaitu untuk Mandi Cuci Kakus (MCK) dan kebutuhan lainnya. Pencemaran akibat dekomposisi sampah dapat terjadi di udara, dapat pula terjadi pada air dan tanah yang disebabkan oleh adanya rembesan air lindi. Lindi tersebut mudah disebarkan melalui limpasan air hujan dan meresap mencemari air tanah termasukair sumur yang ada di sekitarnya. Air sumur yang terkontaminasi lindi berakibat terjadinya penurunan kualitas air secara fisik, kimia, dan mikrobiologi. Air tanah sampelyang diambil berasal dar","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80389138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PERBANDINGAN LAJU KOROSI PADA MATERIAL STEEL PLATE COLD COIL (SPCC) YANG DILAPISI CAT DENGAN RESIN YANG BERBEDA","authors":"Winda Yulliyanti, Devy Susanty, W. Wahyono","doi":"10.31938/JSN.V6I1.251","DOIUrl":"https://doi.org/10.31938/JSN.V6I1.251","url":null,"abstract":"Comparison of Corrosion Rate on Steel Plate Cold Coil (Spcc) Material Coated With Different ResinIron corrosion is the most prominent problem because iron is widely used as a material, for example Steel Plate Cold Coil (SPCC) material or rolled steel plate that undergoes cooling process. SPCC materials are generally used for the manufacture of automobile engines, motor equipment, building construction, battery boxes, industrial machinery, and so on. The corrosion rate was determined by the salt blowing method. This method aims to calculate the corrosion rate of the material acting on an environment containing a salt solution such as NaCl. Corrosion rate testing was done on three types of paint (paint A, paint B, and C paint). Based on analysis and observation results, Coated Steel Plate Cold Coil material B coated has the smallest corrosion rate value because B paint has epoxy resin in the presence of aromatic aromatic compound ether, aromatic hydrocarbon and aliphatic alcohol.Keywords: Iron, Steel Plate Cold Coil (SPCC), corrosion, paint ABSTRAK Korosi pada besi merupakan masalah yang paling menonjol karena besi banyak digunakan secara luas sebagai material, contohnya material Steel Plate Cold Coil (SPCC) atau gulungan plat baja yang mengalami proses pendinginan. Material SPCC umumnya digunakan untuk pembuatan mesin mobil, peralatan motor, konstruksi bangunan, kotak baterai, mesin-mesin industri, dan sebagainya. Laju korosi ditentukan dengan metode sembur garam. Metode ini bertujuan untuk menghitung kecepatan korosi dari material yang bekerja pada lingkungan yang mengandung larutan garam seperti NaCl. Pengujian laju korosi dilakukan terhadap tiga jenis cat (cat A, cat B, dan cat C). Berdasarkan hasil analisis dan pengamatan, material Steel Plate Cold Coil yang dilapisi cat B memiliki nilai laju korosi terkecil karena cat B mempunyai resin epoxy dengan adanya senyawa aromatik eter, aromatik hidrokarbon dan alifatik alkohol.Kata Kunci: Besi, Steel Plate Cold Coil (SPCC), korosi, cat","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76739686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENINGKATAN KAPASITAS PRODUKSI GAS HIDROGEN (H2) DENGAN SUBSTRAT LIMBAH BIODIESEL OLEH MUTAN GANDA Enterobacter aerogenes AD-H43 DI BATCH STIRRED TANK REACTOR (BSTR)","authors":"Iw Hidayat, A. Mahyudin, Srikandi Srikandi","doi":"10.31938/JSN.V6I1.252","DOIUrl":"https://doi.org/10.31938/JSN.V6I1.252","url":null,"abstract":"Enhancement of Hydrogen Gas Production Capacity (H2) With Substrate of Biodiesel Waste By Double Multiles Enterobacter aerogenes Ad-H43 In Batch Stirred Tank Reactor (Bstr)Hydrogen is the simplest element consisting of only one proton and one electron. Almost all components inside the cell contain hydrogen atoms. Hydrogen gas (H2) consists of two binding hydrogen atoms. H2 can be producted by chemical / physics method and biological method. The production of H2 by chemical / physics method is done thermochemically and electrolyzed water, while biologically done by microorganisms through direct and indirect biofotolysis as well as light and dark fermentation. The results showed that H2 production using a double Enterobacter aerogenes AD-H43 mutant on the BSTR fermentor scale occurred an increase in H2 capacity followed by decreased production of lactic acid due to mutation with Ethyl Methane Sulfonate (EMS). On the glycerol substrate E. aerogenes AD-H43 produces H2 of 3.14 mol / mol glycerol while E. aerogenes AY-2 produces only H2 of 2.65 mol / mol glycerol, or an increase of 18% compared to E. aerogenes AY-2 whereas for production lactic acid decreased 33% while in biodiesel waste E. aerogenes AD-H43 yield H2 0.98 mol / mol glycerol and E. aerogenes AY-2 only 0.85 mol / mol glycerol or about 15% increase and in purified biodiesel waste resulting in a higher yield of H2 from biodiesel waste of 0.89 mol / mol glycerol at E. aerogenes AY-2 and 0.98 mol / mol glycerol in E. aerogenes AD-H43.Keywords: Hydrogen, Enterobacter aerogenes, BSTR fermentorABSTRAKHidrogen adalah unsur paling sederhana yang hanya terdiri dari satu proton dan satu elektron.  Hampir semua komponen di dalam sel mengandung atom hidrogen.  Gas hidrogen (H2) terdiri atas dua atom hidrogen yang berikatan.  Pembuatan H2 dapat dilakukan dengan metode kimia/fisika dan metode biologis.  Produksi H2 dengan metode kimia/fisika dilakukan secara termokimia dan elektrolisis air, sedangkan secara biologis dilakukan oleh mikroorganisme melalui biofotolisis langsung dan tidak langsung serta fermentasi terang dan gelap. Hasil penelitian menunjukkan bahwa produksi H2 menggunakan mutan ganda Enterobacter aerogenes AD-H43 pada skala fermentor BSTR terjadi peningkatan kapasitas H2 dengan diikuti penurunan produksi asam laktat akibat mutasi dengan Ethyl Methane Sulfonate (EMS). Pada substrat gliserol E. aerogenes AD-H43 memproduksi H2 sebesar 3.14 mol/mol gliserol sedangkan E. aerogenes AY-2 hanya  memproduksi H2 sebesar 2.65 mol/mol gliserol,atau mengalami kenaikan sebesar 18 % dibandingkan E. aerogenes AY-2 sedangkan untuk produksi asam laktatnya terjadi penurunan 33% sedangkan pada limbah biodiesel E. aerogenes AD- H43 menghasilkan  yield H2 0.98 mol/mol gliserol dan E. aerogenes AY-2 hanya 0.85 mol/mol gliserol atau terjadi kenaikan sekitar 15 % dan pada limbah biodiesel yang di purifikasi menghasilkan yield H2 yang lebih tinggi dari limbah biodiesel yaitu 0.89 mol/mol gliserol pada E. aerogenes ","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75940688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UJI SIFAT FISIKA-KIMIA DAN IDENTIFIKASI FENIL ETIL ALKOHOL MINYAK ATSIRI BUNGA MAWAR HASIL EKSTRAKSI PELARUT","authors":"Nur Malasari, Rtm Sutamihardja, Amry Syawaalz","doi":"10.31938/JSN.V7I2.258","DOIUrl":"https://doi.org/10.31938/JSN.V7I2.258","url":null,"abstract":"Test of Physical and chemical Properties  and Identification of Phenyl Ethyl Alcohol of Essential Oil Roses from Solvent ExtractionThe technology of extraction of roses oil currently is developed in small scale industries through distillation. However, this technology has many disadvantages. To overcome these obstacles, it is necessary to do research by using solvent extraction vapor (solvent extraction).This study was conducted to determine the type of solvent and the right ratio of solvent to obtain the highest \"concrete\" and \"absolute\" yields on the extraction of roses. The solvents chosen in this study were n-hexane, petroleum ether and ethanol with a ratio of 1: 3, 1: 4 and 1: 5 w / v. The 1: 5 w / v n-hexane solvent was the right solvent for extracting roses with the highest \"concrete\" and \"absolute\" yield levels for the perfume making of 0.85% and 0.07%. The main chemical component of rose essential oil detected by KGSM is phenyl ethyl alcohol with the highest phenyl ethyl alcohol content found in \"absolute\" of 1: 4 w / v n-hexane extraction of 6.53%.Keywords: Rose Flower, Essential Oil, Ekstraksi pelarutABSTRAK Teknologi ekstraksi minyak bunga mawar saat ini yang berkembang pada industri skala kecil yaitu penyulingan. Namun, teknologi ini memiliki banyak kelemahan. Untuk mengatasi kendala tersebut, maka perlu dilakukan penelitian dengan menggunakan ekstraksi pelarut mudah menguap (solvent extraction). Penelitian ini dilakukan untuk mengetahui  jenis pelarut dan perbandingan pelarut yang tepat untuk memperoleh rendemen “concrete” dan “absolut” tertinggi pada hasil ekstraksi bunga mawar. Pelarut yang dipilih pada penelitian ini adalah  n-heksana, petroleum eter dan etanol dengan perbandingan 1:3, 1:4 dan 1:5 b/v. Pelarut n-heksana 1:5 b/v  adalah pelarut yang tepat untuk mengekstraksi bunga mawar dengan kadar rendemen “concrete” dan “absolut”  tertinggi untuk pembuatan parfum sebesar  0,85 % dan 0,07%. Komponen kimia utama minyak atsiri bunga mawar yang terdeteksi oleh KGSM adalah fenil etil alkohol dengan kadar fenil etil alkohol tertinggi terdapat pada “absolut” hasil ekstraksi n-heksana 1:4 b/v sebanyak 6,53%.Kata kunci: Bunga Mawar, Minyak Atsiri, Solvent Extraction","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83274559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENGUJIAN PARAMETER FISIK SABUN MANDI CAIR DARI SURFAKTAN SODIUM LAURETH SULFATE (SLES)","authors":"Devita Cahyaningsih, Nina Ariesta, Rizki Amelia","doi":"10.31938/JSN.V6I1.250","DOIUrl":"https://doi.org/10.31938/JSN.V6I1.250","url":null,"abstract":"PHYSICAL PROPERTIES OF LIQUID SHOWER SOAP CONTAINED OF SODIUM LAURETH SULFATE (SLES) SURFACTANTSoap could be produced by saponification and neutralization process. It was contained of fatty acid, KOH, glycerin, and surfactan. The properties of surfactant determined physical properties of soap as the quality parameter of soap.  The study was conducted to examine some of the physical parameters of liquid bath soap (stability test: color, aroma, viscosity, homogeneity, viscosity and pH) in accordance with applicable standards. The study was conducted using soap which was contained of SLES surfactants (Sodium Laureth Ether Sulfate). The results were pH 8.61 and viscosity 55254 cps on stability test include oven test, cycle test, room test, and sun test.Keywords: liquid shower, Sodium Laureth Ether Sulfate, soap stability ABSTRAKSabun yang merupakan salah satu kosmetik pembersih dapat dibuat melalui dua proses, yaitu saponifikasi dan netralisasi. Sabun tersusun dari berbagai bahan, seperti asam lemak, KOH, gliserin, dan surfaktan. Sifat surfaktan dalam sabun menentukan sifat fisik dari sabun yang dihasilkan dan sebagai salah satu faktor penentu mutu. Tujuan dari penelitian ini adalah untuk menguji beberapa parameter fisik sabun mandi cair (uji stabilitas: warna, aroma, kekentalan, homogenitas, viskositas dan pH) sesuai dengan standar yang berlaku, sehingga dapat dilanjutkan ke tahap pengujian berikutnya. Penelitian ini dilakukan dengan menggunakan surfaktan SLES (Sodium Laureth Ether Sulfate). Beberapa parameter fisik terukur adalah pH 8,61 dan viskositas 55254 cps pada pengujian stabilitas meliputi oven test, cycle test, room test, dan sun test.Kata Kunci: sabun cair, Sodium Laureth Ether Sulfate, stabilitas sabun","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90005606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ALTERNATIF METODE ANALISIS PENETAPAN KADAR ASAM MEFENAMAT DALAM PONSAMIC 500 mg TABLET SALUT SELAPUT","authors":"Syahruni Syahruni, D. Arrisujaya","doi":"10.31938/JSN.V6I1.249","DOIUrl":"https://doi.org/10.31938/JSN.V6I1.249","url":null,"abstract":"Alternative of analytical methods of assay mefenamic acid in posamic 500 mg film coated tabletThe level of active substance is a requirement that must be met to ensure the quality of medicinal preparations, to carry out the assay of the active drug substance required a method that has been validated. The validity of alternative methods of assay in ponsamic mefenamic acid 500 mg film coated tablet (trade name) has been performed. Mefanat acid assay method using UV spectrophotometry, so that the limited availability of tools that can be resolved HPLC. The validity of alternative methods tested by the parameters of accuracy with standard addition method and parameters accuracy. Based on the results obtained by the value of the linearity was r equal to 0,999 and the percentage difference spectrophotometric method with HPLC method (% difference) at 0,16%. The results showed an alternative method of assay in ponsamic mefenamic acid 500 mg film coated tablet (trade name) using spectrophotometric methods, qualified acceptance in accordance with ISO / IEC 17025.Keywords: Mefenamic acid, validation method, UV spectrophotometryABSTRAK Pemeriksaan kadar zat aktif merupakan persyaratan yang harus dipenuhi untuk menjamin kualitas sediaan obat, untuk melakukan penetapan kadar zat aktif obat dibutuhkan suatu metode yang telah divalidasi. Validitas metode alternatif penetapan kadar asam mefenamat dalam ponsamic 500 mg tablet salut selaput (nama dagang) telah dilakukan. Metode penentuan kadar asam mefanat menggunakan spektrofotometri UV, sehingga ketersediaan alat HPLC yang terbatas dapat teratasi. Validitas metode alternatif diuji berdasarkan parameter akurasi dengan metode penambahan baku dan parameter ketelitian. Berdasarkan hasil diperoleh nilai linearitas adalah r sebesar 0,999 dan  persentase perbedaan metode spektrofotometri dengan metode HPLC (% Difference) sebesar 0,16%. Hasil penelitian menunjukkan metode alternatif penetapan kadar asam mefenamat dalam ponsamic 500 mg tablet salut selaput (nama dagang) menggunakan metode spektrofotometri, memenuhi syarat untuk diterima sesuai ISO/IEC 17025.Kata kunci : Asam mefenamat, Validasi metode, Spektrofotometri UV","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90145201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AKTIVITAS ANTIBAKTERI INFUSA DAUN LIDAH BUAYA (Aloe vera L) TERHADAP PERTUMBUHAN Staphylococcus aureus DAN Escherichia coli","authors":"Y. Widyastuti, N. Yuliani, I. Widhyastini","doi":"10.31938/JSN.V6I1.253","DOIUrl":"https://doi.org/10.31938/JSN.V6I1.253","url":null,"abstract":"Antibacterial Activity of Infused Aloe Vera Leaf (Aloe Vera L) on Growth Of Stapylococcus aureus and Escherichia coliDisinfectants may act as antibacterials. Aloe vera (Aloe vera L) is one of the plants that is often used by the community as a medicinal plant that has many active compounds such as lignin, saponin and anthraquinone substances that act as antibacterial. This study aims to determine the antibacterial activity of Aloe vera leaf extracted with infusa method on the growth of Staphylococcus aureus and Escherichia coli bacteria. The research method is to see the reduction / reduction of bacterial count (% reduction) after 30 second and 60 second with disc diffusion method. The results showed decrease or decrease of bacteria count (% reduction) to Escherichia coli bacteria found in aloe leaf skin infected by 28,2% after 60 seconds. While decrease or decrease of bacteria amount (% reduction) to Staphyloccocus uareus bacteria infusa mixture of meat and skin of Aloe vera leaves of 27.5% after 60 seconds. Antibacterial test of aloe vera leaf aloe (Aloe veraL) of 100% concentration by disc diffusion method did not show any inhibition zone around cultures of test bacteria.Keywords: Aloe vera, antibacterial activity, Staphylococcus aureus, and Escherichia coli, Infusa.ABSTRAKDesinfektan dapat berfungsi sebagai antibakteri. Lidah buaya (Aloe vera L) merupakan salah satu tanaman yang sering digunakan masyarakat sebagai tanaman obat yang memiliki banyak senyawa aktif seperti lignin, saponin dan antrakuinon yaitu zat yang berfungsi sebagai antibakteri. Penelitian ini bertujuan untuk mengetahui aktivitas antibakteri daun lidah buaya (Aloe vera L) yang diekstrak dengan metode infusa terhadap pertumbuhan bakteri Staphylococcus aureus dan Escherichia coli. Metode penelitian yaitu dengan melihat penurunan/pengurangan jumlah bakteri (% reduksi) setelah waktu 30 detik dan 60 detik dengan metode difusi cakram. Hasil penelitian menunjukkan penurunan atau pengurangan jumlah bakteri (% reduksi) terhadap bakteri Escherichia coli terdapat pada infusa kulit daun lidah buaya yaitu sebesar 28,2 % setelah waktu 60 detik.Sedangkan penurunan atau pengurangan jumlah bakteri (% reduksi) terhadap bakteri Staphyloccocus uareus terdapat pada infusa campuran daging dan kulit daun lidah buaya yaitu sebesar 27,5 % setelah waktu 60 detik. Uji antibakteri infusa daun lidah buaya (Aloe veraL) konsentrasi 100% dengan metode difusi cakram tidak menunjukkan adanya zona penghambatan disekitar biakan bakteri uji.Kata kunci : Lidah buaya, Aktivitas antibakteri, Staphylococcus aureus, dan   Escherichia coli,   Infusa.","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80679705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PENETAPAN NILAI KALORI DALAM BATUBARA DENGAN KALORIMETER PARR 6200","authors":"Finda Pratiwi Istomo, Ameylia Tristiasti","doi":"10.31938/JSN.V7I2.257","DOIUrl":"https://doi.org/10.31938/JSN.V7I2.257","url":null,"abstract":"Determining Calory Value of Coal With Calorimeter Parr 6200 Coal is a source of energy utilized by the process of making cement. This type of coal determines the quality and calorific value of the coal. Determination of calorific value on coal is done by using calorimeter. Coal types studied were A and B coal mixture with ratio 80:20, 70:30, 60:40, and 50:50. The results showed that the mixture of A and B coal with a ratio of 80:20, 70:30, 60:40, and 50:50 can be used for combustion in the manufacture of cement in the furnace because it has a calorific value above 6000 in accordance with the standards of the cement factory . Water content affects the calorific value of coal, the higher of moisture content, the lower the heating value.Keywords: Coal, Calorimeter, Heat valueABSTRAK Batubara merupakan sumber energi yang dimanfaatkan oleh proses pembuatan semen. Jenis batubara menentukan kualitas dan nilai kalor dari batubara tersebut. Penentuan nilai kalor pada batu bara dilakukan dengan menggunakan kalorimeter. Jenis batubara yang diteliti yaitu Campuran batubara A dan B dengan perbandingan 80:20, 70:30, 60:40, dan 50:50. Hasil penelitian menunjukkan bahwa campuran batubara A dan B dengan perbandingan 80:20, 70:30, 60:40, dan 50:50 dapat digunakan untuk pembakaran dalam pembuatan semen di tanur bakar karena memiliki nilai kalori diatas 6000 sesuai dengan standar perusahan pabrik semen. Kadar air mempengaruhi nilai kalori batubara, yaitu semakin tinggi kadar air semakin rendah nilai kalor.Kata Kunci: Batu Bara, Kalorimeter, nilai kalor","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90476132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TINGKAT KEMATANGAN BIJI KOPI ARABICA (Coffea arabica L.) DALAM MENGHASILKAN KADAR KAFEIN","authors":"Srikandi Srikandi, A. Kristanti, Rtm Sutamihardja","doi":"10.31938/JSN.V9I1.189","DOIUrl":"https://doi.org/10.31938/JSN.V9I1.189","url":null,"abstract":"Levels of Arabica (Coffea Arabica L.) Coffee Materials in Producing Caffein Coffee is a plantation crop that has long been cultivated in Indonesia. One type of coffee grown in Indonesia, namely arabica coffee. Arabica coffee is coffee that has superior quality compared to other types of coffee. Testing of caffeine content in Sukamakmur village arabica coffee is differentiated into three types of coffee berries based on the maturity level of the coffee fruit. The level of maturity of coffee fruit is marked by the color of coffee fruit skin. The collection of young coffee fruit is characterized by green fruit rind, half-aged coffee, orange rind and old coffee, dark red rind. Arabica coffee fruit is processed from drying, drying, and roasting and grinding into arabica ground coffee. Powder coffee samples are used for water content testing, phytochemical identification, and caffeine level testing. Caffeine content testing using UV-Vis spectrophotometry. The results of water content testing showed that the highest water content was found in coffee with a maturity level of half old, the lowest moisture content found in old coffee. Phytochemical identification testing performed showed powdered coffee samples containing active compounds of saponins, flavonoids, and alkaloids, as well as tannins. The highest caffeine content is found in ground coffee with the maturity level of coffee half old at 1.56% and the lowest caffeine level in ground coffee with a young coffee level of 0.93%.Keywords : Coffea arabica L., Level of maturity, Level of caffeine. ABSTRAKKopi adalah tanaman perkebunan yang sudah lama dibudidayakan di Indonesia. Salah satu jenis kopi yang ditanam di Indonesia, yaitu kopi arabika. Kopi arabika merupakan kopi yang memiliki kualitas superior dibanding jenis kopi lainnya. Pengujian kadar kafein pada kopi arabika desa Sukamakmur dibedakan menjadi tiga jenis pengambilan buah kopi berdasarkan tingkat kematangan buah kopi. Tingkat kematangan buah kopi ditandai dengan warna kulit buah kopi. Pengambilan buah kopi muda ditandai dengan kulit buah berwarna hijau, kopi setengah tua, kulit buah berwarna jingga dan kopi tua, kulit buah berwarna merah tua. Buah kopi arabika diolah dari penjemuran, pengeringan, dan penyangraian serta penggilingan menjadi kopi bubuk arabika. Sampel kopi bubuk digunakan untuk bahan pengujian kadar air, identifikasi fitokimia dan pengujian kadar kafein. Pengujian kadar kafein menggunakan metode spektrofometri UV-Vis. Hasil pegujian kadar air menunjukkan bahwa kadar air tertinggi terdapat pada kopi dengan tingkat kematangan setengah tua, kadar air terendah terdapat pada kopi tua. Pengujian identifikasi fitokimia yang dilakukan menunjukan sampel kopi bubuk mengandung senyawa aktif saponin, flavonoid, dan alkaloid, serta tanin. Kadar kafein tertinggi terdapat pada kopi bubuk dengan tingkat kematangan kopi setengah tua sebesar 1,56% dan kadar kafein terendah pada kopi bubuk dengan tingkat kopi muda sebesar 0,93%.Kata kunci: Coffe","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90106387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BENTONIT TERAKTIVASI ASAM SULFAT SEBAGAI ADSORBEN DALAM PEMURNIAN PELUMAS BEKAS","authors":"Tiva Lathifah, N. Yuliani, G. A. P. K. Wardhani","doi":"10.31938/JSN.V9I1.170","DOIUrl":"https://doi.org/10.31938/JSN.V9I1.170","url":null,"abstract":"Activated Bentonits of Sulfatic Acid as Adsorben in Purchase of Used Lubricants Recycling of used lubricating oil is one of the alternatives in the framework of efficiency, saving oil consumption, and reducing pollution. One effort to purify used lubricating oil is to separate impurities through the adsorption method. The adsorbent that can be used is bentonite. Activation of bentonite using acid will produce adsorbent with an active side and greater surface acidity so that the adsorption ability is higher than before activated. Characteristics of lubricating oil produced are: kinematic viscosity 40 °C and 100 °C at 109.94 cSt and 14.57 cSt recently; viscosity index is 136; specific gravity 15 °C is 0.8872; and the resulting color is L5.0. Activated sulfonic bentonite can be an optimum adsorbent in purifying used lubricating oil, with optimum bentonite concentration is 30% and optimum adsorption temperature is 70 °C resulting in a 49% increase in viscosity efficiency of 40 °C and 30.79% for temperatures of 100 °C.Keywords: Bentonite, Lubricants, Adsorption  ABSTRAK Daur ulang minyak pelumas bekas merupakan salah satu alternatif dalam rangka efisiensi, penghematan konsumsi minyak bumi, serta mengurangi pencemaran. Salah satu upaya menjernihkan minyak pelumas bekas adalah dengan memisahkan zat-zat pengotor melalui metode adsorpsi. Adsorben yang dapat digunakan adalah bentonit. Aktivasi bentonit menggunakan asam akan menghasilkan adsorben dengan sisi aktif dan keasaman permukaan yang lebih besar sehingga kemampuan adsorpsinya lebih tinggi dibandingkan dengan sebelum  diaktivasi. Karakteristik minyak pelumas yang dihasilkan yaitu: viskositas kinematik 40 °C  dan 100 °C  sebesar 109,94 cSt dan 14,57 cSt secara berturut-turut; indeks viskositas sebesar 136; specific gravity 15 °C  sebesar 0,8872; serta warna yang dihasilkan adalah L5,0. Bentonit teraktivasi asam sulfat mampu menjadi adsorben yang optimum dalam pemurnian minyak pelumas bekas, dengan  konsentrasi bentonit optimum adalah 30% dan suhu adsorpsi optimum adalah 70 °C menghasilkan % efisiensi kenaikan viskositas  sebesar 49,15% untuk suhu 40 °C dan 30,79% untuk suhu 100 °C.Kata kunci : adsorpsi, bentonit, pelumas","PeriodicalId":17812,"journal":{"name":"JURNAL SAINS NATURAL","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84182943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}