bluuebunny/crossref_metadata_2025_split huggingface dataset:
PENGARUH SUHU PADA PEMBENTUKAN PRECIPITATED CALCIUM CARBONATE (PCC) MELALUI METODA KAUSTIK SODA DENGAN MENGGUNAKAN	PELARUT ASAM KLORIDA
Authors: Hermawan Budi , Arief Syukri , Jamarun Novesar 
Published: October 2017

ABSTRACT Precipitated Calcium Carbonate (PCC) is the limestone product resulting from certain process steps. By XRF measurement it has found that the content of CaO (oxide calcium) in limestone Bukit Tui Padang Panjang as follows 54.19%, SiO2 1.03%, Al2O3 0.39%, MgO 0.46% and Fe2O3 0.2%. Rendemen PCC at optimum concentration of 0.75 M HCl is 69.77%. The formation of PCC by using the highest PCC rendemen aquabides is 9.28% at optimum temperature of 50°C. With 0.75 M HCl, the highest rendemen is 79.32% at optimum temperature 70°C. The formation of crystals in the form vaterite, aragonite and calcite were evidenced by X-ray Diffraction (XRD). Treatment with 2.00 M HCl at 30°C showed the formation of vaterite (45.83%), aragonite (35.93%) and calcite (18.24%) with crystals size of 28.43 nm. In the other case, preparation with 0.75 M HCl at 30°C resulting the percentage of vaterite and aragonite which were 73.01% and 26.99% respectively fairished 28.06 nm. Then for the one which were treated with 0.75 M HCl at 70°C indicated the formation of vaterite (75.53%) fairished 33.68 nm and aragonite (24.47%). SEM (Scanning Electron Microscopy) towards the sample prepared from 0.75 M HCl at 30°C have clearly shown that the particle sphere fairished at 3.68 nm where the one treated with 0.75 M HCl at 70°C having particle sphere fairished at 3.3 µm showing needle like estimated of 3.8 µm. Keywords : Precipitated Calcium Carbonate (PCC), caustic soda method
SISTEM BIOFILTRASI AIR RAWA GAMBUT DAN PENGARUH FILTRASI TERHADAP pH, BOD, COD, TSS DAN ASAM HUMAT AIR RAWA GAMBUT DENGAN ADANYA PENAMBAHAN KARBON
Authors: - Hasnirwan , Aziz Hermansyah , Whulanda Rhieka 
Published: October 2017

ABSTRACT The research about bio-filtration of peat water using paddy chaff coated by carbon as filter biomaterial has been conducted. Iodimetry titration method was selected for determination of BOD and COD concentration, while gravimetry method and UV/Vis spectrophotometry is used to determinate TSS and humic acid containing in sample. The results of filtration with bio-filter lock up this paddy able to reduce organic compounds in peat water. The existence of coating carbon causing of BOD 22.37 mg/L (without carbon 27.73 mg/L), COD 54.30 mg/L (without carbon 86.02 mg/L), TSS 120 mg/L (without carbon 155 mg/L) concentration was decreasing, especially at the third step of filtration. Keywords : peat water, biofiltration, biomass
PENGARUH UDARA TERHADAP FOTOLISIS AIR	OLEH SERBUK TiO2 DENGAN ADANYA KALIUM IODIDA
Authors: Alif Admin , Aziz Hermansyah , Tetra Olly Norita , Prima Suci Mulya 
Published: October 2017

ABSTRACT Hydrogen is one of the promising alternative energy sources which is environmentally-friendly. Amongs several methods that have been used to produce hydrogen is a photolysis base on photochemical reaction which has been choosen and applied for this work. In this system where water was photolyzed in the present of TiO2 powder as photocatalyst and potassium iodide as sacrificial agent. The sample was prepared by addition various potassium iodide concentrations and then each sample was treated in the present and absent of air. The sample was placed in a quartz reactor which was then illuminated by a Philips low pressure vapoured mercury lamp (λ = 254 nm) as light source for 7 hours. Produced gas volume was measured by a method based on the movement of soap bubbles. The results showed that the maximum gas volume obtained at 0.006 g/L TiO2 and 0.1 g/L KI concentration (in the present and absent of air) were applied. Furthermore, the maximum volume of hydrogen gas was produced at the present of air. In the present of air, dissolved oxygen accelerated H2 gas productions which act as oxidation agent and electron carrier to H+. Keywords: Photolysis, Photocatalyst, Titania, Hydrogen, Sacrificial agent
STUDI OPTIMASI PENENTUAN KADMIUM(II) SECARA VOLTAMMETRI STRIPPING ADSORPTIF
Authors: Deswati Deswati , Suyani Hamzar , Buhatika Citra 
Published: October 2017

ABSTRACT Study of optimation cadmium(II) by adsorptive stripping voltammetry has been done. The aim of this study to get optimum conditions for determination of Cd(II). Parameters were done : potential accumulation, time accumulation, pH, supporting electrolite concentration and optimum of complex concentration. In this case, the optimum conditions were reached in potential accumulation -0.7 V, time accumulation 60 second, pH 7.0, NH4Cl 0.12 M, calcon concentration 0.12 mM. In the optimum condition was obtained with the relative standard deviation was 4.61% for eight replicates, measurements of 0.01 ppm. The method was applied to the direct determination of Cd(II) in water around Batang Air Dingin Lubuk Minturun and Muara Padang. Concentration Cd(II) in sample was equal to 7.359 μg/L and 3.659 μg/L with recovery of 99.04%. Keywords: cadmiun, adsorptive, stripping, voltammetry
KOMBINASI BATU PASIR-BENTONIT TERAKTIVASI SEBAGAI ADSORBEN ANION Cr(VI) PADA AIR LINDI TEMPAT PEMBUANGAN AKHIR (TPA) SAMPAH
Authors: Linda Roza , - Islamias , Firmansyah Firdaus 
Published: October 2017

ABSTRACT This research is conducted to know optimum conditions and absorption efficiency of combinated nature bentonite-limestone as anion adsorbent Cr(VI) in lindi of garbage. Batch method was used in this research, and adsorbent was activated using H2SO4 and heating. The result shows that absorption efficiency Cr(VI) in lindi garbage using combinated nature bentonite-limestone is 86.85%. Optimum condition of absorption achieved used adsorbent that have activated with H2SO4 1.6 M and heated temperature 140°C. Keywords: combinated nature bentonite-limestone, lindi, absorption efficiency
EFEK PEMBERIAN VITAMIN E TERHADAP PENURUNAN KADAR MALONDIALDEHID (MDA) HATI MENCIT STRAIN JEPANG AKIBAT PAPARAN MINYAK GORENG BERULANG
Authors: Sy Elmatris , Alioes Yustini , - Almurdi 
Published: October 2017

ABSTRACT SOR (Reactive Oxygen Species) is a collection of free radical compound or compounds that easily become free radicals and can damage the cell membrane is marked by elevated levels of MDA (11) This is called oxidative stress, which can be prevented and reduced by adequate intake of antioxidants into the body optimally. Oxidative stress effects can be prevented by antioxidant vitamins, especially vitamin E. The results of research show that the average value of mouse liver MDA levels of the control group (A) 1.78 nmol/mL. The treatment group with repeated delivery of cooking oil (B) have increased the average value of mouse liver MDA levels (2.97 nmol/mL, 3.18 nmol/mL, 3.49 nmol/mL, 3.83 nmol/mL). In the treatment group with doses of vitamin E 52 IU/Kg/Hr and repeat cooking oil (C) have decreased the average value of mouse liver MDA levels (2.03 nmol/mL, 2.10 nmol/mL, 2.24 nmol/mL, 2.70 nmol/mL), compared with the provision of cooking oil over it. We can conclude that there are differences in average MDA levels of the liver of mice a significant between group A, group B1, C1 group (p = 0.003). Mice liver MDA content significantly between group A, group B2, C2 group (p = 0.000), between group A, group B3, C3 group (0.001), between group A, group B4, C4 group (0.000) where p <0.05. Keywords: Recurring Cooking Oil, Vitamin E, Malondialdehid (MDA)
STUDI SEMIEMPIRIS STRUKTUR MOLEKUL DAN BAND GAP MONOMER DAN DIMER 1,3,4 TIADIAZOL DAN DERIVATNYA
Authors: - Emdeniz 
Published: October 2017

In order to know the possibility of compounds and their derivative for semiconductor material, moleculer structure and band gap (Eg) of these compounds need to be studied. This work included 1,3,4 tiadiazole and 1,3,4 tiadiazole derivative with –C≡N and –C≡CH substituents. Each compounds was optimized by Calzaferri methods. The calculation results show that monomers and dimers 1,3,4 tiadiazole and thair derivative have Eg in the range of 2.89760 eV to 4.35801 eV. These compounds has potential for basis of material organic semiconductor. Keywords: Semiconductor, Band gap, Tiadiazole.
EMISI DAN ABSORPSI GAS METANA PADA SISTEM PENANAMAN PADI DI AREA TANAH SAWAH
Authors: Salim Marniati , Faizah Hiyal , Sudiana I Made 
Published: October 2017

To know there are emission and methane absorption, research was conduted by measuring directly gas methane at the rice field and absorption with metanotroph bactery using chromatography gas. From the research, we know that there is methane gas emission at the rice field. Watery land condition, emit methane gas (2,309 mg/L) larger than not watery land (0,059 mg/L). At the same time and paddy age is 2 month, it also emit larger methane gas (1,809 mg/L) than 1 month age paddy (1,758 mg/L) and without paddy (0,697 mg/L), whereas for methane absorption at land sample T0, T1, T2, T3, shows that with fertilizer given can increase the reduction of injected methane gas. Keywords: Absorption, Metanotroph bacteria, Methane gas emission
FORMULASI MIKROPARTIKEL BERPORI DALAM POLI (D,L-Laktida) SEBAGAI SCAFFOLDDENGAN TEKNIK EMULSIFIKASI PENGUAPAN PELARUT
Authors: Fitriani Lili , Suciati Tri 
Published: October 2017

ABSTRACT Poly (D,L-lactide acid) has been used as scaffold for tissue engineering. In this study, PDLLA microparticles were made into porous microparticles. Porous microparticles were proposed to reduce burst release of protein and to prevent diffusion of released protein into non-target tissue. Formulation of porous microparticles was made by water-oil-water (W1/O/W2) emulsification-solvent evaporation using gas foamed as porogen. Variations of the amount of sodium bicarbonate, volume of citric acid solution and time for homogenization were optimized to produce optimum formulation. Evaluation for this microparticles included morphology of particles, particle size distribution and porosity. Porous microparticle produced by ratio volume of acid : dichloromethane : poly(vynil alcohol) (PVA) = 1:3:3 and the ratio of sodium bicarbonate : PDLLA = 2:3 was the optimum formulation. Keywords :Porous Microparticles, PDLLA,Gas Foamed, Scaffold, Solvent Evaporation
MEKANISME INHIBISI ENZIM POLIFENOL OKSIDASE PADA SARI BUAH MARKISA DENGAN SISTEIN DAN ASAM ASKORBAT1
Authors: Mardiah Elida 
Published: October 2017

ABSTRACT The mechanism of polyphenol oxidase enzyme inhibition was studied by isolation of enzyme from the passion fruite juice (Passiflora Sp). The extracted enzyme polyphenol oxidase has an optimum activity at pH 5,6 and temperature of 300 C using a pirogalol substrate. The pattern of inhibition of the enzyme polifenol oxsidase studied using cysteine and ascorbic acid. Cystein of 10 mM consentration can inhibit the enzyme polyphenol oxidase activity as 97.25%, ascorbic acid with the same concentration can inhibit the enzyme polyphenol oxsidace 96.5%. The pattern of inhibition of cysteine is more likely to be competitive, while non-competitive with ascorbic acid. Keyword: polyphenol oxsidase, inhibition, cysteine, ascorbic acid
STUDI OPTIMASI PENENTUAN Cu(II) DENGAN MENGGUNAKAN KALKON SEBAGAI PENGOMPLEK SECARA VOLTAMMETRI STRIPPING ADSORPTIF (AdSV)
Authors: - Deswati , Suyani Hamzar , Arifin Bustanul , - Imelda , Salamah Yunita 
Published: October 2017

ABSTRACT The research about determination of Cu(II) by adsorptive stripping voltammetry (AdSV) was conducted. AdSV method was applied to the determination of copper in ultra trace concentration. The parameters of ligand, accumulation potential, accumulation time, pH and ligand concentration was studied. Calcon was found as complexing agent that give the highest peak current. The optimum condition are accumulation potential -0,7 V, accumulation time 60 s, pH 10, and calcon concentration 0.12 mM. The relative standar deviation (n=8) at 10 µg/L standard concentration were obtained 4,27 %. This method was applied to determination of Cu(II) in sample from Batang Air Dingin, Lubuk Minturun and Muara Padang. The sample concentration were 4,778 µg/L and 5,189 µg/L for Batang Air Dingin and Muara Padang, respectively. The recovery of this method was studied for sample from Muara Padang and 98,31 % was obtained. Key words : Adsorptive, Stripping, Voltammetry, Calcon and Copper
UJI AKTIVITAS ANTIMIKROBA SERTA ANTIOKSIDAN ASAP CAIR CANGKANG SAWIT (Elaeis gueneensis jack)
Authors: - Yefrida , - Refilda , - Indrawati , Siregar Irma Yanti 
Published: October 2017

ABSTRACT Liquid smoke is one of natural preservative. It can make from many sources such as coconut shell, wood, etc. In this study, it is made from the palm kernel shell (Elaeis gueneensis jack) by using pirolysis method. Its contains is determined by GC-MS, while antimicrobial activity by Kirby-Bauer method and antioxidant activity by DPPH method. From the test, it can be concluded that this liquid smoke contains carboxylic acids, fenol and its derivative compound as a major component and has a good enough antimicrobial and antioxydant activity. Keywords : liquid smoke, pirolysis, antimicrobial, antioxvdant.
PERBANDINGAN PENYERAPAN UNSUR HARA OLEH TANAMAN PADI (Oryza Sativa.L ) DENGAN TANAMAN KACANG PANJANG ( Vigna sinensis ) YANG DITANAM PADA TANAH MENGGUNAKAN ICP-MS
Authors: Chaidir Zulkarnain , Dharma Abdi , Munaf Edison , Manjang Yunazar , Zein Rahmiana 
Published: October 2017

ABSTRACT Comparative studies on nutrient uptake ability of rice plants (Oryza Sativa.L) that represent groups of plants dicotyledonous with long beans (Vigna sinensis) representative of the group of plants monocotyledonous have been conducted. The study was conducted on a community farm located in the Village of Sungai Sapih Padang, at plants are used as the sample is sokan varieties. The root of leaves and fruit as well as beans, the same parts are used as sample.Morphological observations of roots, leaves and fruit using the SEM showed the difference between the rice and beans. While the homogenity for fruit rice and beans especially almost the same. The results of nutrient measurements performed by ICP - MS, elemental carbon is the largest percentage of nutrients in the two plants in average above 50% in all parts of the plant. The percentage of Ca, Mg and N elements in the leaves of beans is higher than in the rice leaves, otherwise the percentage of Si element is higher in the rice plants. Key words: absorption, nutrients, Oryza sativa, Vigna sinensis, ICP-MS
OPTIMASI NUTRISI MEDIA PERTUMBUHAN BAKTERI TERMOFIL PENGHASIL SELULASE DARI SUMBER AIR PANAS RIMBO PANTI
Authors: - Armaini , Dharma Abdi , Syukur Sumaryati , - Jamsari 
Published: October 2017

Optimization have been done on the media for the growth of the isolated thermophiles bacteria from hot springs Rimbo Panti, the nutrients comprising variety of carbon sources such as CMC (carboxymethyl cellulose), avicell (micro crystalline cellulose), and cellobiose, with a variety of sources organic nitrogen, peptone, extracts yeast, tryptone, and urea, as well as variations consist of inorganic nitrogen sources, KNO3, NaNO3, (NH4)2SO4, and (NH4)NO3. Determination of cellulase activity performed using DNS reagent (3,5-dinitro salicylic acid). Maximum cellulase production with high activity based on the results of this research, the best of carbon source is CMC with optimum concentration 0.125%, inorganic nitrogen source is peptone with the optimum concentration of 0.3 to 0.4% and the inorganic nitrogen source is (NH4)2SO4 with optimum concentration of 0.2 - 0.25%. Optimization of size of inoculums obtained the optimum amount of inoculums 2%. Keywords: Optimization, thermophiles bacteria, cellulose, carbon sources, nitrogen sources
PEMBUATAN SEL SURYA TERSENSITASI ZAT WARNA MENGGUNAKAN EKSTRAK KELOPAK BUNGA ROSELLA (Hibiscus sabdariffa) DAN KULIT MANGGIS (Garcinia manggostana)
Authors: Aziz Hermansyah , Alif Admin , Chairani Zulfa 
Published: October 2017

Vol 5 No 1ABSTRACT The roselle flower and mangosteen pericarp dyes were applied as dye sensitizer for dye-sensitized solar cell. The solar cell was composed of a thin film TiO2 as working electrode, 2B pencil as controle electrode, and I-/I3- as electrode couple. The influence of dipping time of working electrode in dyes extract on the cell efficiency was investigated. The highest efficiency of roselle and mangosteen dye-sensitized solar cells was obtained at 60-minutes dipping, respectively as 0.017% and 0.032%. Characterization of both dyes extract by UV-Vis Spectrophotometry method showed that dyes adsorb in visible region. Keywords: Solar cell, sensitized, dyes, antosianin, TiO2
MEMPELAJARI KONDISI OPTIMUM PEMBUATAN BIOETANOL MELALUI HIDROLISIS ENZIMATIS MENGGUNAKAN Sacharomycess cereviceae DARI PATI SAGU DAN UMBI TALAS
Authors: Salim Marniati , Mardiah Elida , Opthymal Yosi , Febrizal Febby 
Published: October 2017

Vol 5 No 1ABSTRACT Sago (Metroxylon sp) and umbi talas (Colocasia gigantea Hook F) are natural resources that are found in plantyfull Indonesian. However, these potencies are not yet processed to give an optimum value added product. Sago and taro are rich of starch, that could be fermented to form bioethanol for reneweable energy. The ethanol were produced by fermenting the hydrolized starch of sago and taro with yeast. The starch of sago and taro were hydrolized enzymaticly by α-amylase and glucoamylase. Sago and taro (15 g each) were grinded and hydrolized by α-amylase and then by glucoamylase at the variation of volume of 4, 5, 6, 7, and 8 mL for 1, 2, 3, 4, and 5 hours. The glucose produced was measured by Somogy-Nelson methods. The product of sago hydrolysis were optimum with 6 mL of α-amylase and 6 mL glucoamylase for 2 hours to give 59.11 g/L of reducing sugar. The product of taro with 6 mL α-amylase and 7 mL glucoamylase for 4 hours which gave 64.22 g/L of reducing sugar. The product of ethanol were analyzed by Gas Cromatography (GC). The maximum bioethanol production obtained optimum after 4 days fermentation of hydrolized sago starch and after 5 days fermentation of hydrolized taro starch which were 3.742% and 4.0123%. Key words: Bioethanol, sago starch, taro, enzymatic hydrolysed, α-amylase and glucoamylase
SKRINING DAN IDENTIFIKASI BAKTERI PENDEGRADASI INULIN DARI SUMBER AIR PANAS PADANG BALIMBIANG DI SOLOK
Authors: Azhar Minda , Syukur Sumaryati , Natalia Dessy , - Vovien , - Jamsari 
Published: October 2017

ABSTRACT Thermophilic bacteria and thermotolerant bacteria are potential sources of thermostable of inulin degradating enzyme, an enzyme which converts inulin into fructose and FOS prebiotics. Isolation and identification of 16S rDNA gene inulin degradation bacteria from hot springs of Padang Balimbiang in Solok have been undertaken. Screening of inulin degradation bacteria was done using direct and undirect methods on medium with inulin or inulin-RBB as a sole carbon source. One inulin degradation bacteria have been obtained from 21 isolates. The isolate was designated as UBCT-030. The isolate is able to grow at temperature 23 °C to 60 °C. According to 16S rDNA gene analysis, phisiology and morphology bacteria on UBCT-030 isolate was identified as Bacillus subtilis. Keywords: inulinase bacteria, hot springs, Bacillus subtilis, inulin, 16S rDNA gene
DIP-COATING SENYAWA KALSIUM FOSFAT DARI BATU KAPUR BUKIT TUI MELALUI METODE SOL-GEL
Authors: Jamarun Novesar , Anggresani Lia , Arief Syukri 
Published: October 2017

ABSTRACT Preparation of Dip-Coating Calcium Phosphate via sol-gel method using natural limestone Bukit Tui as calcium precursors and diammonium hydrogen phosphate as phosphorus precursors with sol-gel process has been investigated. Ethanol was used as solvent and DEA (diethanolamine) was used stabilizing agent. The powder were prepared by calcinated the sol at 950 oC. The products were characterized by Fourier Transform Infra Red, X-Ray Diffraction and Scanning Electron Microscopy. FTIR results showed that the vibration form was PO43-, P2O74-, O-H and CO2. XRD patterns of powder with various Ca/P mol ratio showed that the product of calcium phosphate was Ca2P2O7 and also found the hydroxyapatite Ca10(PO4)6(OH)2 in Ca/P mol ratio 1,7. SEM images of powder calcium phosphate revealed that their morphology were spheric and homogen. The coating process was done at glass substrate with coating speed 20 cm/min by calcinations at 400 oC. XRD patterns of thin layer showed that the product was Ca2P2O7 and SEM images of thin layer revealed that their morphology were bulk. Keywords: Natural limestone, calcium phosphate, hydroxyapatite, sol-gel, dip-coating
TRANSPOR IODIN MELALUI MEMBRAN KLOROFORM DENGAN TENIK MEMBRAN CAIR FASA RUAH
Authors: - Refinel , Kahar Zaharasmi , - Sukmawita 
Published: October 2017

Vol 5 No 1ABSTRACT The transport of iodine through a bulk liquid membrane containing chloroform as the solvent and alkaline sodium sulfite solution as the receiving phase was studied .Iodine transport was performed by bulk liquid membrane technique consist of 10 mL I2/KI solution as feed phase, Na2SO3 (20 mL) and NaOH solution as receiving phase, and chloroform (30 mL) as membrane phase which was stirred 100 rpm. The presence of iodine both in feed and receiving phase then where determined by Spectrophotometer UV-Vis with λ max at 567 nm. The optimum conditions for iodine transport investigated from this work are 4x10-3 N, pH 4 in feed phase, pH 9 in receiving phase, I2 : KI ratio in feed phase (2 : 5), and a stirring duration is 180 minutes. As conclusion the bulk liquid membrane technique with Na2SO3 and NaOH as receiving and acception substances is potential for iodine transport resulting 78.6 % of iodin transport. Keywords: Iodine, transport, chloroform, bulk liquid membrane, Na2SO3, NaOH
PERUBAHAN KOMPOSISI METIL ESTER AKIBAT KERUSAKAN PANAS PADA METIL ESTER SULFONAT DARI JARAK PAGAR
Authors: Hidayati Sri 
Published: October 2017

Vol 5 No 1ABSTRACT Surfactant is a surface-active agent that can be produced by a chemical or biochemical synthesis. The most widely used anionic surfactant in surfactant flooding is linier alkyl benzene sulfonate (LAS) synthesized from petroleum material. The weaknesses of petroleum based surfactant are: it is made from nonrenewable resources, has very poor detergency in hard water and naturally are difficult to be degraded. These problems can be overcome by producing methyl ester sulfonate (MES) surfactant made from natural resources, such jatropha oil es methyl ester. Temperature is the important factor that should be performed in MES stability. The purpose of this research is to investigate the sulfonate group caused by temperature and degradation time. The result of thermal degradation tests of Methyl Ester Sulfonates showed that at temperature of 150 oC during 72 hours influenced the degradation of sulfonate group. It was indicated by decreasing peak of sulfonate formed at the wave number of 1250 – 1150 cm-1. The increased of temperature showed decreased ability of surfactant to stabilized of emulsion and surface tension. Keywords: methyl ester sulfonates, thermal degradation