1,720,960 research outputs found
ANALISIS LOGAM BERAT Cu DAN Cd PADA SEDIMEN DI SEKITAR PERAIRAN LAUT DANGKAL SELAT BUTON KAB. MUNA
Get PDFA research has been conducted to determine the contents of heavy metals Cu and Cd in the sediment of shallow sea water Buton Strait, Muna by using Atomic Absorption Specthrofotometric instrument. The results show that average contents of these metals in mg/Kg of dry sediment are Cu = 4,3 mg/Kg and Cd = 24,4 mg/Kg respectively. These results of Cu metal are lower than the threshold value that could given effect according to the manual of sediment quality from Febris and Werner,(1994), but results of Cd metal could be concluded that the values would be approach to the refference values. In other words, coastal environmental quality with the heavy metal in critical condition, until the special handle would be needed for reducing the accused of the metals
ISOLASI DAN IDENTIFIKASI SENYAWA ALKALOID YANG TERKANDUNG DALAM HERBA KOMFREY (Symphytum officinale L.) ASAL TANA TORAJA
Get PDFHas done research on the isolation and identification of compounds alkaloids contained in the komfrey (Symphytum officinale L.) from Toraja. The aim of this research is to determine alkaloid contained in komfrey with infra red spectrophotometry the results from two dimensional thin layer Chromatography a fraction using silica gel GF254 stationary phase and mobile phase chloroform: methanol (8:2) form a blue color staining with Rf value of 0.82 and a positive result is suspected alkaloids. From the results of identification using infrared spectroscopy, results show komfrey suspected to contain alkaloid compounds. mean 0,81 %
Optimalisasi Kalsium Karbonat Dari Cangkang Telur Untuk Produksi Pasta Komposit
Get PDFEgg shell is a household waste which can be used to produce a composite paste, as it contains around 90% calsium carbonate (CaCO3) as the main composition. This research aims to determine the optimum weight of egg shell powder in composite paste production. This research is conducted by determining the calsium carbonate content beforehand by EDTA titration and the determination of the contain of calsium by using atomic absorption spectroscopy (AAS), then the determination of the optimum weight of shell powder by varying the shell powder and baking soda. The results of the research that has been done that the content of calsium carbonate in the shell of eggs was 92,57% and calsium at 28%. While the optimum weight for the shell powder manufacture composite paste which is 3 grams with a ratio of 3,0 (Ca) : 7,0 (BS), in which the pH obtained is 9. This is in a accordance by SNI that the pH value of the composite paste is 4,5–10,5 and is semisolid form
Analisis Kandungan Zat Besi (Fe) Pada Buah Kelor dan Daun Kelor (Moringa Oleifera) yang Tumbuh di Desa Matajang Kec. Dua Boccoe Kab. Bone
Get PDFThis research is a kind of experiment research by analyze mineral such as iron essence (Fe) that are needed as a suplement in our body. In this research are used the kelor’s fruits and kelor’s leaf as specimen with the aim to know the iron essence (Fe) that content in the specimen. The content of iron essence (Fe) in specimen are used by Atomic Absorption Spectroscopy (AAS) method. The kelor’s fruits, the average iron essence (Fe) content in A place is 2,50 mg/100 gram specimen, B place is 3,20 mg/100 gram specimen, C place si 3,59 mg/100 gram specimen and D place is 4,51 mg/100 gram specimen. Than the kelor’s leaf, the average iron essence (Fe) content in A place is 5,89 mg/100 gram specimen, B place 5,73 mg/100 gram specimen, C place is 6,02 mg/100 gram specimen and D place is 6,21 mg/100 gram specimen
Delignifikasi Ampas Tebu untuk Pembuatan Pulp Rendemen Tinggi dengan Proses Peroksida Alkali
Get PDFDelignification is of lignin termination process with particular solvent that produce high yield the pulping. Alkaline peroxide process produces low kappa pulp. Bagasse contains 42-53% cellulose was used as a base material for pulping. Delignification of bagasse making of high yield pulp by the process of Peroxide Alkali has been done by varying the concentration of NaOH (4%, 5%, 6%, 7%, 8%) and length of cooking 1,5 hours in the temperature 121 °C and pressure 0,11 atm. The aim of the study is to obtain the optimum length of cooking the making of high yield of bagasse by process Peroxide Alkali. The method of the study is delignification with process of cooking using autoclave. The result of the study indicates that addition of concentration NaOH affects the pulp yield, number of permanganate and physical characteristic of papers sheet. The highest yield pulp obtained is 53,97% observed at the concentration of NaOH 5%. Whereas, the lowest number of permanganate is 3, 98 obtained by adding the concentration of NaOH 8%
Hidroksiapatit dari Tulang Ikan Tuna Sirip Kuning (Tunnus albacores) dengan Metode Presipitasi
Get PDFIndonesia as one of the biggest tuna fish produsers in the world, produce tuna fish bones large enough. Since tuna fish bone contain high calcium it is potentially to be the raw material of hydroxyapatite. Hydroxyapatite are inorganic compounds constituent of bones and teeth has the moleculer formula Ca5(PO4)3OH. Synthesis of hydroxyapatite can be done with precipitation method through tuna fish bone calcination process at the temperature 900°C for 5 hours to obtain calcium compounds in the form of calcium oxide. Calcium wich has been obtained added phosphoric acid 0,6 M with flow rate/rapid 1 mL/minute. Controlled synthesis process parameters are pH 10 of solution. Yield of hydroxyapatite generated after synthesis with of the precipitation time 12 hours are of 91.15%. hydroxyapatite product obtained was analyzed by FTIR(Fourier Transform Infrared) and XRD (X-Ray Diffraction). FTIR analysis indicate the presence of OH groups, PO4 and CO3. Based on the resulting diffraction of XRD analysis, crystallite size obtained each of 211.29 nm structure is hexagonal. Scherrer method was used to obtain crystallite size
Pengaruh Penyimpanan Pada Suhu Rendah (Freezer -3oC) Terhadap Kandungan Air dan Kandungan Lemak pada Ikan Lemuru (Sardinella longiceps)
Get PDFOne of the peaceful and best pickling methode to maintain freshness of product is depository at low temperature (freezer). Through depository of process industrial balance and availability of processing result of fishery will remained to be taken care of. Depository of fish raw material specially of fish flesh expected will be more be economic in course of depository at low temperature (freezer). The fat rate before is depository (0 day) that is 5,14%, while at depository 1 day until 3 day of it fat is 9,43%, 14,70%, 15,30%, and to 4 until 7 days the fat content is downhill that is 7, 15%, 5, 50%, 3,96%. The rate irrigate before is depository (0 day) that is 26, 96%. While at depository 1 day until 3 day of its water that is 27, 87%, 27, 44%, 27,20%, and depository to 4 day until 7 days water content mount that is 27,94%, 27,97%, 28,10%, 28,40%. Depository of lamuru fish flesh (sardinella longiceps) conducted by at low temperature (freezer -3oC) during 7 day can cause degradation quality of good fish flesh of fat rate and also lamuru fish flesh colour changing from squeezing colour to become to squeeze to turn pale. While its water content is depository longer progressively increase
ANALYSIS OF THE SEASONAL IMPACT ON ISOTOPIC BASELINES OF DISSOLVED INORGANIC CARBON (DIC) IN COASTAL WATERS SPERMONDE, SOUTH SULAWESI
Get PDFStable carbon isotopes have been commonly used as indicators for assessing environmental changes in aquatic ecosystems. They can be used to study the dynamics of organic matter as for understanding the overall functioning of the ecosystem, the connectivity of estuaries with terrestrial and marine coastal habitats. The objective of this study is determining the seasonal natural effects over isotopic (13C/12C) baselines in monitoring CO2 storage in dissolved inorganic materials in Spermonde waters on the west coast of South Sulawesi to some outermost island. The results show that the stable carbon isotopic of DIC (d13C-DIC) in the wet season varied between -5.36 ‰ and -7.74 ‰. These value are higher than on dry season (-4.34 ‰ to -6.82 ‰). Likewise, DIC concentration in the rainy season ranged between 9.5 mg C/L and 11.7 mg C/L, while in the dry season it varied from 8.5 mg C/L to 9.3 mg C/L. The d13C-DIC and DIC concentrations decreased towards offshore, up to some of the outer islands. Increasing in the d13C-DIC in Spermonde waters indicate that the DIC is most likely enriched by atmospheric CO2(g), which is outnumbered those of aquatic photosynthesis. This study shows that different levels and composition of d13C-DIC stretch along different rivers are attributable to the varying landscapes and quality of organic matters
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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