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Упит dcterms_subject_txt:total phosphorus

19 items

  • Seasonal Variations of the Zapadna Morava River Water Quality

    Nebojša Đ. Pantelić, Jana S. Štrbački, Goran Marković, Jelena B. Popović-Đorđević (2021)
    The water samples collected from four localities of the middle course of the Zapadna Morava River during 2020 were analyzed via the selected physicochemical parameters with the aim to estimate the quality of surface water. According to the results of selected physico-chemical parameters (pH, conductivity, dissolved oxygen, chemical oxygen demand, biochemical oxygen demand), analyzed surface water show a good chemical status, while the values of nutrient content (nitrate, nitrite, ammonium ion, total phosphorus) indicated the poor chemical status especially ...
    water quality, dissolved oxygen, ammonium ion, total phosphorus

  • Distribution of Uranium and Rare Elements in Radioactive Phosphate-Bearing Anomalies in Southeast Mongolia

    Boris Vakanjac, Neil Rutherford, Vesna Ristić Vakanjac, Tanita Đumić, Suzana Đorđević Milošević (2020)
    Soviet and Mongolian geologists initiated geological exploration of Mongolia for minerals after World War II (1945). These activities lasted until the breakup of the USSR in 1991. As part of this exploration systematic uranium and rare element exploration was undertaken across Mongolia. New exploration resumed in Mongolia at the beginning of the 21st century for a range of ore and mineral deposit styles including uranium, coal, base and precious metals and Fe-ore. This was generally undertaken by Western-based companies. This ...
    uran, radioaktivnost, kreda, retki elementi, fosfati, anomalije, Dornogobi

  • Refinement of waste phosphogypsum from Prahovo, Serbia: characterization and assessment of application in civil engineering

    Josip Išek, Lazar Kaluđerović, Nikola Vuković, Maja Milošević, Ivana Vukašinović, Zorica Tomić (2020)
    γ-spectrometry, brushite, chukhrovite, phosphogypsum, radionuclides, recrystallization
    ... phosphate rock, as well as being precipitated by acid digestion of natural silicates and aluminosilicates. A relatively sig- nificant amount of phosphorus in raw phosphogypsum is present in the form of brushite, as was confirmed by XRD patterns (Roode & Strydom, 1999). Brushite formed similarly to ...
    ... in the supernatant. Although the solubility of brushite is a twelfth of that of gypsum, the recrystallization did not affect significantly the phosphorus content. This may be indicative of: (1) other P-bearing phases being present; (2) replacement of SOŽ with HPO?T within the crystal structure of ...
    ... recrystallization process, the purified gypsum obtained was composed of very pure calcium sulfate dihydrate, containing only small amounts of phosphorus. There was a substantial increase in the gypsum crystal size, yielding a long-bladed crystal habit with an improved WI. Based on y-spectroscopic ...

  • English for Geology Students. 2

    Lidija Beko (2023)
    Engleski jezik
    ... towards the bottom of the chamber. Such conditions can often produce deposits of apatite, magnetite and chromite; respectively the ores from which phosphorus, iron and chromium are derived. As notedin the chapter on igneous rocks, min- erals can be formed as a result of the intrusion of molten granite ...

  • The analysis of the geothermal energy capacity for power generation in Serbia

    Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)
    Renewable Energy, Sustainability and the Environment
    ... Silicon is second highest element (first is oxygen) in the Earth's crust. It is a metalloid, under carbon in the Periodic table, between aluminum and phosphorus, having both metal and non-metal properties. It is a very important element in geothermometry, because silicates are ex- tensively distributed ...
    ... Bogati} of Ma~va. Pumped at the present rate of 200 l/s, the mentioned sources may generate 70 MWt, of which some 30 MWt the Vranjska Banja alone. Total power (for the five tested resources) is estimated at about 2200 TJ per year. Key words: geothermal water, geothermometer, power generation, Serbia ...
    ... large hydrothermal potential of the region, and for lithothermal potential; there are other theories that propose the presence of a younger intrusion. Total electric power output from this geothermal resource is 6 MWe, equal to an amount of about 13 000 tons of liquid fuel [18]. According to an estimate ...

  • The subthermal potential of karstic groundwater of Kučaj–Beljanica region in Serbia estimated by the multivariate analysis

    Ljiljana Vasić, Dragana Ž. Živojinovic, Vladana Rajaković-Ognjanović, Huang Fen, Cao Jianhua (2021)
    Earth-Surface Processes, Geology, Pollution, Soil Science, Water Science and Technology, Environmental Chemistry, Global and Planetary Change

  • Properties of fly ash and slag from the power plants

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, ...
    fly ash, slag, physical composition, chemical composition, mineral composition, X-ray diffraction method
    ... of coal and coke – Determination of sulfur trioxide (SO3) in ash from solid fuels. SRPS B.H8.327 (1989): Solid mineral fuels – Determination of phosphorus content – Reduced molybdophosphate photometric method. SRPS U.B1.018 (2005): Testig soils – Determination of particle size distribution. SPRS ...
    ... about 883.2Mt of lignite in total, has been pro- duced from the Kolubara basin, of which 866.8Mt was form open pit mines and 16.3Mt from underground mines (active until 1974). Annually, the Kolubara basin produces about 30Mt lignite, which amounts to 70% of the total coal production in Serbia. According ...
    ... „Nikola Tesla A” (NT A) and „Nikola Tesla B” (NT B). About 17 billion kWh is produced annually from Ko- lubara coal, which represents 52% of Serbia’s total electricity generation (ŽIVOTIĆ et al., 2013). In the Kostolac coal basin two thermal power plants were built. PPKO A is located on the right bank ...

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... at higher temperatures. A large content of phosphorous (1.6%) was found in AC2, although the content of ash in AC2 is very low, indicating that phosphorus disappeared during the combustion for the ash determination. Therefore, it cannot have been present as phosphate, but as phosphoric acid which ...
    ... Boca Raton, FL, USA; 2017, pp. 199-213. Puziy AM M., Poddubnaya OI I., Martinez-Alonso A, Suarez-Garcia F, Tasc6n JMD. Surface chemis- try of phosphorus-containing carbons of lignocellulosic origin. Carbon. 2005; 43: 2857—2868. https:// doi.org/10.1016/j.carbon.2005.06.014. Rudolph WW. Raman- and ...
    ... amounts of elements or functional groups in atomic % (at%) were determined with an error of > 10% as the fractions of signals normalized to the total signal area using empirical relative sensitivity factors. A charge correction was performed by setting the signal of the main C-C component of the ...

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • Hydrothermal Synthesized and Alkaline Activated Carbons Prepared from Glucose and Fructose—Detailed Characterization and Testing in Heavy Metals and Methylene Blue Removal

    Sanja Krstić, Milan Kragović, Maja Pagnacco, Vladimir Dodevski, Branka Kaluđerović, Miloš Momčilović, Ivica Ristović, Marija Stojmenović (2018)
    glukoza, fruktoza, аktivni ugalj, hidrotermalni tretman, aktivacija hidroksida, teški metali, metilen plavo
    ... 49, 5298–5311. [CrossRef] 54. Campisi, S.; Trujillo, F.J.S.; Motta, D.; Davies, T.E.; Dimitratos, N.; Villa, A. Controlling the incorporation of phosphorus functionalities on carbon nanofibers: Effects on the catalytic performance of fructose dehydration. J. Carbon Res. C 2018, 4, 9. [CrossRef] 55 ...
    ... 14.28 k2, g/(mg·min) 40.0 × 10−3 5.7 × 10−3 R2 0.99 0.98 In order to determine influence of the processes on the surface and the diffusion on the total adsorption rate, and to get additional information about binding mechanism of MB on both adsorbents, the intra-particle diffusion model was also applied ...
    ... into internal channels and vacancies. If the curves pass through zero and are linear in the entire time interval, only the diffusion influence on the total rate of the pollutant removal. Otherwise, in addition to diffusion, all the mentioned processes occur, and the overall rate is influenced by the processes ...

  • Отпад из процеса сагоревања угља као сировина за добијање елемената ретких земаља

    Бојан Земљак (2024)
    Због великог броја индустрија у којима се користе ови ресурси, глобална економија се у великој мери ослања на елементе ретких земаља. Елементи ретких земаља су есенцијална сировина — материјал за развој савремених технологија, али у односу на њихову огромну потражњу, њихово вађење је ограничено и повезано је са значајним утицајима на животну средину. Због њихове ограничене доступности, проблема који се јављају при процесима експлоатације, све више и више земаља почиње да тражи повољније могућности вађења елемената [REE] из секундарних ...
    Елементи ретких земаља, резерве, употреба, представници и методе опоравка елемената ретких земаља
    ... L.A., Boyer, T.H., Drechsel, P., Gifford, M., Hanjra, M.A., Parameswaran, P., Stoltzfus, J.., Westerhoff, P. and Rittmann, B.E., 2016. Total value of phosphorus recovery. Environmental science & technology, 50(13), p.6606-6620. [12] Weng, Z.H., Jowitt, S.M., Mudd, G.M. and Haque, N., 2013. Assessing ...
    ... acids, vitamins, and carbohydrates in soil: a review. The Scientific World Journal, 2013. [214] Oburger, E., Jones, D.L. and Wenzel, W.W., 2011. Phosphorus saturation and pH differentially regulate the efficiency of organic acid anion-mediated P solubilization mechanisms in soil. Planf and Soil, ...
    ... Efhylenediamine-N,N'-disuccinic acid . [MRI] – enrm. Magnetic resonance imaging .· IEDR] – egrn. Economically Demonstrated Resources . [TPEO] – eprz. Total rare earth oxide Canp:ikaj: IP.4:10 EGRRRRRRRRRRGRRRORRARRRRAARIRARAIRAATAARARIRAARANAARANAARARARIARARRAARARRARARARRAANAN 1 3. NOCTyTIHOCT H ...

  • Mineral Resources of Serbia: Environmental, Societal and Economic Challenges

    Vladimir Simić, Rade Jelenković, Dragana Životić (2019)
    ... Proteins, g 18.29 Magnesium, Mg 392 Total lipid (fat), g 42.16 Phosphorus, P 642 Carbohydrates, g 28.88 Potassium, K 813 Fiber total, g 27.3 Sodium, Na 30 Sugar, g 1.55 Zinc, Zn 4.34 Cholesterol, mg 0.00 Lipids, g Quantity Vitamins Quantity Fatty acids, total saturated 3.663 Niacin, mg 3.080 ...
    ... 273 thorium, 358, 359, 364 threats, 30, 32, 95 thyroid gland, 362 tin, 8 titanium, 256 tofu, 183 total cholesterol, 183 total costs, 41 381 total energy, 57, 63 total product, 61, 67, 76 tourmaline, 13 toxic effect, 114, 245, 270, 303 toxic metals, 287, 204, 303, 304 toxic ...
    ... Buckwheat is rich in carbohydrates, protein, contains all the B complex vitamins, especially niacin. Of the minerals rich in manganese, potassium, phosphorus, calcium, magnesium, sodium, iron, iodine, zinc, bromine, and contains nutritional fibers. Flavonoids rutin and quercetin from buckwheat, also ...

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... Standards and Technology, Gaithersburg, Maryland, Special Publication 846: 213. Levin E.M. and Roth R.S. (1970) The system niobium pentoxide-phosphorus pentoxide. J Solid State Chem 2: 250-261. Leonhardt J. and Weiss R. (1957) Das Kristallgitter des Kieserits MgSO4·H2O. Naturwiss 44: 338-339 ...

  • Синтеза и карактеризација керамике на бази сфена

    Jelena R. Pantić (2015-07-10)
    Механохемијска активација стехиометријске смеше реактаната TiO2, SiO2 и CaCO3 показала се као веома успешна и једноставна метода за добијање сфена (CaTiSiO5). На основу мерења релативних густина свих синтерованих узорака установљено је да максималну густину од 93,9 % имају узорци који су активирани 30 минута и синтеровани на 1200 °С. Микроструктурном анализом, тј. анализом слика синтерованих узорака активираних 30 минута, које су добијене скенирајућом електронском микроскопијом, опажа се бимодална расподела величине зрна, са просечном величином од 3 μm, односно 5 ...
    сфен, механохемија, Ритвелдова метода, оптичка спектроскопија, микроструктурна анализа, фазна трансфоpмација, чврсти раствори
    ... Standards and Technology, Gaithersburg, Maryland, Special Publication 846: 213. Levin E.M. and Roth R.S. (1970) The system niobium pentoxide-phosphorus pentoxide. J Solid State Chem 2: 250-261. Leonhardt J. and Weiss R. (1957) Das Kristallgitter des Kieserits MgSO4·H2O. Naturwiss 44: 338-339 ...

  • Природни потенцијал минералних вода Србије - Natural potential of mineral waters in Serbia

    Оливера Крунић (2021)
    минералне воде

  • Mikroelementi u uljnim šejlovima Aleksinca i njihov uticaj na životnu sredinu

    Nikoleta Aleksić (2021)
    ... Association of Official Analytical Chemists. [18] Gales, M.E.J., Julian, E.C., Kroner, R.C. (1966). Method for quantitative determination of total phosphorus in water. Journal of the American Water Works Association, 58(10), 1363-1368. [19] Bauer, A.W.W., Kirby, M.M., Sherris, J.C., Turck, M. (1966) ...
    ... Association of Official Analytical Chemists. [14] Gales, M.E.Jr., Julian, E.C., & Kroner, R.C. (1966). Method for quantitative determination of total phosphorus in water. Journal of the American Water Works Association, 58(10), 1363- 1368. [15] Garcia-Ochoa, F., Santos, V.E., Casas, J.A., Gómez, E. (2000) ...
    ... and pseudo-total digestion. Chemosphere 171, 284–293. [3] Milićević, T., Aničić Urošević, M., Relić, D., Vuković, G., Škrivanj, S., Popović, A. (2018a). Bioavailability of PTE in soil-grapevine (leaf, skin, pulp and seed) system and environmental and health risk assessment. Sci. Total Environ. 626 ...

  • Sinteza i strukturna karakterizacija mikroporoznih arsenata i fosfata

    Sabina Z. Kovač (2015-09-28)
    Predmet rada i istraživanja ove doktorske disertacije su sinteza i strukturnekarakteristike novih kristalnih arsenata i fosfata koji sadrže Mg, K, Ca, Mn, Fe, Co, Ni,Cu, Zn, Sr, Ba i druge katjone. U strukturama arsenata i fosfata, AsO4- i PO4-tetraedrinajčešće se vezuju sa tetraedarski ili oktaedarski koordinisanim katjonima prelaznihmetala formirajući otvorene strukture (slojeve ili 3D mreže) sa širokim opsegomrazličitih topologija. U šupljinama ili porama u obliku povezanih ili nepovezanihkanala, tunela, kaveza i međuslojnog prostora mogu se ugraditi različiti vanmrežni joni(obično ...
    hidrotermalna sinteza, mikroporozna jedinjenja, arsenati, fosfati,rendgenska strukturna analiza
    ... Fosfor je nemetal 15. grupe periodnog sistema, 3. periode, atomskog broja 15, i hemijskog simbola P. Naziv mu potiče od grčke reči φωσφορος (phosphorus), nosilac svetlosti. Relativna atomska masa fosfora je 30,97, a elektronska konfiguracija je [Ne] 3s23p3. Fosfor se javlja u desetak alotropskih ...

  • Rezultati ispitivanja parametara čvrstoće i dinamičkih svojstava mermera i mogućnost njihove korelacije

    Jelena Majstorović-Necković, Vladimir Čebašek, Veljko Rupar (2023)
    Ispitivanja stena kao radne sredine, odnosno materijala sa kojim se gradi, na kome se gradi i u kome se gradi, svojom složenošću zahteva njeno svestrano izučavanje po velikom broju parametara. Zadatak Mehanike stena je da što bolje upozna ponašanje stenske mase i njenu otpornost na dejstvo pritiska, zatezanja i smicanja, kao i dinamičkih svojstava. Poznavanje navedenih parametara i njihova korelacija omogućavaju pouzdaniji izbor parametara za projektovanje danas sve zahtevnijih uslova kako podzemne, tako i površinske eksploatacije. U ovom radu ...
    mermer, jednoosna čvrstoća na pritisak, čvrstoća na istezanje, brzina longitudinalnih elastičnih talasa, korelacija

  • Hronološki pregled razvoja površinske eksploatacije lignita u Srbiji

    Bojan Dimitrijević, Radmila Gaćina, Bogoljub Vučković (2023)
    U ovom preglednom radu dat je istorijski pregled razvoja površinske eksploatacije lignita na teritoriji Srbije, uz kratak osvrt na geološki nastanak i kvalitet i rezerve uglja, kao i mogućnosti korišćenja za dalju upotrebu. Kolubarski, Kostolački i Kovinski ugljeni baseni lignita u Srbiji, ne računajući Kosovsko-Metohijski i Drenički u sastavu AP Kosovo i Metohija po Rezoluciji 1244 UN, su ležišta najrasprostranjenijeg uglja - lignita u Srbiji koji se eksploatiše od druge polovine 20. veka na velikom broju površinskih kopova ...
    površinska eksploatacija ugalja, lignit, Kolubara, Kostolac, Srbija