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Journal articles on the topic 'Carbonate component'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Nikiforov, Anatoly V., Elena O. Dubinina, Nikolay A. Polyakov, Amina M. Sugorakova, and Aylan K. Khertek. "Influence of Host Marble Rocks on the Formation of Intrusive Alkaline Rocks and Carbonatites of Sangilen (E. Siberia, Russia)." Minerals 11, no. 7 (2021): 666. http://dx.doi.org/10.3390/min11070666.

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The study of the O and C isotope composition of calcite from nepheline syenites, ijolites and carbonatites of the Chik intrusion and the intrusions of the Erzin–Tarbagatay group of Sangilen (Eastern Siberia, Russia) showed derivation from alkaline melts enriched with a carbonate component from the host marbleized sedimentary rocks. The calculations showed that about 40% of the initial mass of carbonates involved in the interaction with silicate melts have remained after decarbonation. During the assimilation of the carbonate, an oxygen isotope exchange took place between the residual carbonate

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2

Wang, Xiao-Jun, Li-Hui Chen, Albrecht W. Hofmann, et al. "Recycled ancient ghost carbonate in the Pitcairn mantle plume." Proceedings of the National Academy of Sciences 115, no. 35 (2018): 8682–87. http://dx.doi.org/10.1073/pnas.1719570115.

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The extreme Sr, Nd, Hf, and Pb isotopic compositions found in Pitcairn Island basalts have been labeled enriched mantle 1 (EM1), characterizing them as one of the isotopic mantle end members. The EM1 origin has been vigorously debated for over 25 years, with interpretations ranging from delaminated subcontinental lithosphere, to recycled lower continental crust, to recycled oceanic crust carrying ancient pelagic sediments, all of which may potentially generate the requisite radiogenic isotopic composition. Here we find that δ26Mg ratios in Pitcairn EM1 basalts are significantly lower than in n

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3

Rosatelli, G., F. Wall, and M. J. Le Bas. "Potassic glass and calcite carbonatite in lapilli from extrusive carbonatites at Rangwa Caldera Complex, Kenya." Mineralogical Magazine 67, no. 5 (2003): 931–55. http://dx.doi.org/10.1180/0026461036750152.

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AbstractThe ∽16 Ma Rangwa Caldera Complex, part of the large Kisingiri nephelinite-carbonatite volcano, Homa Bay District, western Kenya (0º34’S; 34º09’E) contains carbonatitic lapilli and ash tuffs, agglomerate and tuffisite, and a number of intrusive calcite carbonatites. A detailed petrographic and electron microprobe study has been performed on 20 fresh samples from the collection at The Natural History Museum, London.Most of the juvenile lapilli and ash particles are either predominantly composed of devitrified silicate glass (now biotite/phlogopite but probably also originally potassic s

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4

Ren, Fu Zeng, and Yang Leng. "Carbonated Apatite, Type-A or Type-B?" Key Engineering Materials 493-494 (October 2011): 293–97. http://dx.doi.org/10.4028/www.scientific.net/kem.493-494.293.

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Carbonated apatite, the basic mineral component in human hard tissues and an important bioceramic material, has been extensively studied. However, its atomic arrangements in apatite crystal structure and its experimental characterization are still not lack of debating. We analyzed infrared (IR) vibrational spectroscopy for carbonated apatite determinations, by comparatively studying the IR spectra of hydroxyapatite and of surface carbonate absorption, biological apatites (human enamel, human cortical bone, and two animal bones) and carbonated apatite. The carbonated apatite samples were sythes

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5

Arefiev, Anton V., Anton Shatskiy, Altyna Bekhtenova, and Konstantin D. Litasov. "Phonolite-Carbonatite Liquid Immiscibility at 3–6 GPa." Minerals 13, no. 3 (2023): 443. http://dx.doi.org/10.3390/min13030443.

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Liquid immiscibility plays an important role in the formation of carbonatites and associated alkaline Si-undersaturated magmas. Experiments in the sodium carbonate-aluminosilicate systems suggest that the carbonate-silicate miscibility gap is limited by crustal and shallow mantle pressures (up to 2.5 GPa). Unlike in the potassium-rich carbonate-aluminosilicate systems, the carbonate-silicate miscibility gap was established at pressures of 3.5–6 GPa. It is therefore interesting to elucidate the immiscibility range under intermediate pressures, corresponding to 100–200 km depths. Here we conduct

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6

Dubinina, E. O., A. S. Morozova, I. T. Rass, and A. S. Avdeenko. "OXYGEN ISOTOPE FRACTIONATION IN THE SILICATE-CARBONATE SYSTEM DURING THE ROCK FORMATION OF THE KOVDOR MASSIF (KOLA PENINSULA)." Доклады Российской академии наук. Науки о Земле 512, no. 2 (2023): 212–18. http://dx.doi.org/10.31857/s268673972360145x.

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For the first time the δ18O values both in carbonate and non-carbonate (Ol, Phl, Mt) components of the rocks (calcite carbonatites, phoscorites, ijolites, turyaites) of the Kovdor massif were studied to clarify the role of contamination processes, retrograde exchange, and high-temperature fractionation in the igneous system. It has been established that the processes of crustal contamination are not recorded in the isotopic characteristics of the silicate part of the rocks, and the δ18О values of olivine, phlogopite, and magnetite are lowered compare to the compositions attributed to equilibri

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7

Azzaro, E., A. Bellanca, and R. Neri. "Mineralogy and geochemistry of Mesozoic black shales and interbedded carbonates, southeastern Sicily: evaluation of diagenetic processes." Geological Magazine 130, no. 2 (1993): 191–202. http://dx.doi.org/10.1017/s0016756800009857.

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AbstractUpper Triassic/Lower Jurassic organic-rich shales and interbedded carbonates (Rhaetian → Sinemurian) are widespread in the subsurface of southeastern Sicily where important oil fields have been found hosted in Triassic reservoirs. Core samples from wells drilled offshore and onshore were studied from petrographie and geochemical viewpoints.In the Hettangian/Sinemurian shale-carbonate sequences, which accumulated in a rapidly subsiding basin, the micritic aragonitic mud is still largely preserved. Mixed-layer I/S has remained randomly interstratified to a depth > 4000 m. Diagenetic c

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8

Mitchell, Neil C., Rui Quartau, Sandra Moreira, et al. "An equation for deriving spatial variations in carbonate production rates from sediment deposition rates and dilution: Application to Santa Maria Island, Azores." Journal of Sedimentary Research 92, no. 11 (2022): 1003–21. http://dx.doi.org/10.2110/jsr.2022.006.

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Abstract Knowledge of how carbonates are produced on shelves is needed for working out how these “carbonate factories” generate stratigraphy by providing particles for potential export or local deposition. Production rates can be derived straightforwardly in low-energy environments from one-dimensional analysis (age–depth variations) but rates are less easily derived for high-energy hydrodynamical environments where particles are transported away from their sites of production. This particularly affects knowledge of spatial variations in production rates, needed for working out controlling inf

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9

Shen, Zhanhui, Jialu Shi, Shuzhan Zhang, Jing Fan, and JianSheng Li. "Effect of optimized three-component antiscalant mixture on calcium carbonate scale deposition." Water Science and Technology 75, no. 2 (2016): 255–62. http://dx.doi.org/10.2166/wst.2016.512.

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The mixture of 1-hydroxyethane-1,1-diphosphonic acid (HEDP), and polyacrylic acid (PAA) and synthesized hydrolyzed polymaleic anhydride (HPMA) was optimized by using simplex lattice of Design-Expert software through calcium carbonate precipitation method. The optimum mass ratio of HEDP, PAA and synthesized HPMA was obtained at 10/10/80, which showed excellent performance on controlling calcium carbonate deposition. The antiscale efficiency of the optimum mixture was 84% and 95%, respectively, in the calcium carbonate precipitation test and the calcium carbonate scale deposit test. The optimum

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10

Jarot, Raharjo, Andanastuti Muchtar, Wan Ramli Wan Daud, Norhamidi Muhamad, and Edy Herianto Majlan. "Fabrication of Dense Composite Ceramic Electrolyte SDC-(Li/Na)₂CO₃." Key Engineering Materials 447-448 (September 2010): 666–70. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.666.

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Composite electrolytes made of samarium-doped cerium (SDC, Ce0.8Sm0.2O1.9) and (67 mol% Li/ 33mol% Na)2CO3 carbonate salts were investigated in relation to their structure, morphology and porosity of the electrolyte. The fabrication of the SDC–(Li/Na)2CO3 composite electrolytes were achieved in two steps: step (1) preparation of the samarium-doped cerium powders by sol-gel; step (2) mixing of the samarium-doped cerium with carbonates in various compositions by solid state reaction. The electrolyte pellets were compacted at different pressures (25 and 50 MPa) and sintered at 600oC, 700oC and 80

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11

Toffolo, Michael B. "Radiocarbon Dating of Anthropogenic Carbonates: What Is the Benchmark for Sample Selection?" Heritage 3, no. 4 (2020): 1416–32. http://dx.doi.org/10.3390/heritage3040079.

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Anthropogenic carbonates are pyrotechnological products composed of calcium carbonate, and include wood ash, lime plaster/mortar, and hydraulic mortar. These synthetic materials are among the first produced by humans, and greatly influenced their biological and cultural evolution. Therefore, they are an important component of the archeological record that can provide invaluable information about past lifeways. One major aspect that has been long investigated is the possibility of obtaining accurate radiocarbon dates from the pyrogenic calcium carbonate that makes up most of these materials. Th

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12

Dasgupta, Somnath, P. K. Bhattacharya, H. Banerjee, M. Fukuoka, N. Majumdar, and Supriya Roy. "Calderite-rich garnets from metamorphosed manganese silicate rocks of the Sausar Group, India, and their derivation." Mineralogical Magazine 51, no. 362 (1987): 577–83. http://dx.doi.org/10.1180/minmag.1987.051.362.12.

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AbstractManganiferous garnets occur in metamorphosed Mn silicate-oxide and silicate-carbonate-oxide rocks of the Sausar Group, India. The garnets of the carbonatic rock show maximum calderite content (∼50 mole%). Increased Ca content in the bulk has been observed to be sympathetically related to the concentration of calderite, rather than the expected andradite component of the garnets. This is the consequence of the preferential partitioning of Ca in coexisting pyroxmangite and/or carbonate. Petrochemical characteristics of the diverse assemblages in response to the physical conditions of met

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13

Meléndez, Jaisiel, Michael North, and Pedro Villuendas. "One-component catalysts for cyclic carbonate synthesis." Chemical Communications, no. 18 (2009): 2577. http://dx.doi.org/10.1039/b900180h.

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14

Safira, Amanda, Dina Yulianita, and Widya Utama. "Fluid Substitution Analysis Using Gassmann’s Equation Modification on Carbonate Environment." Pakistan Journal of Scientific Research 1, no. 2 (2021): 8–12. http://dx.doi.org/10.57041/pjosr.v1i2.6.

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Gassmann’s equation can be used to determine the velocity of compressional waves that pass through rocks with various pore fluid contents, using fluid substitution concept, but is generally applied to certain conditions only (physical rock properties). Carbonate rock has properties in contrary of Gassmann’s assumption; is a heterogenic, anisotropic rock and does not have a well-interconnected pores. In this research, secondary data from laboratory measurements are used, consisting of carbonate rocks (limestone and dolomite) to test modified Gassmann’s equation on carbonate rocks. Two approache

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15

García-Montero, L. G., I. Valverde-Asenjo, P. Díaz, and C. Pascual. "Statistical patterns of carbonates and total organic carbon on soils of Tuber rufum and T. melanosporum (black truffle) brûlés." Soil Research 47, no. 2 (2009): 206. http://dx.doi.org/10.1071/sr08084.

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The ascocarps of several truffle species, such as Tuber rufum, are harvested in T. melanosporum brûlés; these species reduce T. melanosporum production. Some authors argue that this competition might be due to the evolution of organic matter in the soil. However, soil conditions in brûlés have yet to be clarified, and most studies on T. melanosporum fail to supply statistical data. We propose a study of 40 soils to compare the values for total organic carbon (TOC), pH, and carbonates inside the brûlés with the values for the outer edges of the same brûlés, where T. rufum ascocarps are collecte

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16

Rose, Catherine V., Samuel M. Webb, Matthew Newville, et al. "Insights into past ocean proxies from micron-scale mapping of sulfur species in carbonates." Geology 47, no. 9 (2019): 833–37. http://dx.doi.org/10.1130/g46228.1.

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Abstract Geological reconstructions of global ocean chemistry and atmospheric oxygen concentrations over Earth history commonly rely on the abundance and stable isotopic composition (δ34S) of sulfur-bearing compounds. Carbonate-associated sulfate (CAS), sulfate bound within a calcium carbonate mineral matrix, is among the most commonly interrogated sulfur mineral phases. However, recent work has revealed variability in δ34SCAS values that cannot be explained by evolution of the marine sulfate reservoir, challenging the common interpretation that CAS is inherently a high-fidelity record of seaw

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17

Almukarrama and Yusril Yusuf. "Development Carbonated Hydroxyapatite Powders from Oyster Shells (Crassostrea gigas) by Carbonate Content Variations." Materials Science Forum 975 (January 2020): 76–81. http://dx.doi.org/10.4028/www.scientific.net/msf.975.76.

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Carbonated hydroxyapatite (CHAp) is an inorganic mineral that more closely resembles the main component of composing human hard tissue in 2-8 wt% carbonate content. CHAp powders have been synthesized from oyster shells using the precipitation method. Oyster shells are one type of shellfish from the bivalve class which is rich in calcium carbonate content. In this research, CaO from oyster shells obtained from the decomposition process of CaCO3 was used as a source of calcium and diammonium hydrogen phosphate and ammonium bicarbonate as well as a precursor of phosphate and carbonate, respective

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18

Li, Bao An, Xue Jing Liu, and Xiao Fei Gao. "Study on Calcium and Magnesium Fouling of Vacuum Membrane Distillation." Advanced Materials Research 479-481 (February 2012): 240–44. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.240.

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In this paper, calcium and magnesium fouling on membrane distillation process was investigated. The effect of less soluble salts with single component or multi component on flux and membrane fouling was examined, by means of synthesizing seawater. The results showed that the fouling caused by calcium carbonate and calcium sulfate was mainly formed by the attachment of the insoluble substance on the fibers. The calcium sulfate caused the blocking at inlet hole of the module. If there were less soluble salts with multi components in the feed, calcium carbonate was the main form of the fouling.

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19

Kapustin, V. I., I. P. Li, N. E. Kozhevnikova, and E. F. Khudaigulova. "Technology of synthesis and electronic structure of triple barium–strontium–calcium carbonates for cathodes of microwave devices." Russian Technological Journal 10, no. 6 (2022): 60–69. http://dx.doi.org/10.32362/2500-316x-2022-10-6-60-69.

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Objectives. Triple barium–strontium–calcium carbonates of various grades are widely used for depositing oxide coatings on cathodes of electrovacuum devices. Of all types of cathodes used in electrovacuum devices, oxide cathodes are among the most common, due to combining efficiency, durability, operation at relatively low temperatures, and a relatively low cost. The aims of this work were to: create a technology for the synthesis of triple barium–strontium–calcium carbonates with nonequilibrium phase compositions that comprise the triple carbonate proper and a pure barium carbonate phase; deve

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20

Yuzawa, Masayuki, Kazuhiko Nakano, Takatoshi Kumamaru, et al. "IS THE CRYSTAL COMPONENT OF THE HUMAN URINARY CALCULUS INCLUDING CARBONATE CALCIUM CARBONATE?" Japanese Journal of Urology 99, no. 6 (2008): 681–87. http://dx.doi.org/10.5980/jpnjurol1989.99.681.

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21

Huang, Kang-Jun, Fang-Zhen Teng, Bing Shen, et al. "Episode of intense chemical weathering during the termination of the 635 Ma Marinoan glaciation." Proceedings of the National Academy of Sciences 113, no. 52 (2016): 14904–9. http://dx.doi.org/10.1073/pnas.1607712113.

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Cryogenian (∼720–635 Ma) global glaciations (the snowball Earth) represent the most extreme ice ages in Earth’s history. The termination of these snowball Earth glaciations is marked by the global precipitation of cap carbonates, which are interpreted to have been driven by intense chemical weathering on continents. However, direct geochemical evidence for the intense chemical weathering in the aftermath of snowball glaciations is lacking. Here, we report Mg isotopic data from the terminal Cryogenian or Marinoan-age Nantuo Formation and the overlying cap carbonate of the basal Doushantuo Forma

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22

Assakunova, Bubuzuura T., Bakytbek B. Barpiev, Beishenbek S. Ordobaev, Zhazgul Amanzhan-kyzy, and Shirin S. Abdykeeva. "The use of natural clay-carbonate gypsum in the production of sulfate-containing cements." XXI century. Technosphere Safety 5, no. 4 (2020): 346–55. http://dx.doi.org/10.21285/2500-1582-2020-4-346-355.

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The purpose of the article is to study the raw materials located in the deposits of Kyrgyzstan and used in the production of sulfate-containing cements. The article aims to identify features of the technological process of clinker formation. An analysis of deposits of gypsum raw materials in Kyrgyzstan was carried out. For the most common raw materials of limestones, their chemical and mineralogical composition was studied using the chemical, derivatographic and X-ray methods. By calculating raw mixtures, a charge was produced for obtaining sulfate-containing cement from limestone of the Tashk

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23

Mikhailov, N. N., O. M. Ermilov, and L. S. Sechina. "Wettability change of reservoir rocks during the adsorption of asphaltenes on the interstitial surface." Actual Problems of Oil and Gas, no. 32 (April 21, 2021): 3–15. http://dx.doi.org/10.29222/ipng.2078-5712.2021-32.art1.

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The influence of adsorbed polar components on the change in the wettability of terrigenous and carbonate reservoirs of oil and gas condensate fields was studied. The regularities of hydrophobization of the internal space of the reservoir in two cases are established: the effect of only the asphaltene component and the effect of the asphaltene component together with the oil-resinous components. The role of associations of polar components in the change of wettability is shown.

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Martin, I. A., L. Ainsaar, and A. Lepland. "Palaeozoic carbon isotope excursions and carbonate component analysis." Estonian Journal of Earth Sciences 72, no. 1 (2023): 145. http://dx.doi.org/10.3176/earth.2023.36.

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25

Gong, Qing, Huadong Luo, Jin Cao, et al. "Synthesis of Cyclic Carbonate From Carbon Dioxide and Epoxide Using Amino Acid Ionic Liquid Under 1atm Pressure." Australian Journal of Chemistry 65, no. 4 (2012): 381. http://dx.doi.org/10.1071/ch11462.

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Herein, we report an effective synthesis of cyclic carbonates by cycloaddition of carbon dioxide to epoxide using a modified amino acid ionic liquid as catalyst under 1 atm pressure. With triethylamine as co-catalyst, the catalytic activity of the l-proline based ionic liquid was greatly enhanced, and up to 97 % isolated yield of cyclic carbonate was achieved at 90°C under atmospheric pressure without organic solvent and metal component.

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Taillades, Gilles, Ismahan Hachemi, Paul Pers, Julian Dailly, and Mathieu Marrony. "Synthesis and Characterizations of Barium Zirconate–Alkali Carbonate Composite Electrolytes for Intermediate Temperature Fuel Cells." Journal of Composites Science 5, no. 7 (2021): 183. http://dx.doi.org/10.3390/jcs5070183.

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Composite ionic conductors for intermediate temperature fuel cells (ITFC) were produced by a combination of yttrium-substituted barium zirconate (BaZr0.9Y0.1 O2.95, BZY) and eutectic compositions of alkali carbonates (Li2CO3, Na2CO3, and K2CO3, abbreviated L, N, K). These materials were characterized by X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. The combination of BZY with alkali metal carbonate promotes the densification and enhances the ionic conductivity, which reaches 87 mS·cm−1 at 400 °C for the BZY–LNK40 composite. In addition, the increase of the conduc

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Wang, Letian, Ubong Jerome Etim, Chenchen Zhang, Lilac Amirav, and Ziyi Zhong. "CO2 Activation and Hydrogenation on Cu-ZnO/Al2O3 Nanorod Catalysts: An In Situ FTIR Study." Nanomaterials 12, no. 15 (2022): 2527. http://dx.doi.org/10.3390/nano12152527.

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CuZnO/Al2O3 is the industrial catalyst used for methanol synthesis from syngas (CO + H2) and is also promising for the hydrogenation of CO2 to methanol. In this work, we synthesized Al2O3 nanorods (n-Al2O3) and impregnated them with the CuZnO component. The catalysts were evaluated for the hydrogenation of CO2 to methanol in a fixed-bed reactor. The support and the catalysts were characterized, including via in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The study of the CO2 adsorption, activation, and hydrogenation using in situ DRIFT spectroscopy revealed the d

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28

Antoshkina, Anna. "Microspherulites in a biogenic-abiogenic carbonate formation (the Lower Maeotian carbonates, Cape Kazantip, the Kerch Peninsula)." Vestnik of geosciences, no. 11 (December 27, 2023): 26–36. http://dx.doi.org/10.19110/geov.2023.11.3.

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The results of the study of calcite microspherulites in carbonate breccia formed at the junction of biohermal and bioclastic limestones (Lower Maeotian, Cape Kazantip, Kerch Peninsula), the nature of which is still being discussed, are presented. The following analytical methods were used: chemical carbonate, gas chromatography, Raman spectroscopy, electron microscopy with EDS, isotope. The studies resulted in the following: the presence in the fossilized biofilms of the pelitomorphic matrix and microspherulites of framboidal pyrite, halite, barite, celestine, dolomite-calcite, hematite and ma

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Francés-Poveda, Enrique, Marta Navarro, Monserrat Beroíza-Duhart, et al. "Effective One-Component Organocatalysts for Eco-Friendly Production of Cyclic Carbonates." Reactions 6, no. 1 (2025): 8. https://doi.org/10.3390/reactions6010008.

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One-component or bifunctional organocatalysts are some of the most capable compounds to perform the synthesis of cyclic carbonates from epoxides and carbon dioxide (CO2) since the presence of a co-catalyst is not required. In this study, we designed, synthesized, and evaluated five halogenated compounds as bifunctional organocatalysts for this catalytic transformation. Among them, 1,3-dimethylimidazolium iodide (1) exhibited the highest catalytic efficiency, enabling the synthesis of a broad range of monosubstituted cyclic carbonates with diverse functional groups under mild conditions (80 °C,

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Da, Jiawei, Yi Ge Zhang, Gen Li та Junfeng Ji. "Aridity-driven decoupling of δ13C between pedogenic carbonate and soil organic matter". Geology 48, № 10 (2020): 981–85. http://dx.doi.org/10.1130/g47241.1.

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Abstract Pedogenic carbonate is an invaluable archive for reconstructing continental paleoclimate and paleoecology. The δ13C of pedogenic carbonate (δ13Cc) has been widely used to document the rise and expansion of C4 plants over the Cenozoic. This application requires a fundamental presumption that in soil pores, soil-respired CO2 dominates over atmospheric CO2 during the formation of pedogenic carbonates. However, the decoupling between δ13Cc and δ13C of soil organic matter (δ13CSOM) have been observed, particularly in arid regions, suggesting that this presumption is not always valid. To ev

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31

Kunio, Ishikawa. "Carbonate Apatite Bone Replacement." Key Engineering Materials 587 (November 2013): 17–20. http://dx.doi.org/10.4028/www.scientific.net/kem.587.17.

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Inorganic component of bone is not hydroxyapatite but carbonate apatite. Although pure carbonate apatite (CO3Ap) has not been prepared due to the limited thermal stability of CO3Ap, dissolution - precipitation method using precursor block allows fabrication of pure CO3Ap. Fabrication of CO3Ap, cell response, tissue response and improvement of CO3Ap will be discussed.

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Novoselov, Alexey G., Yulia I. Ershova, Inna N. Novoselova, and V. K. Klassen. "Study of the Carbonate Component Raw Material Mixture Effect on the Clinker Grindability." Materials Science Forum 974 (December 2019): 261–66. http://dx.doi.org/10.4028/www.scientific.net/msf.974.261.

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The carbonate components effect of raw materials - chalk and limestone on the clinker properties has been determined. Studies have been carried out on the raw mix these components partial replacement with the Oskol electrometallurgical plant slag in the amount of 10 and 20%. The maximum decrease in the carbonate component amount was 10%. The grinding clinker individual stages, characterized by the material destruction certain processes have been analyzed. It has been established that by reducing the chalk content in the raw mix and replacing it with the Oskol electrometallurgical plant slag, t

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Zhang, Fangfu, Huifang Xu, Evgenya S. Shelobolina, Hiromi Konishi, and Eric E. Roden. "Precipitation of low-temperature disordered dolomite induced by extracellular polymeric substances of methanogenic Archaea Methanosarcina barkeri: Implications for sedimentary dolomite formation." American Mineralogist 106, no. 1 (2021): 69–81. http://dx.doi.org/10.2138/am-2020-7381.

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Abstract A correlation between methanogenesis and dolomite formation has been reported; however, the mechanism underlying this association is not fully understood. In this study, we conducted forced carbonate precipitation experiments at room temperature in calcite-seeded Ca/Mg carbonate solutions containing either purified non-living biomass or bound extracellular polymeric substances (EPS) of the methanogen Methanosarcina barkeri. Purified non-living biomass and bound EPS was used so as to avoid the possible influence of the complex components of the growing microbial culture on carbonate cr

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DURYTSKYI, Serhii, and Kateryna PUSHKAROVA. "Features of sulfate and carbonate activation of plasticized fly-ash cement binder systems." Transfer of innovative technologies 7, no. 2 (2025): 3–13. https://doi.org/10.32347/tit.2024.7.2.01.01.

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Abstract. The article is devoted to the study of the features of sulfate and carbonate activation of plasticized fly ash-cement binder systems In the course of research, the principles of composite build of plasticized ash-filled binding compositions containing 20-40% of OPC and coal by-product by increased operational characteristics have been proven. It is shown that the use of complex organo-mineral additives in fly ash-cement compositions, which contain a mixture of carbonate and sulfate compounds as a mineral component, and a plasticizing additive of the polycarboxylate type as an organic

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Astakhov, Mikhail V., Ludmila A. Puntusova, Ruslan R. Galymzyanov, et al. "Multicomponent non-aqueous electrolytes for high temperature operation of supercapacitors." Butlerov Communications 61, no. 1 (2020): 67–75. http://dx.doi.org/10.37952/roi-jbc-01/20-61-1-67.

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Multicomponent non-aqueous electrolytes based on cyclic carbonates and tetraethylammonium tetrafluoroborate have been developed for the operation of supercapacitors at elevated temperatures. Propylene carbonate, which has a high dielectric constant and a high boiling point, was used as the main solvent of electrolytes. However, a significant drawback of propylene carbonate is its high viscosity, which leads to decrease in the electrical conductivity of electrolytes based on it compared to electrolytes based on acetonitrile. To increase the electrical conductivity, an additional component was i

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Kos, Tatiana, Inha Kuznietsova, Tamila Sheiko, et al. "An improved method for determining the mass fraction of calcium carbonate in the carbonate bedrock." Potravinarstvo Slovak Journal of Food Sciences 15 (September 27, 2021): 877–90. http://dx.doi.org/10.5219/1591.

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In the article it is offered to enter in the technological audit of the lime department of sugar factory the adjusted technique of the definition of the maintenance of calcium carbonate in carbonate breed. For this purpose, a complete chemical analysis of limestone was performed, which includes determination of moisture content, impurities insoluble in hydrochloric acid, the amount of one and a half oxides of aluminum and iron, calcium carbonate (advanced method), and magnesium carbonate, calcium sulfate, alkali metal oxides, potassium, and sodium. The obtained experimental data are summarized

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Rode, Claudia, Ralf Wyrwa, Juergen Weisser, et al. "A Novel Resorbable Composite Material Containing Poly(ester-co-urethane) and Precipitated Calcium Carbonate Spherulites for Bone Augmentation—Development and Preclinical Pilot Trials." Molecules 26, no. 1 (2020): 102. http://dx.doi.org/10.3390/molecules26010102.

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Polyurethanes have the potential to impart cell-relevant properties like excellent biocompatibility, high and interconnecting porosity and controlled degradability into biomaterials in a relatively simple way. In this context, a biodegradable composite material made of an isocyanate-terminated co-oligoester prepolymer and precipitated calcium carbonated spherulites (up to 60% w/w) was synthesized and investigated with regard to an application as bone substitute in dental and orthodontic application. After foaming the composite material, a predominantly interconnecting porous structure is obtai

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Markevich, E., G. Salitra, A. Rosenman, Y. Talyosef, F. Chesneau, and D. Aurbach. "Fluoroethylene carbonate as an important component in organic carbonate electrolyte solutions for lithium sulfur batteries." Electrochemistry Communications 60 (November 2015): 42–46. http://dx.doi.org/10.1016/j.elecom.2015.08.004.

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Rojas Álvarez, Oscar Eduardo, María Inés Nicolás Vázquez, Jose Oñate-Garzón, and Carlos A. Arango. "Validation by Molecular Dynamics of the Major Components of Sugarcane Vinasse, On a Surface of Calcium Carbonate (Calcite)." Molecules 26, no. 8 (2021): 2353. http://dx.doi.org/10.3390/molecules26082353.

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There is ongoing interest in the alcohol industry to significantly reduce and/or add value to the liquid residue, vinasse, produced after the distillation and rectification of ethanol from sugar cane. Vinasse contains potassium, glycerol, and a protein component that can cause environmental issues if improperly disposed of. Currently, some industries have optimized their processes to reduce waste, and a significant proportion of vinasse is being considered for use as an additive in other industrial processes. In the manufacture of cement and asphalt, vinasse has been used in the mixtures at lo

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Ogah, C. O., K. U. Nwaeze, and O. O. Adetifa. "Analysis of Brown and White Chicken Eggshells for Content of Calcium Carbonate." Journal of Basic and Social Pharmacy Research 2, no. 2 (2021): 27–34. http://dx.doi.org/10.52968/27457333.

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Background: An eggshell is the hard outer covering of an egg that serves to protect it from damage, microbial contamination and desiccation. The major component of the eggshell is calcium carbonate, which provides it with hardness and strength. Calcium carbonate content of eggshells contributes to the overall quality of the egg and eggs are an essential component of human and animal nutrition. Eggshells containing high calcium carbonate can also be processed and used as calcium supplement for bone and teeth health in vulnerable populations. Objectives: This study determined the calcium carbona

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Kos, Tatiana, Inha Kuznietsova, Tamila Sheiko, et al. "Improving the method of determining the mass fraction of magnesium carbonate and the study of the chemical composition of carbonate rocks for the effective conduct of the technological process of sugar production." Potravinarstvo Slovak Journal of Food Sciences 15 (September 27, 2021): 901–16. http://dx.doi.org/10.5219/1620.

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The article considers an improved method for determining the content of magnesium carbonate in the carbonate rock. An adjusted method for determining the content of magnesium carbonate was included in the complete establishment of chemical analysis of limestone, which includes the determination of moisture, impurities insoluble in hydrochloric acid, the amount of one and a half oxides of aluminum and iron, calcium carbonate and magnesium carbonate (advanced method), calcium sulfate, alkali metal oxides of potassium and sodium. The obtained experimental data were entered into a single table and

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Gao, Qing He, Yi Can Wang, and Yu Mei Jiang. "Study on Scaling Formation Characteristics and Produced Liquid Properties in Oil-Wells of ASP Flooding." Advanced Materials Research 524-527 (May 2012): 1270–78. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1270.

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Strong base ASP flooding technology can improve oil recovery by 20%, but the lifting system exists serious scaling problems which cause pump detection period shorter. The main composition of the scale are organisms (heavy oil is in majority), carbonates and silicates. The content of each component is closely related to pH value. With high pH value, the main composition of the scale is silicate. With low pH value, the main composition of the scale is carbonate. The results of analysis of the relationship between scale composition, scaling position and depositional sequence showed that the conte

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Luque, Patricia L., María Belén Sanchez-Ilárduya, Alfredo Sarmiento, Hilario Murua, and Haritz Arrizabalaga. "Characterization of carbonate fraction of the Atlantic bluefin tuna fin spine bone matrix for stable isotope analysis." PeerJ 7 (July 18, 2019): e7176. http://dx.doi.org/10.7717/peerj.7176.

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The mineral component of fish otoliths (ear bones), which is aragonitic calcium carbonate (CaCO3), makes this structure the preferred sample choice for measuring biological carbon and oxygen-stable isotopes in order to address fundamental questions in fish ecology and fisheries science. The main drawback is that the removal of otoliths requires sacrificing the specimen, which is particularly impractical for endangered and commercially valuable species such as Atlantic bluefin tuna (Thunnus thynnus) (ABFT). This study explores the suitability of using the first dorsal fin spine bone of ABFT as

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Shengule, Sudhir R., and Peter Karuso. "Three-Component Mannich-like Reaction of 2-Aminoimidazole." Australian Journal of Chemistry 64, no. 12 (2011): 1617. http://dx.doi.org/10.1071/ch11358.

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A three-component reaction of 2-aminoimidazole with various aldehydes and amines is described that generates 4-substituted 2-aminoimidazoles containing a new chiral centre, a new C–C bond and a new C–N bond. The reactions can be conducted in water and require only sodium carbonate as reagent.

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Kühnel, Isabell, Jacob Podschun, Bodo Saake, and Ralph Lehnen. "Synthesis of lignin polyols via oxyalkylation with propylene carbonate." Holzforschung 69, no. 5 (2015): 531–38. http://dx.doi.org/10.1515/hf-2014-0068.

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Abstract An efficient, nontoxic, and solvent-free oxyalkylation of European beech wood organosolv lignin (OL) has been developed. Two approaches were studied: a direct reaction of lignin with propylene carbonate (PC) and a two-step reaction of lignin with maleic anhydride (MA) followed by oxyalkylation with PC. The structural analysis of lignin polyols was performed by 1H NMR, 13C NMR, 31P NMR, and FTIR spectroscopy. It was demonstrated that PC was able to almost completely oxypropylate aliphatic and phenolic OH groups. Moreover, the carboxylic acid groups of maleated OL were fully oxypropylat

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Froese, Corey R., and David M. Cruden. "Landslides in weakly cemented glaciolacustrine sediments, Morkill River valley, British Columbia." Canadian Geotechnical Journal 38, no. 4 (2001): 889–900. http://dx.doi.org/10.1139/t01-001.

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Slopes in weakly cemented glaciolacustrine sediments in the Morkill River valley in the Canadian Rocky Mountains stand at up to 70°. Based on field and laboratory observations it appears that a contributing factor to instability is the softening of the soils by frost action and the leaching of calcite cement. Field density profiles demonstrated increased density and carbonate content with an increase in depth. Laboratory tests of carbonate content indicated a positive correlation between calcium carbonate and density in the glaciolacustrine sediments. The relationship was strongest in sands, i

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Mahjoubi, Rachida, Saïd Kamel, Yves Noack, Annie Michard, Daniel Nahon, and Christian Carruesco. "Sr isotopic tracing in a lagoonal system : example of surficial carbonate sediments in the Nador lagoon (northeastern Morocco)." Bulletin de la Société Géologique de France 176, no. 4 (2005): 373–80. http://dx.doi.org/10.2113/176.4.373.

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Abstract The Nador lagoon is the largest one in Morocco and along the Mediterranean. It is located on the northeastern coast near the Rif chain (North Morocco), and it is surrounded by volcanic and sedimentary rocks of various lithofacies. The watershed has an area of about 2200 km2 and is drained by a dense river network. The lagoon dimension is of 115 km2 (25 x 7.5 km) with a depth not exceeding 8 m. The island barrier is 25 km in length and 350 m in average width. The carbonate fraction is the dominant component of the present-day sedimentation in the Nador lagoon. It represents 13 to 48 %

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Taylor, Holly L., Isaac J. Kell Duivestein, Juraj Farkas, Martin Dietzel, and Anthony Dosseto. "Technical note: Lithium isotopes in dolostone as a palaeo-environmental proxy – an experimental approach." Climate of the Past 15, no. 2 (2019): 635–46. http://dx.doi.org/10.5194/cp-15-635-2019.

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Abstract. Lithium (Li) isotopes in marine carbonates have considerable potential as a proxy to constrain past changes in silicate weathering fluxes and improve our understanding of Earth's climate. To date the majority of Li isotope studies on marine carbonates have focussed on calcium carbonates. The determination of the Li isotope fractionation between dolomite and a dolomitizing fluid would allow us to extend investigations to deep times (i.e. Precambrian) when dolostones were the most abundant marine carbonate archives. Dolostones often contain a significant proportion of detrital silicate

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Vinichenko, Varvara, Anton Riazanov, and Aleksandr Riazanov. "Influence of Organic Matters on the Calcium Carbonate Decarbonization Process." Materials Science Forum 968 (August 2019): 35–43. http://dx.doi.org/10.4028/www.scientific.net/msf.968.35.

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Pure calcium carbonate, chalk, and coal wastes are taken as starting materials. The Gibbs energy of calcium carbonate decarbonization reactions is calculated. By the method of thermodynamic analysis, the effect of carbon and its gasification products on the calcium carbonate decarbonization process is investigated. The intensifying effect of organic matter during heat treatment of calcium carbonate is shown. In addition to carbon, the decarbonization reactions are influenced by gases evolved as a result of the gasification of the organic part of the coal waste. It is theoretically proven that

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Helfenritter, Christoph, and Matthias Kind. "Determination of Crystal Growth Rates in Multi-Component Solutions." Crystals 12, no. 11 (2022): 1568. http://dx.doi.org/10.3390/cryst12111568.

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Many solid forming processes involve crystallization from multi-component solutions. In order to predict final phase assemblages, multi-component phase transfer kinetics must be known. It is not sufficient to have the kinetics of only one crystallizing component in the presence of other entities; the kinetics of concurrent crystallizing components are of interest as well. However, methods for their determination are currently lacking. We propose a new method comprising desupersaturation measurements of a 150 µm film of supersaturated solution in contact with a planar crystalline substrate. We

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