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Tytuł:
A novel application of building demolition waste for removal benzene from aqueous solutions
Autorzy:
Alquzweeni, Saif S.,
Hassan, Afrah A.
Alkizwini, Rasha S.
Powiązania:
https://bibliotekanauki.pl/articles/35515684.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
building demolition waste
benzene
equilibrium
FTIR analysis
Opis:
A novel application of building demolition waste for removal benzene from aqueous solutions. In this research, demolition waste from buildings has been studied for possible use as benzene removal adsorbent from aquatic solution. The effect of adsorbent dosage, contact time, initial benzene concentration, and initial pH on benzene adsorption capacity have been investigated in the batch adsorption experiments. The adsorption effects initially happened very rapidly and achieved equilibrium within 180 min. Benzene removal was observed to decrease by an increase in the initial concentration of benzene of 300–700 mg·L–1, an increase in the adsorbent dose of 0.4–2.4 g per 100 mL, where an optimum adsorbent dose equal to 1.2 g per 100 mL was found. The potential of adsorption increases with pH 3.0–7.0 to reach the maximum removal efficiency at pH 6.0. The findings showed that equilibrium data were adequately adapted and correlated with the Freundlich isotherm models. The average percentage of the removal at room temperature was about 98%. Results suggest that building demolition waste can be used effectively in industrial wastewater treatment for the removal of aromatic hydrocarbon, benzene, as a low-cost option.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 1; 86-97
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition of Dacyrodes edulis seed oil
Autorzy:
Okafor, N. A.
Ezim, O. E.
Anadebe, V. C.
Ume, C. S.
Powiązania:
https://bibliotekanauki.pl/articles/1113674.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dacyrodis edulis seed
FTIR Analysis
GC-Analysis
Phytochemical Analysis
Opis:
Dacyrodes edulis seed were collected peeled, dried and powdered. The oil were extracted by simple method of cold extraction, the extracts were characterized by the Phytochemical analysis, Fourier transform infrared spectroscopy (FTIR) and Gas Chromatography (GC) to identify the fatty acid profile present in the seed oil. The FTIR analysis shows the variation of the peaks which indicate there is synergy among the functional groups of the extract. The phytochemical analysis revealed the presence of alkaloids, flavonoids, phenol, saponins, tannins and steroids, the study reveal the chemical constituents of Dacyrodes edulis seed oil that these constituents may be behind their medicinal values in phytomedicine.
Źródło:
World News of Natural Sciences; 2017, 14; 72-78
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic analysis of phytochemical compounds in Garcina kola leaf extract
Autorzy:
Anadebe, V. C.
Okafor, N. A.
Okafor, B. O.
Emmanuel, C. C.
Powiązania:
https://bibliotekanauki.pl/articles/1113583.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
FTIR Analysis
GC-MS
Garcina kola leaf
Phytochemical Analysis
Opis:
Garcina kola leaves were collected, washed, dried and powdered. The ethanol extracts were first prepared by the simple method of cold extraction. The extracts were then characterized by the Phytochemical analysis, Fourier transform infrared spectroscopy (FTIR) and Gas chromatography mass spectroscopy (GC-MS) to identify the fatty acids and heterocyclic compounds present in the leaf extracts. The FTIR analysis shows a variation of the peaks that indicate there is synergy among the functional groups of the extract. Moreover, the phytochemical analysis revealed the presence of alkaloids, flavonoids, phenol, saponins, tannins and steroids. The study reveals that the chemical constituents of Garcina kola leaf may be behind their medicinal values in phytomedicine.
Źródło:
World News of Natural Sciences; 2017, 15; 162-168
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miscibility and interactions in chitosan and polyacrylamide mixtures
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035186.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM
FTIR analysis
chitosan
polyacrylamide
polymer blends
surface properties
Opis:
In the present work, the results of Fourier transform infrared (FTIR) and atomic force microscopy (AFM) studies of films of chitosan acetate (ChA), polyacrylamide (PAM), and their mixtures are presented. The morphology of the ChA and PAM films and their mixtures was studied by tappingmode atomic force microscopy (AFM). The topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of mixtures by AFM showed a completely different morphology when compared with pure components. The roughness of mixtures increases with the increase of ChA content but is significantly reduced after UV exposure. This may indicate a strong interaction between the polymeric components. The FTIR spectroscopy also supports the obtained results. The miscibility of polymer mixtures is related to interactions between the functional groups of the polymeric components.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 65-71
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption behaviour of As(III) onto synthetic iron-based minerals: a comparative study of akaganeite, goethite and magnetite
Autorzy:
Ulatowska, Justyna.
Powiązania:
https://bibliotekanauki.pl/articles/2146953.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
iron-based minerals
arsenic
adsorption
FTIR analysis
kinetic study
Opis:
The present study compares the adsorption capacity of iron-based minerals in removing As(III) from aqueous solutions. The work contains the results of studies carried out on a laboratory scale. The synthetic material was used in three forms as akaganeite, goethite and magnetite. To characterise the minerals before and after adsorption of As(III), specific surface area, particle size distribution, density, and zeta potential were determined. Additionally, digital and optical micrographs, SEM, and FTIR analyses were performed. In the experimental part, the influence of the main parameters on the adsorption efficiency was investigated (pH, initial concentration, contact time, and amount of adsorbent). Adsorption isotherms were fitted by Freundlich, Langmuir, and DubininRadushkevich models. Pseudo-first-order (PFO), pseudo-second-order (PSO), and intraparticle diffusion (IPD) models were used to fit the kinetics data. Linear regression was used to estimate the parameters of isotherm and kinetic models. FTIR measurements gave helpful information on the synthesised minerals and the As(III) removal process. Results show that As(III) adsorption is related to the iron-based adsorbents, and adsorption efficiency increases in the following order: goethite < magnetite < akaganeite.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 144818
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania gleb, wyrobów kamieniarskich i skał – wybrane przypadki opinii wykonywanych w Centralnym Laboratorium Kryminalistycznym Policji w Warszawie
Research on soils, stone products and rocks – selected cases of opinions issued by the Central Forensic Laboratory of the Police in Warsaw
Autorzy:
Bachliński, Robert
Powiązania:
https://bibliotekanauki.pl/articles/23050941.pdf
Data publikacji:
2021
Wydawca:
Centralne Laboratorium Kryminalistyczne Policji
Tematy:
geologia sądowa
beton
gleba
bursztyn
badania mikroskopowe
dyfrakcja rentgenowska
badania SEM
badania FTIR
forensic geology
concrete
soil
amber
microscopic studies
X-ray diffraction
SEM analysis
FTIR analysis
Opis:
Badania gleb, wyrobów kamieniarskich i skał są związane z dyscypliną naukową zwaną geologią sądową. Spośród policyjnych laboratoriów kryminalistycznych badania tego rodzaju wykonywane są jedynie w Zakładzie Chemii Centralnego Laboratorium Kryminalistycznego Policji (CLKP) w Warszawie w liczbie ok. 2% wszystkich ekspertyz rocznie. Pomimo dość niewielkiego napływu tego typu opinii w ostatnich latach z roku na rok rośnie zainteresowanie organów ścigania wykorzystaniem wspomnianych badań w procesie karnym. Poniższy tekst przedstawia przykładowe trzy opinie wykonane w ostatnich latach w CLKP. Pierwsza dotyczy zabójstwa, a do dokonania czynu zabronionego wykorzystano płyty betonowe. Kolejna jest związana z pożarem maszyn rolniczych, materiałem dowodowym są zaś gleby z miejsca zdarzenia i z ubrania podejrzanego. Ostatnia dotyczy fałszowania półproduktów do wytwarzania wyrobów jubilerskich z bursztynu.
Research on soils, stone products and rocks is part of a scientific discipline known as forensic geology. Among the police forensic laboratories, this type of studies are performed only at the Chemistry Department of the Central Forensic Laboratory of the Police (CFLP) in Warsaw and comprise approximately 2% of all opinions issued annually. Despite a relatively low workload in recent years, the interest of law enforcement agencies in the use of this type of analyses in the criminal proceedings is on the rise. This article presents three exemplary opinions issued in recent years at the CFLP. The first opinion relates to murder, whereby concrete slabs were used to commit the criminal act. The second is related to an agricultural machinery fire, whereby evidence included soil samples recovered at the scene and from the suspect’s clothing. The last opinion concerns the falsification of semi-finished products used for amber jewelry craftsmanship.
Źródło:
Problemy Kryminalistyki; 2021, 311; 21-34(pol), 57-70(eng)
0552-2153
Pojawia się w:
Problemy Kryminalistyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on co-pyrolysis of sewage sludge with coal
Autorzy:
Tan, Z.-X.
Ai, P.
Li, Y.-M.
Ji, X.-Y.
Feng, W.
Powiązania:
https://bibliotekanauki.pl/articles/207582.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal
carbon dioxide
sewage sludge
co-pyrolysis
FTIR analysis
coal sludge
thermal reactions
węgiel
dwutlenek węgla
osady ściekowe
FTIR
szlam węglowy
reakcje termiczne
kopiroliza
piroliza osadów ściekowych
Opis:
Co-pyrolysis characteristics of sludge with coal and sludge briquetted with coal were studied by the TG-FTIR method. From TG data, weight loss of sludge briquetted was higher than that of sludge and sludge and coal which means that thermal reaction effect of sludge briquetted is better than those of other two materials. Gas products of pyrolysis were CO, CO2, H2O, alcohol, ketone, acid, hydrocarbon, amine and azine from the FTIR analysis. At last, evolving patterns of the pyrolyses and the yields of their gas products have been recorded, providing extremely important data on the mechanism of the process.
Źródło:
Environment Protection Engineering; 2014, 40, 1; 117-126
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation of the Extended Storage of Single-base Propellants
Autorzy:
Nedkova, M.
Shishkov, P.
Varadinova, L.
Glavchev, I.
Powiązania:
https://bibliotekanauki.pl/articles/358213.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
ageing
single-base propellants
elemental analysis
FTIR
swelling
Opis:
An investigation of single-base propellants has been conducted. The ageing process during extended storage of single-base propellants (SBP) in nonheated military stores and a heated building has been investigated by elemental analysis. Two or three different absorbencies around the band at 1650 cm-1 were observed by FTIR spectroscopy. In this way, not only the denitration of the propellants was determined, but also cleavage of -O-C- bonds between the glycoside rings in the nitrocellulose macromolecules. The latter process was confirmed by the swelling of the SBP.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 4; 613-624
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
USE OF GLUTARIC ACID TO IMPROVE THE SOLUBILITY AND DISSOLUTION PROFILE OF GLIPIZIDE THROUGH PHARMACEUTICAL COCRYSTALLIZATION
Autorzy:
Batool, Fakhra
Ahmad, Mahmood
Minhas, Muhammad U.
Khalid, Qandeel
Idrees, Hafiz A.
Khan, Fahad M.
Powiązania:
https://bibliotekanauki.pl/articles/895470.pdf
Data publikacji:
2019-02-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
FTIR
SEM
PXRD
thermal analysis
glipizide
glutaric acid
Opis:
The purpose of current study was to improve the solubility and dissolution profile of BCS class-II drug Glipizide using glutaric acid as a coformer via various cocrystalization techniques i.e., dry grinding, liquid assisted grinding, slurry and solvent evaporation. Fourier Transform Infrared Spectroscopy (FTIR) was performed to determine the interaction between components of glipizide-glutaric acid (GPZ-GLU) cocrystals. Powder X-ray Diffraction (PXRD) studies confirmed the crystalline nature of formulated cocrystals. Scanning Electron Microscopy (SEM) revealed cylindrical to rectangular shape of cocrystals. Flow properties of GPZ-GLU cocrystals were evaluated by micromeritics analysis. Size and surface morphology was determined by zeta sizer analysis and optical microscopy. Differential scanning calorimetry (DSC) and Thermogravimetric (TGA) analysis were performed to determine the melting points as well as thermal stability of pure components and formulated GPZ-GLU cocrystals. In-vitro drug release studies were carried out using dissolution apparatus-II. GPZ-GLU cocrystals showed higher drug release at pH 6.8 as compared to pH 1.2. However, percent drug release of optimum formulations at pH 6.8 was determined as; 24%-92.2% (F3) and 12.0%-93.5% (F7). Solubility studies revealed improved solubility as compared to pure drug in water i.e., 53 folds and 54.27 folds from F3 and F7 cocrystals, respectively. Finally it was concluded that glutaric acid has improved the solubility and dissolution profile of glipizide. However, many cocrystal formers have been reported in literature that can be used to enhance the physicochemical properties as well as bioavailability of poorly soluble drugs via cocrystalization technique.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 103-114
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic field of extremely low frequency has an impact on selected chemical components of the honeybee
Autorzy:
Koziorowska, A.
Depciuch, J.
Białek, J.
Woś, I.
Kozioł, K.
Sadło, S.
Piechowicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/2087262.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Apis mellifera
ELF-EMF
FTIR
spectra analysis
body chemical composition
Źródło:
Polish Journal of Veterinary Sciences; 2020, 23, 4; 537-544
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of SR - FTIR microspectroscopy for a preliminary biochemical study of the rat hippocampal formation tissue in case of pilocarpine induced epilepsy and neutroprotection with FK- 506
Autorzy:
Dudała, J.
Janeczko, K.
Setkowicz, Z.
Eichert, D.
Chwiej, J.
Powiązania:
https://bibliotekanauki.pl/articles/146884.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
pilocarpine-induced epilepsy
FK-506 (tacrolimus)
SR-FTIR microspectroscopy
biochemical analysis
Opis:
The main aim of the work was the biochemical analysis of the hippocampal formation tissue in the case of epileptic rats treated with the neuroprotective agent FK-506. Three groups of animals were compared: rats with pilocarpine induced seizures treated and non-treated with tacrolimus as well as naive controls. Synchrotron radiation Fourier transform infrared (SR-FTIR) microspectroscopy was used for the biomolecular analysis of studied samples. The measurements were carried out at SISSI beamline of ELETTRA. A Bruker IFS 66v/S interferometer coupled to a Bruker Hyperion 2000 microscope was used. The tissue samples were analyzed in transmission mode with a beam defined by a small aperture and spatial resolution steps of 10 mi m which allowed us to probe the selected cross-line of the sample at cellular resolution. The obtained results enabled to compare the distributions of proteins and lipids in the three hippocampal cellular layers, i.e. in molecular, multiform and granular layers. For epileptic animals both treated and non-treated with FK-506, the tendency for increase of the ratio of the absorbance at around 1548 and 1658 cm-1 (amide II/amide I ratio) was observed, however only for the multiform layer these changes were statistically significant. Similar relation was noticed in case of the ratio of the absorbance at around 1631 and 1658 cm-1. The mentioned results may suggest conformational changes of proteins in the direction of beta-sheet secondary structure. Additionally, a statistically significant increase in the lipid massif and a decrease of the ratio of absorbance at around 2921 and 2958 cm-1 were observed for epileptic animals treated with tacrolimus comparing to the control group.
Źródło:
Nukleonika; 2012, 57, 4; 615-619
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Anticoagulant Dabigatran by Analytical Instrumentation
Autorzy:
Patel, B.
Ram, P.
Khatri, T.
Ram, V
Dave, P.
Powiązania:
https://bibliotekanauki.pl/articles/412564.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dabigatran
UPLC/MS/MS
zeta potential
FTIR
UV-NIR
Thermal analysis
Opis:
Dabigatran with IUPAC name 3-({2-[(4-Carbamimidoyl-phenylamino)-methyl]-1-methyl-1H-benzoimidazole-5-carbonyl}-pyridin-2-yl-amino)-propionic acid, which can be used to prevent strokes in those with atrial fibrillation due to causes other than heart valve disease, and at least one additional risk factor for stroke (congestive heart failure, hypertension, age, diabetes, and prior stroke), with molecular formula C34H41N7H5 was studied in detail for functional group analysis with FTIR, characteristic absorbance by UV-NIR, thermal behavior by TGA-DTA-DSC, particle size and stability of the molecule with Nano particle size analyzer. The structure was confirmed by LC-MS/MS with ESI probe and mass was found in aggregation with the reported standard values. The purity of drug was determined by Prep. HPLC analysis. FTIR analysis showed the characteristic peak of carboxylic acid, UV-NIR analysis showed that the λmax was 224 nm with methanol as a diluent, the compound was found stable in the thermal analysis, the average particle size was found to be 25.2 nm, Z-average as 0.2 nm and zeta potential as -67.6 mv hence showed excellent stability in the zeta potential analysis as per ASTM standards D4187-82, American Society of Testing and Materials, 1985.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 233-242
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared spectroscopy methods in reservoir rocks analysis – semiquantitative approach for carbonate rocks
Metody spektroskopii w podczerwieni w analizach skał zbiornikowych – podejście półilościowe w badaniach skał węglanowych
Autorzy:
Mroczkowska-Szerszeń, M.
Orzechowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1835138.pdf
Data publikacji:
2018
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
quantitative rock analysis
PCR
PLS
reservoir rocks analysis
FTIR-ATR spectroscopy
XRD
carbonate rocks
metody ilościowe badania składu skał
analizy skał zbiornikowych
spektroskopia FTIR-ATR
skały węglanowe
Opis:
Experimental results and methodology for mineral composition determination of reservoir rocks by means of Fourier Transformed Infrared Spectroscopy technique (FTIR) was a subject to present in the paper. The FTIR data were calibrated with use of X-ray diffraction and X-ray fluorescence (XRF) methods. This approach allows quantitative and semiquantitative analysis basing on use of statistical methods like PCR (Principal Component Regression) or PLS (Partial Least Squares) to calibrate FTIR ATR in purpose to create efficient and cost saving tool for quick screening analysis of reservoir rocks samples. The presented approach allows for calibration of FTIR ATR using statistical methods like PCR (Principal Component Regression) or PLS (Partial Least Squares) in order to create efficient and cost saving tool for quantitative and semi-quantitative analysis of reservoir rocks samples. In the paper, 18 surface carbonate rocks samples of limestone and dolomite type belonging to the Paleozoic and Mesozoic age from the Kraków–Częstochowa Upland and Main Dolomite from Fore-Sudetic Monocline were analyzed. FTIR results were qualitatively described by analysis together with tentative assignments of their molecular bonds vibrations assignments are presented and a spectra interpretation for typical carbonates associated minerals. The technical constrains of the methodology resulting from proper method calibration and metal oxide analysis limitations were also discussed. Furthermore the behavior of the PCR and PLS algorithms in case of monomineral samples was commented and the necessity of additional qualitative spectra verification was indicated in this case for the final assessment of quantitative data quality. The quantitative results of FTIR analysis were compared with X-ray diffraction (XRD) quantitative data, part of them has been used as validation data. The accordance of the data series was better than 6% for each analyzed mineral phases excluding the outliers indicated by the analytical algorithm. The method was also successfully applied to the quantitative analysis of shale rocks, however, this part of the research will be presented in a separate paper.
Praca przedstawia wyniki eksperymentalne oraz metodologię badania składu mineralnego skał zbiornikowych z zastosowaniem fourierowskiej spektroskopii w podczerwieni (FTIR – Fourier-transformed infrared spectroscopy). Wyniki spektroskopii FTIR kalibrowano z użyciem metod dyfrakcji rentgenowskiej (XRD – X-ray diffraction) oraz fluorescencji rentgenowskiej (XRF – X-ray fluorescence). Takie podejście pozwala na analizę półilościową, a nawet ilościową z zastosowaniem metody FTIR ATR. Metodyka opiera się na użyciu metod statystycznych, takich jak PCR (principal component regression) oraz PLS (partial least squares), do kalibracji metody FTIR ATR za pomocą innych danych w celu stworzenia wydajnego, szybkiego i finalnie niedrogiego narzędzia do zgrubnych (przesiewowych) badań skał zbiornikowych. W opracowaniu przedstawiono przykładowe wyniki analiz skał węglanowych (wapieni i dolomitów) dla 18 próbek skalnych z różnych lokalizacji, w tym próbek powierzchniowych ery paleozoicznej i mezozoicznej z rejonu Jury Krakowsko-Częstochowskiej, z okolic Krakowa, a także próbki reprezentujące dolomit główny z rejonu monokliny przedsudeckiej. Wyniki FTIR opatrzono opisem jakościowym zawierającym szczegółowe przypisania najważniejszych pasm drgań, jak również opisem widm minerałów towarzyszących. Przedstawiono też ograniczenia metody związane z kalibracją, a także z analizami próbek zawierających takie minerały jak piryt i tlenki metali czy też z zachowaniem wybranych algorytmów analizy ilościowej próbek w przybliżeniu monomineralnych. W tym przypadku zaznaczono konieczność przeprowadzenia jakościowej weryfikacji widm dla otrzymanych danych ilościowych, aby zachować ich odpowiednią jakość. Porównano wyniki badań ilościowych FTIR z wynikami ilościowych analiz z użyciem metody dyfrakcji rentgenowskiej (XRD), część wyników traktując jako walidację metody. Otrzymano zgodność na poziomie nie gorszym niż 6% odchyłki dla poszczególnych faz, nie wliczając wyników odstających, które najczęściej odrzuca metoda jako niespełniające kryteriów. Wyniki dodatkowo weryfikowano, stosując technikę fluorescencji rentgenowskiej XRF. Metodyką tą z powodzeniem posłużono się także w przypadku skał łupkowych, jednak ta część wyników zaprezentowana zostanie w oddzielnym opracowaniu.
Źródło:
Nafta-Gaz; 2018, 74, 11; 802-812
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation and characterization of furfuryl mercaptan-β-cyclodextrin inclusion complex and its thermal release characteristics
Autorzy:
Zhu, Guangyong
Xiao, Zuobing
Yu, Gengfa
Zhu, Guangxu
Niu, Yunwei
Liu, Junhua
Powiązania:
https://bibliotekanauki.pl/articles/2081512.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Furfuryl mercaptan-β-cyclodextrin
Inclusion complex
XRD
FTIR
Thermal analysis
Molecular mechanics
Opis:
Furfuryl mercaptan has the aroma characteristics of coffee. However, it is unstable during storage of coffee brew and roasted coffee. In order to enhance the stability of furfuryl mercaptan, furfuryl mercaptan-β-cyclodextrin inclusion complex was synthesized using the precipitation method in this work. Fourier transform infrared spectroscopy, x-ray diffraction, and thermogravimetric analysis (TG) were used to characterize the resulting products. The interaction of furfuryl mercaptan with β-cyclodextrin was inve-stigated by the molecular mechanics (MM) method. These changes in FTIR and XRD gave supporting evidence for the successful formation of furfuryl mercaptan-β-cyclodextrin inclusion complex. The TG results showed that the formation of furfuryl mercaptan-β-cyclodextrin inclusion complex could improve the thermal stability of furfuryl mercaptan and provide a long-lasting effect. The structure of furfuryl mercaptan-β-cyclodextrin inclusion complex with the minimum energy was obtained by MM2 calculation, and the minimum binding energy was –77.0 kJ mol–1 at –1.96 × 10–10 m.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 4; 35-40
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza gazów z grupy BTEX metodą spektroskopii fourierowskiej w podczerwieni (FTIR)
Analysis of Gases from BTEX Group by Fourier Transform Infrared Spectroscopy (FTIR)
Autorzy:
Bobrowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/382725.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gaz wzorcowy
BTEX
FTIR
analiza gazów
spektroskopia
calibration gas
gas analysis
spectroscopy
Opis:
W artykule przedstawiono wyniki analizy gazu wzorcowego zawierającego związki z grupy BTEX. Do tego celu wykorzystano spektrometr FTIR wraz z kuwetą gazową o pojemności 2,3 l i długości drogi optycznej 16 m oraz oprogramowaniem służącym do rejestracji widm w podczerwieni i analizy ilościowej. Celem badań było porównanie wyników analizy ilościowej uzyskanej przy pomocy aparatury posiadanej na Wydziale Odlewnictwa AGH z wynikami deklarowanymi przez dostawcę gazu. Stwierdzono, że zastosowana metoda badawcza pozwala na analizę gazów z wysoką dokładnością. Wykazano także, że w przypadku analizy związków z grupy BTEX dochodzi do zafałszowania wyników związanego z pochłanianiem ditlenku węgla z atmosfery przez wiązkę promieniowania podczerwonego. Wynika to z nałożenia się pasm analitycznych CO2 i BTEX.
The article presents analysis results of the calibration gas containing BTEX compounds from the group. For this purpose the FTIR spectrometer was used with the gas cell with capacity of 2.3 l and optical path length of 16 m and software for the registration and infrared spectra and quantitative analysis. The aim of the study was to compare the results of quantitative analysis obtained using the apparatus possessed on the AGH - Faculty of Foundry Engineering results declared by the gas supplier. It was found that the applied test method allows analysis of gases with an accuracy of 1 ppm. It was also shown that in the case of the analysis of the compounds from the BTEX group comes to an error of the results associated with the absorption carbon dioxide from the atmosphere by a beam of infrared radiation. This is due to the overlapping bands of CO2 and BTEX analysis.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4 spec.; 17-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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