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Wyświetlanie 1-15 z 45
Tytuł:
A green method for the removal of Zinc(II) ions from wastewater using modifed biopolymers
Autorzy:
Jeyaseelan, Christine
Jain, Antil
Jugade, Ravin
Powiązania:
https://bibliotekanauki.pl/articles/2131501.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
Adsorption
modified chitosan
spectrophotometry
zinc(II)
Opis:
Zinc pollution in wastewater is a global problem because it is highly toxic. Zinc is commonly used in industries that transfer the water containing zinc directly into water sources, leading to pollution. Exposure to a high level of zinc causes major health problems. This study evaluated the adsorption of zinc ions from aqueous system using modified biopolymers of chitosan by crosslinking with sulphates using the batch adsorption method; the concentration was determined using atomic absorption spectrophotometry. The sulphate cross-linked chitosan (SCC) was characterised by several method. The effects of various experimental parameters such as pH, contact time, concentration, adsorbent dosage and temperature were investigated. Under the optimised conditions, the percentage efficiency for the removal of zinc(II) was up to 85%. Freundlich and Langmuir isotherms were used to analyse the equilibrium adsorption data along with kinetic studies. Various thermodynamic parameters have also been reported.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2021, 26; 101-111
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2-(4-Diethylaminostyryl)-1,3,3-trimethyl-5-thiocyanato-3H-indolium chloride as a new reagent for indirect spectrophotometric red-ox determination of Osmium (VI)
Autorzy:
Kormosh, Z.
Korolchuk, S.
Powiązania:
https://bibliotekanauki.pl/articles/779698.pdf
Data publikacji:
2008
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
osm
oznaczanie
spektrofotometria
osmium
determination
spectrophotometry
Opis:
A highly sensitive indirect spectrophotometric redox method for the determination of osmium is reported on. The method is based on the oxidation of iodide by osmium (VI) and the spectrophotometric detection of the liberated iodine in the form of complex anion associate with 2-(4-diethylaminostyryl)-1,3,3-trimethyl-5-thiocyanato-3H-indolium chloride reagent. The appropriate reaction conditions have been established. The molar absorptivity is (0.2-1.2)ź10^5 dm3/molźcm at 589.5 nm wavelength. The absorbance of the coloured extracts obeys the Beer's law in the range to 7.6 mg/dm3 of Os(VI).
Źródło:
Polish Journal of Chemical Technology; 2008, 10, 2; 17-19
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanism of peroxynitrite interaction with cytochrome c.
Autorzy:
Gębicka, Lidia
Didik, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1043459.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cytochrome c
radiolysis
peroxynitrite
stopped-flow spectrophotometry
Opis:
Kinetics of the reaction of peroxynitrite with ferric cytochrome c in the absence and presence of bicarbonate was studied. It was found that the heme iron in ferric cytochrome c does not react directly with peroxynitrite. The rates of the absorbance changes in the Soret region of cytochrome c spectrum caused by peroxynitrite or peroxynitrite/bicarbonate were the same as the rate of spontaneous isomerization of peroxynitrite or as the rate of the reaction of peroxynitrite with bicarbonate, respectively. This means that intermediate products of peroxynitrite decomposition, ·OH/·NO2 or, in the presence of bicarbonate, CO3-·/·NO2, are the species responsible for the absorbance changes in the Soret band of cytochrome c. Modifications of the heme center of cytochrome c by radiolytically produced radicals, ·OH, ·NO2 or CO3-·, were also studied. The absorbance changes in the Soret band caused by radiolytically produced ·OH or CO3-· were much more significant that those observed after peroxynitrite treatment, compared under similar concentrations of radicals. ·NO2 produced radiolytically did not interact with the heme center of cytochrome c. Cytochrome c exhibited an increased peroxidase-like activity after reaction with peroxynitrite as well as with radiolytically produced ·OH, ·NO2 or CO3-· radicals. This means that modification of protein structure: oxidation of amino acids and/or tyrosine nitration, facilitates reaction of H2O2 with the heme iron of cytochrome c, followed by reaction with the second substrate.
Źródło:
Acta Biochimica Polonica; 2003, 50, 3; 815-823
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on spectra-photometric monitoring of urea in dialysate
Autorzy:
Filutowicz, Z.
Łukaszewski, K.
Pieszyński, K.
Powiązania:
https://bibliotekanauki.pl/articles/333345.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
monitorowanie dializ
mocznik
spektrofotometria
dialysis monitoring
urea
spectrophotometry
Opis:
The authors try to explain why the direct, spectra-photometric examination of urea content in dialysate is practically ineffective (in UV-VIS range of spectrum) despite the fact that, in general, spectra-photometry is valuable and very sensitive method of chemical composition determination. An attempt was made to prove that spectra-photometric monitoring of urea dialysis, in chosen parts of UV-VIS spectrum, can be achieved only through indirect measurements.
Źródło:
Journal of Medical Informatics & Technologies; 2004, 8; MM105-110
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectrophotometric Analysis of the Kinetic of Pd(II) Chloride Complex Ions Sorption Process from Diluted Aqua Solutions Using Commercially Available Activated Carbon
Autorzy:
Wojnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/354034.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
palladium
recovery
recycling
adsorption
sorption
chloride ions
spectrophotometry
Opis:
In this paper, results of adsorption kinetic studies of Pd(II) chloride complex ions on activated carbon Organosrob 10 CO are presented. Spectorphotometrical method was applied to investigate the process. Kinetic model was proposed, and fundamental thermodynamic parameters were determined. Proposed kinetic model describes well observed phenomenon in the studied range of concentration of Pd(II) chloride complex ions as well, as concentration of activated carbon.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2405-2411
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of molding conditions on the quality of geopolymer surfaces
Autorzy:
Jaglarz, Janusz
Wyszyński, Dominik
Lach, Michał
Mikuła, Janusz
Duraj, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/173702.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
surface topography
bidirectional reflectance distribution function
ellipsometry
spectrophotometry
Opis:
The presented work describes the method of measuring surface topography with application of BRDF (bidirectional reflectance distribution function), ellipsometry and spectrophotometry. This non-contact method enables measurement and analysis of large area surfaces, such as plasters and facades. A standard method of topography analysis does not describe sufficiently all of the interesting features. The visual aspect of the surface evaluation is very important from the functional and utilitarian point of view. The proposed methods of surface analysis enable not only the quantitative evaluation but also indirectly the qualitative properties (visual aspects).
Źródło:
Optica Applicata; 2020, 50, 1; 135-146
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitive and selective extraction-free spectrophotometric determination of quetiapine fumarate in pharmaceuticals using two sulphonthalein dyes
Autorzy:
Rajendraprasad, N.
Basavaiah, K.
Vinay, K.B.
Powiązania:
https://bibliotekanauki.pl/articles/3032.pdf
Data publikacji:
2010
Wydawca:
Instytut Medycyny Wsi
Tematy:
extraction
spectrophotometry
determination
quetiapine fumarate
drug
sulphonthalein dye
Źródło:
Journal of Pre-Clinical and Clinical Research; 2010, 04, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of magnetic nanoparticles for water treatment
Autorzy:
Marcinkowska, D.
Powiązania:
https://bibliotekanauki.pl/articles/134736.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
magnetic nanoparticles
water treatment
cyclodextrins
maghemite
absorption spectrophotometry
Opis:
In this study magnetic nanoparticles were fabricated and used for water treatment. Nanoparticles were prepared in two ways. The first one involved NiZn ferrite nanoparticles synthesized by co-precipitation of metal cations with sodium hydroxide at high temperature. The second one featured maghemite nanoparticles was prepared by salt-assisted solid-state reaction. Modification and functionalization of nanoparticles surface was investigated. Nanoparticles were characterized by scanning electron microscopy (SEM). Modified nanoparticles were added to the solution of desired concentration of methylene green. Adsorption ability was examined trough ultraviolet-visible spectroscopy (UV-VIS). For NiZn ferrite and also for maghemite nanoparticles results were positive. Both of complexes can be used for water treatment with 51% success for maghemite and 72% for NiZn ferrite nanoparticles.
Źródło:
Technical Issues; 2016, 2; 33-38
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The attempts to identify the sources of the emission of phenol compounds in the Upper Dunajec catchment
Próby ustalenia źródeł emisji związków fenolowych w zlewni górnego Dunajca
Autorzy:
Michałowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/385847.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Dunajec
fenole
zanieczyszczenie wody
spektrofotometria
phenols
water pollution
spectrophotometry
Opis:
Dunajec – a river in south Poland, together with the San River, is the most important right-bank tributary of the Vistula River. It flows into the Vistula River at its 160.6 km. The Upper Dunajec area starts at the spring and ends at the mouth of the Ochotnica stream (including the stream itself). The catchment of the upper Dunajec is placed in two districts: Tatrzański and Nowotarski. It is very important to keep the catchment as clean as possible due to the fact that it supplies both districts with drinkable water. The goal of my paper was to find out to what extent the upper Dunajec catchment was contaminated with phenols. All contaminants in water mostly come from chemical substances, bacteria and other microorganisms that are present in natural waters in huge amounts. These contaminants are permanent and resistant towards chemical or biochemical processes that are supposed to purify the water. Phenol and its derivatives are very toxic, ones of the most burdensome compounds for the environment. Sources of phenol compounds emission can be divided into two groups: of natural and of anthropogenic origin, i.e. resulting from human activity in industry, agriculture as well as in tourism. The most dangerous substances that cause contamination of water with phenols are wastewaters coming from plastics, paint pigments, varnish or glue factories and from pharmaceutical companies. Municipal wastewaters tend to contaminate water with phenols as well, however to smaller extent. Phenol and its derivatives are widely used in many branches of industry as well as in agriculture. In order to mark phenol concentrations, I applied the photometric method.
Dunajec, rzeka w południowej Polsce, jest obok Sanu najważniejszym prawobrzeżnym dopływem Wisły. Górny Dunajec rozciąga się od źródeł do ujścia potoku Ochotnica. Zlewnia górnego Dunajca znajduje się na terenie dwóch powiatów: tatrzańskiego oraz nowotarskiego. Bardzo ważne jest utrzymanie w jak największej czystości tej zlewni, gdyż dostarcza ona wody pitnej dla obu powiatów. Celem pracy było oznaczenie stopnia zanieczyszczenia związkami fenolowymi zlewni górnego Dunajca. Nieczystości te są trwałe i odporne na działanie procesów chemicznych czy też biochemicznych służących oczyszczeniu wód. Fenol i jego pochodne są związkami o dużej toksyczności, należą do substancji najbardziej uciążliwych dla otoczenia. Źródła emisji związków fenolowych dzielimy na dwie grupy: pochodzenia naturalnego oraz pochodzenia antropogenicznego, czyli będące wynikiem działalności człowieka w przemyśle, rolnictwie czy też turystyce. Najważniejszymi emitorami związków fenolowych do wód są ścieki z fabryk tworzyw sztucznych, barwników, farb, lakierów czy klejów oraz z zakładów farmaceutycznych. W mniejszym stopniu wprowadzane są do wód ze ściekami komunalnymi. Fenol oraz jego pochodne mają szerokie zastosowanie w bardzo wielu gałęziach przemysłu, a także w rolnictwie. Do oznaczenia stężeń fenoli wykorzystano metodę fotometryczną.
Źródło:
Geomatics and Environmental Engineering; 2011, 5, 1; 85-102
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New spectrophotometric methods for the determination of nifedipine in pharmaceutical formulations
Autorzy:
Rahman, Nafisur
Azmi, Syed
Powiązania:
https://bibliotekanauki.pl/articles/1041343.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
pharmaceutical formulations
spectrophotometry
potassium hydroxide
validation
nifedipine
ammonium molybdate
Opis:
Two simple, sensitive and economical spectrophotometric methods were developed for the determination of nifedipine in pharmaceutical formulations. Method A is based on the reaction of the nitro group of the drug with potassium hydroxide in dimethyl sulphoxide (DMSO) medium to form a coloured product, which absorbs maximally at 430 nm. Method B uses oxidation of the drug with ammonium molybdate and subsequently reduced molybdenum blue is measured at 830 nm. Beer's law is obeyed in the concentration range of 5.0-50.0 and 2.5-45.0 µg ml-1 with methods A and B, respectively. Both methods have been successfully applied for the assay of the drug in pharmaceutical formulations. No interference was observed from common pharmaceutical adjuvants. The reliability and the performance of the proposed methods are established by point and interval hypothesis tests and through recovery studies.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 915-922
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DETERMINATION OF FLUOXETINE HYDROCHLORIDE VIA ION PAIR COMPLEXATION WITH ALIZARIN RED S
Autorzy:
Clementina, Constantinescu I.
Alexandra, Neagu F.
Valentina, Uivarosi
Powiązania:
https://bibliotekanauki.pl/articles/895425.pdf
Data publikacji:
2018-12-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
spectrophotometry
Alizarin Red S
fluoxetine hydrochloride
ion pair
fluorimetry
Opis:
Two UV-Vis spectrophotometric methods and one fluorimetric method have been developed for the quantitative determination of fluoxetine hydrochloride in bulk and pharmaceutical formulations. These methods are based on the ion pair complex formation between alizarin red S and fluoxetine hydrochloride. In the first method (method A), the yellow-coloured complex obtained in acidic medium was extracted with chloroform, and the absorbance of chloroformic solution was measured at 425 nm. Beer’s law limits (9.5 – 48 µg/mL), the molar absorptivity (5256 L · mol-1· cm-1), and the complex composition (1:1) were determined. In the second method (method B), the yellow complex fluoxetine – alizarin red S extracted in chloroform was broken in alkaline medium, and the absorbance of the resulting violet-coloured free dye was measured at 524 nm. A linear relationship was observed in the range 9.0 – 54 µg/mL. In the third method (method C) the fluorescence intensity of the fluoxetine – alizarin red S complex, obtained in the same manner as for method A, was measured at 594 nm after excitation at 425 nm. The fluorescence intensity was proportional to the drug concentration in the linear range of 2.7-10.2 µg/mL. The limits of detection and quantification have also been calculated. Furthermore, the proposed methods have been successfully applied for the assay of the drug in pharmaceutical dosage forms.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 6; 1293-1303
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extractive Spectrophotometric Determination of Pd(II) with Sodium salt of hexamethyleneiminecarbodithioate
Autorzy:
Dhanavate, S. D.
Garole, D. J.
Garole, V. J.
Tetgure, S. R.
Sawant, A. D.
Powiązania:
https://bibliotekanauki.pl/articles/412252.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
palladium
sodium hexamethyleneiminecarbodithioate
Extractive Spectrophotometry
synthetic mixture
Real Samples
Opis:
The reagent NaHMICdt•2H2O has found to be a good chelating agent for the spectrophotometric determination of various metal ions. The present investigation deals with spectrophotometric determination of Pd(II) by using NaHMICdt•2H2O. The reagent reacted with Pd(II) to give yellow complex extractable into toluene. Pd (II) was extracted quantitatively in the pH range 0.5-2.0. Pd(II)-HMICdt complex showed λmax at 435 nm. The extracted species has a 1:2 (M:L) stoicheometry. Beer’s law is obeyed in the range of 0.2-0.8 μg ml-1 of Pd (II). The molar absorptivity and the sandells sensitivity were found to be 0.754 x 104 lmol-1cm-1 and 0.0140 μg mol-1 cm-2 respectively. The effect of divers ion on the extraction of Pd(II) has been investigated. The proposed method is highly sensitive, selective, and simple and rapid has been applied for accurate determination of palladium in synthesis mixtures and real samples.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 4; 20-28
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement data processing in spectrophotometric analysers of food. Review paper
Autorzy:
Morawski, R. Z.
Powiązania:
https://bibliotekanauki.pl/articles/221182.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spectrophotometry
chemometrics
spectral data processing
food analysis
wine analysis
Opis:
Spectrometry, especially spectrophotometry, is getting more and more often the method of choice not only in laboratory analysis of (bio)chemical substances, but also in the off-laboratory identification and testing of physical properties of various products, in particular - of various organic mixtures including food products and ingredients. Specialised spectrophotometers, called spectrophotometric analysers, are designed for such applications. This paper is on the state of the art in the domain of data processing in spectrophotometric analysers of food (including beverages). The following issues are covered: methodological background of food analysis, physical and metrological principles of spectrophotometry, the role of measurement data processing in spectrophotometry. General considerations are illustrated with examples, predominantly related to wine and olive oil analysis.
Źródło:
Metrology and Measurement Systems; 2012, 19, 4; 623-652
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological Approach for the Synthesis and Characterization of Zinc Oxide Nanopaticles from Croton bonplandianum Baill. Extracts
Autorzy:
Manokari, M.
Shekhawat, Mahipal S.
Powiązania:
https://bibliotekanauki.pl/articles/1112329.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Croton bonplandianum
Plant extracts
UV-Visible spectrophotometry
Zinc oxide nanoparticles
Opis:
The biogenesis of nanoparticles recently gained more attention. Here, we report the biogenesis of zinc oxide (ZnO) nanoparticles using aqueous extracts of the leaves, stem, root, flowers and fruits of Croton bonplandianum Baill. at room temperature. Croton bonplandianum is an important medicinal plant used to cure many pathological conditions in the traditional systems of Indian medicines due to the presence of important and specific bioactive compounds in the plant parts of this plant. Aqueous solution of Zinc Nitrate hexahydrate [Zn(NO3)2·6H2O] was used as a precursor and the various plant extracts played as reducing agents. The formation of ZnO nanoparticles was monitored by UV-Visible spectrophotometric analysis. The leaf extract showed strong absorbance peak at 302 nm, stem and fruit at 293 nm, root at 290 nm and flowers at 305 nm.
Źródło:
World News of Natural Sciences; 2018, 19; 95-107
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of humic substances on results of the spectrophotometric (TPTZ) analysis of monosaccharides
Autorzy:
Grzybowski, W.
Dudzinska, M.
Powiązania:
https://bibliotekanauki.pl/articles/48161.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
monosaccharide analysis
aquatic substance
humic substance
spectrophotometry
water
Gdansk Gulf
Opis:
A spectrophotometric method of monosaccharide analysis was assessed with regard to its non-selectivity towards humic substances. Analysis of model solutions showed that it responds positively to both marine and terrestrial humics. The systematic error in monosaccharide analysis (in glucose equivalents) was 0.18–0.20mg per 1 mg of Aldrich humic acid and 0.11–0.12 mg per 1 mg of humic substances isolated from Gulf of Gdańsk water.
Źródło:
Oceanologia; 2004, 46, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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