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1
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Nukleonika
PL Wiązki klasterów (CO2)n (n=2-18) wytwarzano metodą adiabatycznego wypływu CO2 z dyszy. Zjonizowane klastery były analizowane przy użyciu podwójnie ogniskującego, sektorowego spektrometru mas. Przy energii elektronów równej 70eV, zarejestrowano cztery serie jonów, w tym jony klasterów oraz jony ich h[...]
EN The beams of (CO2)n cluster ions (n=2-18) are studied by the adiabatic nozzle expansion of CO2 and subsequent ionization by the electron impact. They are analysed in a double focussed sector field mass spectrometer. In the case of 70 eV electron energy four homologous series of ions can be identifie[...]
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Ars Separatoria Acta
2008 No. 6 61-68
EN In this paper we address the question how the presence of an aromatic moiety affects the proton affinity of crown ethers. In order to compare the proton affinities of crown ethers studied (M), we compared the abundances of protonated crown ethers ([M + H]+ ions) with the abundance of the ion [NH2-B1[...]
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Acta Chromatographica
EN In our earlier studies, we were the first to discover a spontaneous chiral conversion of the low-molecular-weight carboxylic acids dissolved in aqueous media, running in vitro. The investigated chiral carboxylic acids belong to the classes of profen drugs, amino acids, and hydroxy acids. Then, the s[...]
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Optica Applicata
EN A laboratory study was carried out to investigate the single particle soil dust using aerosol time-of-flight mass spectrometry. The presence of crustal elements is observed in the mass spectra of individual particles. Potassium and iron constitute the two most commonly detected cations. Other common[...]
5
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Polish Journal of Chemistry
2001 Vol. 75, nr 12 1839-1846
EN A series of para-substituted azoxybenzenes was obtained as model compounds for the investigation on the mechanism of Wallach rearrangement. Oxidation of azobenzenes with hydrogen peroxide in acetic acid solution, provided mixtures of alfa and beta isomers. Some couples of the products were separated[...]
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Polish Journal of Chemistry
EN The electron impact (EI) and liquid secondary ion (LSI) mass spectra of 5-(indol-2--yl)pyrimidine derivatives are discussed. It was established that 5-(indol-2--yl)uracils, instead of the cleavage of the single carbon-carbon bond between uracil and indole ring, form stable ions with additional linka[...]
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Metrology and Measurement Systems
PL W artykule, który jest wynikiem prowadzonych w Politechnice Lubelskiej i Instytucie Fizyki UMCS badań w dziedzinie spektrometrii mas, autor przedstawił zasadę pomiarów spektrometrycznych, wykonywanych za pomocą spektrometru mas oraz zagadnienie, występującej podczas ich realizacji, niepowtarzalności[...]
EN The paper presents a principle of spectrometric measurements carried out by means of a mass spectrometer and a problem of the lack of repeatability of results obtained in that way. The author has demonstrated that lack of repeatability mainly results from fluctuations of ionising current (an electro[...]
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Eksploatacja i Niezawodność
2001 nr 2-3 54-63
PL Spektrometria mas oparta na pomiarze czasu przelotu jonów (TOF-MS Time Qf Flight Mass Spectrometry) jest obecnie szeroko stosowaną techniką ich rozdzielania. Koncepcja tego typu spektrometru zaproponowana została po raz pierwszy w 1948 roku przez A.E. Camerona. Dopiero wprowadzenie w latach 70-tych [...]
EN Time of flight mass spectrometry (TOF-MS) is a common technique used to resolve mass difference of ions. The concept of this spectrometer was proposed first time in 1948 by A.E. Cameron. Many improvements in ion source (application of nanosecond lasers) and ions optics (application of the reflectron[...]
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Challenges of Modern Technology
EN Mass spectrometry (MS) is a universal technique with a wide range of applications, including proteomic studies of different organisms, particularly the characterization and sequencing of proteins isolated from specific cellular compartments. It is used for the identification of elements exposed on t[...]
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Oceanological and Hydrobiological Studies
2016 Vol. 45, No. 4 466--484
EN Cyanobacteria are natural components of many freshwater bodies worldwide. In Russian lakes, the presence of potentially toxic cyanobacteria was also frequently observed. Our study was conducted in Sestroretskij Razliv Lake (Razliv) and Lower Suzdal Lake (Suzdal) in Saint Petersburg region, Northwest[...]
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Optica Applicata
EN Organically modified silicates (hybrid glasses) have attracted much attention in recent years because they are considered to be promising materials with easy tailorable new properties. The structure of hybrid glass is a silica network with incorporated organic particles or chains. A sol-gel process [...]
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Nukleonika
EN A procedure for the determination of chlorine isotopic ratios by positive thermal ionization mass spectrometry of the Cs2Cl+ ion has been investigated. The chlorine isotopic composition in CsCl spectroscopically pure has been measured with a precision of 0.034. The chlorine composition in sea water [...]
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Journal of Casting & Materials Engineering
EN Foundry waxes currently used in lost-wax casting technology are composed of paraffin, stearin, and – to a lesser extent – ceresin, polyethylene wax, and other natural and synthetic waxes. Most of these compounds are non-toxic; however, they may release aromatic hydrocarbons as a result of exposure t[...]
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Laboratorium Medyczne
2018 nr 1 21--23
PL Spektrometria mas znalazła miejsce w rutynowej diagnostyce laboratoryjnej, choć w Polsce są to dopiero początki. Metoda ta zapewnia unikalną czułość i selektywność oznaczeń.
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Challenges of Modern Technology
EN Many oxides are applied as a catalysts for commercially important processes. Recently, decomposition of nitrous oxide into nitrogen and oxygen have became a topic of vital interest for catalytic chemistry. Two possible ways of deN2O reaction, low temperature and high-temperature, can be d[...]
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Acta Chromatographica
2010 Vol. 22, no. 1 117--131
EN The quantitative analysis of antibiotics in different matrices is of increasing importance in in vitro studies of food-drug interactions in the drug-development process. Our objective was to develop a new, rapid and simple solid-phase extraction method without protein precipitation followed by high-[...]
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Analityka : nauka i praktyka
2008 nr 4 4-8
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Geochronometria
2007 Vol. 27 23-26
EN A newly acquired mass spectrometer MI 1201 by the Mass Spectrometry Laboratory will be adapted to determine rhenium and osmium isotope concentrations using negative thermal ionization mass spectrometry (NTIMS). We describe the principle of the Re-Os dating technique and the thermal ionization phenom[...]
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Chemik
PL Technika analityczna GC-MS jest użytecznym narzędziem do udowodnienia jakości chemikaliów. Chromatografia gazowa - spektrometr mas (GC-MS) stanowi połączenie chromatografu gazowego i spektrometru mas do identyfikacji różnych substancji w analizie próbek. Zastosowanie GC-MS obejmuje oznaczanie narkot[...]
EN Gas chromatography - mass spectrometry (GC-MS) is very useful analytical method for evaluation of the quality of chemicals. It combines the features of gas chromatography and mass spectrometry to help identify different substances within the tested sample. Applications of GC-MS include drug detecti[...]
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Acta Chromatographica
2016 Vol. 28, no. 3 429--437
EN Excoecaria lucida Sw. is an evergreen shrub widely distributed in Cuba and throughout the Caribbean region. In spite of its extended traditional use as antiasthmatic and antimicrobial by the local population, scientific reports on the species are almost nonexistent. This paper focuses on the isolati[...]
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