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Wyszukujesz frazę "MS spectrometry" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Analiza rozmieszczenia pierwiastków w badaniach archeometrycznych z zastosowaniem mikropróbkowania laserowego w spektrometrii mas z jonizacją w plazmie indukcyjnie sprzężonej
Elemental distribution in archaeometric studies with the use of micro-destructive laser ablation inductively coupled plasma mass spectrometry
Autorzy:
Kępa, L.
Then-Obłuska, J.
Otmianowska, M.
Wagner, B.
Powiązania:
https://bibliotekanauki.pl/articles/172803.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
LA-ICP-MS
spektrometria mas z jonizacją w plazmie indukcyjnie sprzężonej
archeometria
obiekty zabytkowe
Inductively Coupled Plasma Mass Spectrometry
archaeometry
cultural heritage objects
Opis:
Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) is one of modern instrumental methods, which use in elemental analysis of cultural heritage objects has recently noticeably increased. The method requires almost no sample preparation and permits direct analysis of solid samples, availing only minute amount of the material. The micro-destructiveness of ablation processes remains usually within the scale acceptable for art historians, conservators, archaeologists and art curators, therefore the capability to perform multi-elemental, ultra trace and isotopic analysis can be fully used during studies of cultural heritage objects. The lack of appropriate matrix-matched certified reference materials and the fractionation effects, which may influence the final quantitative results to a different extent, are widely reported among the main limitations of LA-ICP-MS. Despite these constrains, LA-ICP-MS is a method that can be flexibly tuned to collect the desired elemental information about various cultural heritage objects. This paper focuses on advantages of using LA-ICP-MS in analysis of heterogeneous objects in respect of mapping of elemental distribution either during the onepoint or multi-line ablation executed directly from the surface of the investigated objects. The use of LA-ICP-MS allowed collection of chemical information availing reconstruction of distribution patterns, which reflected important structural characteristic of the small gilded decoration produced in mediaeval times (collection of Gallery of Medieval Art, the National Museum in Warsaw) and archaeological “metal-in-glass”/“sandwich” bead (Nubian collection, the Museum of Archaeology University of Stavanger, Norway). The mediaeval decoration was identified as the gilded (Ag+Au) copper object, which due to corrosion and re-painting has lost their original appearance. The bead was produced from two various types of glass and a metal foil (Ag+Au+Cu) between them. In both cases LA-ICP-MS was used successfully to determine the main elemental composition and to collect information about elemental distribution in the investigated artifact.
Źródło:
Wiadomości Chemiczne; 2015, 69, 9-10; 719-733
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maldi – metoda do zastosowań w analizie strukturalnej polimerów
Maldi – method for use in structural analysis of polymers
Autorzy:
Swinarew, B.
Swinarew, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/171598.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
polimery
spektrometria mas z jonizacją laserową wspomaganą matrycą
MALDI-TOF
kopolimery
degradacja polimeru
polymers
matrix-assisted laser desorption ionization mass spectrometry
MALDI-TOF MS
copolymers
polymer degradation
Opis:
Polymers as one of the fastest growing groups of widespread use of synthetic materials are characterized by a great diversity of structures. Structural characterization of polymers generally includes: an assessment of the average molecular weight (Mn) and the molar mass distribution (PD) to determine the structure of repeating units (mers) sequence analysis of the copolymer, identification of the end groups, the detection and identification of contaminants and substances present in the composition of the polymer asa dopant. Modern mass spectrometry (MS) offers the opportunity to study the smallest structural details of macromolecular materials [1–10]. Because of the variety of potential structures of polymer analysis process is to answer a few questions by a certain pattern. The first step is to determine the chemical structure of the polymer backbone. The second step is to identify whether the chains have branching points and define the degree of branching. The third important step is to correct end groups identification, also for the detection of cyclic oligomers that can be present. The structural studies can be made by mass spectrometer using reflectron mode. In the essence, the method involves three steps. The first analysis is performed with standard mass spectrum of the sample. Then the precursor ion (parent ion) is selected, which is subjected to further analysis by MS changed voltages and reflectron mode. This paper aims to present the issues related to the detailed analysis and characterization of polymeric materials produced on a large scale. Before, for materials such as poly(propylene), poly(ethylene), poly(styrene), polycarbonate, etc., increasing demands on the mechanical and technological parameters were placed. Maintaining a high level of products is associated with a very rigorous process control of the manufacturing, processing and transportation at every stage. The optimal tool for the structural characteristics of these polymeric materials is the defense technique MALDI-TOF MS (Matrix-Assisted Laser Desorption/Ionization Time- -Of-Flight Mass Spectrometer) due to its versatility, speed and extremely high precision. Below, we present some aspects of MALDI MS analysis of polymeric materials and composites. Note, that the following literature review focuses on the recent developments in the field of preparation of the samples, to achieve high mass resolution, the identification of polymers and copolymers, the accuracy of the molar mass determination and the identification of functional end groups, sequence analysis of the copolymer.
Źródło:
Wiadomości Chemiczne; 2014, 68, 7-8; 645-660
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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