Wyniki wyszukiwania - BazTech

1

Mobile gas chromatographs coupled with mass and ion mobility spectrometers and their applications

Witkiewicz Zygfryd, Wardencki Waldemar

Ecological Chemistry and Engineering. S

|

2021

|

Vol. 28, nr 1

29--37

EN

Chemical analysis of different materials at the place where analytes are present (on-site analysis) has several advantages in comparison to analysis of these materials after delivering the samples to laboratory. Mobile devices, possessing expected properties in terms of using energy, mass and volume are needed for such analyses. The obtained results should be comparable to those obtained with the stationary instruments. Mass and ion mobility spectrometers are examples of the instruments fulfilling these requirements. At the beginning, the article describes the developments in combining of mass and ion mobility spectrometers (MS, IMS) with miniature gas chromatographs (GC). Both systems are used for analyses in the field, mainly for determination of environmental pollutions. They are used not only for analysis of typical chemicals present in different environmental compartments (in air, water and soil samples) but also for analysis of explosives, drugs and chemical warfare agents when fast results are needed. Particularly noteworthy is their applications in space exploration on the International Space Station. The selected examples of applications of miniaturised GC-MS and GC-IMS devices are presented in the second part of this mini review.

2

Preparation of wastewater samples for GC-MS analysis of PAHs

Włodarczyk-Makuła M.

Archives of Environmental Protection

|

2008

|

Vol. 34, no. 3

259-264

EN

Standard EPA Method 8310 recommends the use of liquid chromatography with fluorescence detection for the determination of PAH compounds. Taking into consideration the advantages of gas chromatography - mass spectrometry (GC - MS) it is important to carry out investigations to optimise wastewater preparation for qualification and quantification of PAHs using this method. The aim of the investigation was to verify the procedure of wastewater preparation for PAHs analysis using GC-MS. The method was evaluated based on experimental recovery values of individual compounds. The experiments were carried out using both raw and biologically treated wastewaters collected from a municipal treatment plant.

3

Identyfikacja modyfikacji posttranslacyjnych peptydów

Hartmer R., Lubeck M.

Laboratorium - Przegląd Ogólnopolski

|

2006

|

nr 8-9

46--48

PL

Nowatorski system tandemowej spektrometrii mas tandemowej spektrometrii mas (PTM Discovery System), oferuje użytkownikowi możliwość zastosowania dwóch różnych metod fragmentacji MS: CID (ang. – collision induced dissociation) oraz ETD (ang. – electron transfer dissociation), których wyniki doskonale się uzupełniają. Informacje uzyskane przy pomocy obu technik idealnie nadają się do analizy modyfikacji posttranslacyjnych (PTM) białek, np. fosforyzacji. Fragmentacja oparta na metodzie ETD, podobnie jak powszechnie znana metoda CID, pozwala na szybką identyfikację peptydów w połączeniu z technikami rozdziału online.

EN

A novel tandem mass spectrometry instrument (PTM Discovery System) offers the application of two different MS fragmentation techniques (i.e. collision induced dissociation, CID, and electron transfer dissociation, ETD) showing highly complementary fragmentation results. The information obtained from both techniques is ideally suited for the characterization of post translational modification (PTM), such as phosphorylation. ETD based fragmentation shows a similar short duty cycle as common CID, allowing fast peptide identification and characterization in combination with online separation techniques.

4

Spektrometria masowa o wysokiej rozdzielczości HR-ICP-MS. Cz. 1

Garboś S.

LAB Laboratoria, Aparatura, Badania

|

2001

|

R. 6, nr 4

12, 48

5

Precyzja pomiaru ilorazu m/e metodą dwuhallotronową w spektrometrze mas z wybieraniem magnetycznym

Sikora J.

Eksploatacja i Niezawodność

|

2001

|

nr 2-3

114-117

PL

W pracy zostało przedstawione urządzenie do identyfikacji rodzaju prądu jonowego w spektrometrach z wybieraniem magnetycznym. W spektrometrach tego typu iloraz m/e jest wprost proporcjonalny do kwadratu indukcji magnetycznej. W opisanym urządzeniu sygnał napięciowy będący miarą ilorazu m/e został uzyskany za pomocą dwóch hallotronów umieszczonych w szczelinie elektromagnesu. Wyniki badań eksperymentalnych potwierdzają korzystne właściwości metrologiczne (precyzję) opracowanego urządzenia.

EN

In this paper the device for identification of the ion beams in a magnetically scanned mass spectrometer is considered. For mass spectrometers with magnetic scanning the m/e ratio is directly proportional to the square of the magnetic field strength. In the device described a voltage signal precisely matching the ratio m/e is obtained by means of two Hall probes placed into the gap of the electromagnet. Results of the experimental testing confirm the advantageous metrological properties (precision) of the recently developed device.

6

Zastosowanie spektrometrii masowej cyklotronowego rezonansu jonowego do badania reakcji przeniesienia protonu w fazie gazowej

Raczyńska E.D.

Wiadomości Chemiczne

|

1998

|

[Z] 52, 5-6

385-403

EN

The principle of ion cyclotron resonance (ICR) reported in 1930 by Lawrence et al. [9] was firstly applied in mass spectrometry by Hipple, Sommer and Thomas in 1949 [26]. Their instrument has never been commercilized due to several problems with electronics and vacuum. Next instrument constructed by Wobschall et al. In the 1960s [27] had more chamce. It was modified by Llewellyn [28] in cooperation with Baldeschwieler et al. [29] and became a commercial Varian mass spectrometer in the late 1960s. Its drift cell contained three separated regions: ion source, analyser and ion collector. Important modification in ICRMS was proposed by McIver in 1970 [10a, b]. He introduced a one region trapped-ion analyzer cell and pulsed mode of operation. First FT-ICR experiments were carried out by Comisarow and Marshall in 1974 [11]. They also applied a one region trapped-ion analyzer cell. The pulsed mode of operation in the one region cell was combined with Fourier transform techniques in first commercial Nicolet FT-ICR mass spectrometer. From this moment the FT-ICR mass spectrometry has become more attractive and more frequently used by chemists. Since ions may be trapped for extended periods prior to detection in an ICR cell, both, ICR and FT-ICR mass spectrometry have been used to the study of gas-phase ion-molecule reactions [1-6]. First experimental gas-phase data of sufficient precision obtained by ICRMS became available from the 1970s for the proton-transfer reactions [2, 7, 8, 10, 41-43]. Relative acidity (DGA) or basicity (DGB) determinations were based on measurements of the equilibrium constants of proton exchange between two anions (A-1 and A-2) or two bases (B1 and B2) [7, 8, 13a]. These reactions have been studied in order to determine intrinsic gas-phase acidities or basicities of compounds and to establish general gas-phase acidity/basicity scale. Presently there are few thousands gas-phase data compiled in this scale by Lias et al. [50]. The upper limit of the GB scale is separated from the lower limit of the GA scale by ca 150 kJ/mol (Fig. 6), and thus spontaneous neutralization reactions between neutral acids and bases can not yet be observed in the gas phase.

7

Zastosowanie spektrometru masowego typu "mass-reflectron" w badaniach jednorodności przestrzennej składu chemicznego i domieszkowania stopów lekkimi pierwiastkami

Mróz W., Antonik A., Norek P., Prokopiuk A., Jóźwiak S., Bojar Z., Bystrzycki J., Mamyrin B. A., Schmikk D. V., Kirillov N. S.

Krzepnięcie Metali i Stopów

|

1998

|

nr 36

309--315

PL

W pracy zaprezentowano możliwości zastosowania spektrometru masowego typu, "mass-reflectron" do badań jednorodności przestrzennej składu chemicznego i domieszkowania stopów metali lekkimi pierwiastkami. Na podstawie wykonanych badań stopów intermetalicznych wykazano użyteczność prezentowanej metody w zakresie analizy jednorodności głównych składników stopowych: Al, Fe, Cr jak również lekkich domieszek: H, C, O.