Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Wiadomości Chemiczne

1 2003

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: zastosowanie techniki ICP-TOFMS

Sortuj według:

Ogranicz wyniki do:

Spektrometria mas z indukcyjnie sprzężoną plazmą i analizatorem czasu przelotu jonów (ICP-TOFMS)

Skrzydlewska E., Balcerzak M.

Wiadomości Chemiczne

2003

[Z] 57, 9-10

907--933

This paper presents a powerful analytical technique which uses an inductively coupled plasma (ICP) ionization source and mass spectrometric (MS) detector with a time of flight (TOF) analyzer. The technique has been introduced in 1993 and has attracted rapidly the attention of researchers in the field of atomic spectroscopy as a method that offers substantial improvement of figures of merit of widely used ICP-MS technique with quadrupole filters. A mass spectrum in ICP-TOFMS technique is generated for a packet of ions simultaneously extracted from a continuous ion beam generated in plasma and accelerated to the same kinetic energy (Ek = 0.5 mv2). Setting the ions to the same kinetic energy results in different velocities acquired by the ions of different masses. The separation of the ions of different m/z is accomplished due to different times of their passing a fixed path (field-free region) in the instrument. Extremely low time difference (nanosecond regime) between adjacent masses reflects in quasi-simultaneous detection of all isotopes reaching the detector. The technique offers extremely high speed: spectral frequency 20-30 kHz (i.e. 20000-30000 mass spectra can be accumulated per second), an ability to obtain full elemental analysis for a packet of ions extracted from a continuous ion beam and a significantly better, as compared with quadrupole ICP-MS, precision of the measurements. Analytical performance and applicability of the technique in multi-clemental analysis of various materials have been extensively examined since 1998 when the ICP-TOFMS spectrometers have been commercially available (from LECO, USA („LECO Renaissance") and GBC, Australia („Optimass 8000")). The technique has turned to be particularly suited for detection of fast transient signals generated, e.g. by laser ablation, chromatographic systems, capillary clectrophoresis and FIA. The basic principles, analytical capabilities of the ICP-TOFMS technique and characteristics of the instruments used are discussed in this paper. Analytical applications of the technique are presented.