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Vaporization and atomization of the platinum group elements in the graphite furnace investigated by electrothermal vaporization-inductively coupled plasma-mass spectrometry
- Source :
- Spectrochimica Acta Part B: Atomic Spectroscopy. 52:1575-1586
- Publication Year :
- 1997
- Publisher :
- Elsevier BV, 1997.
-
Abstract
- The mechanisms by which the platinum group elements (PGEs) are vaporized in the graphite furnace have been investigated using electrothermal vaporization-inductively coupled plasma-mass spectrometry (ETV-ICP-MS). The results suggest that live of these elements (Ru, Rh, Pd, Ir and Pt) are reduced to their metallic state in the graphite furnace and then vaporized by direct sublimation of the metal. For Os, the vaporization mechanism is different. In the presence of HNO3, two distinct vaporization processes are observed. Volatile oxides of Os are released at low temperatures, but some of this oxide is reduced to relatively involatile Os metal which is then vaporized when the temperature is increased above 2000°C. The addition of TeCl2 chemical modifier was found to have minimal effect on the vaporization mechanism and sensitivity for determination for five of the PGEs. For Os, however, the analytical sensitivity and limit of detection was improved when Te modifier was used in conjunction with a lower vaporization temperature of 1400°C. Optimum conditions for the determination of the PGEs by ETV-ICP-MS are reported, along with their absolute limits of detection; these range from 0.015 pg for Ir to 0.25 pg for Os.
- Subjects :
- Detection limit
Oxide
Analytical chemistry
Mass spectrometry
Atomic and Molecular Physics, and Optics
Analytical Chemistry
law.invention
chemistry.chemical_compound
chemistry
law
Vaporization
Sublimation (phase transition)
Graphite
Atomic absorption spectroscopy
Instrumentation
Inductively coupled plasma mass spectrometry
Spectroscopy
Subjects
Details
- ISSN :
- 05848547
- Volume :
- 52
- Database :
- OpenAIRE
- Journal :
- Spectrochimica Acta Part B: Atomic Spectroscopy
- Accession number :
- edsair.doi...........efcd1594ffa8086f2bcbafb624d05e82