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Title (Primary) Removal of water and hydrogen from graphite tubes investigated by electrothermal vaporization inductively coupled plasma mass spectrometry
Author Grünke, K.; Stärk, H.-J.; Ortner, H.M.
Journal Spectrochimica Acta Part B: Atomic Spectroscopy
Year 1997
Department ANA; SANA
Volume 52
Issue 9-10
Page From 1545
Page To 1550
Language englisch
Keywords Graphite furnace; Hydrogen; ICP-MS; Water
Abstract

Inductively coupled plasma-mass spectroscopy (ICP-MS) detection can be applied to study fundamental processes in the graphite furnace. The retention and high-temperature release of water/hydrogen and carbon under various furnace heating conditions are described in this work. Different feasible monitor masses were studied and the signal for 36ArH+ (m/z = 37) is shown to be indicative of the amount of water present. The release of carbon was monitored by measuring the integrated signal at m/z = 13.

In our study no water was found in the vaporization step using blank correction of a dry tube. However, we observed an 36ArH+ signal when the dry graphite tube was heated, even after up to 50 such heating cycles. This behavior was studied by monitoring the intensity of the 36ArH+ signal in long-term experiments with pyrolytic graphite-coated and uncoated tubes. The effect of release of water/hydrogen and carbon was significantly higher for the uncoated tubes. The source of the evolved hydrogen causing the 36ArH+ signal is supposed to be the graphite material of the tube.

The influence of the effect on selected analyte ETV-ICP-MS signals (Al, V, Cu, Pb) is described in this study.

Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=9283
Grünke, K., Stärk, H.-J., Ortner, H.M. (1997):
Removal of water and hydrogen from graphite tubes investigated by electrothermal vaporization inductively coupled plasma mass spectrometry
Spectroc. Acta Pt. B-Atom. Spectr. 52 (9-10), 1545 - 1550