NDLI: Comparison of signal enhancement by co-existing carbon and by co-existing bromine in inductively coupled plasma mass spectrometry

Content Provider	Royal Society of Chemistry (RSC)
Author	Furuta, Naoki Sakuma, Hironori Suzuki, Daisuke Nakazawa, Takashi
Copyright Year	2014
Abstract	In inductively coupled plasma (ICP) mass spectrometry, signal enhancement by co-existing carbon results from multiple factors. To elucidate the signal enhancement factors, we compared the effects of co-existing carbon and co-existing bromine, which have similar ionization energies (C, 11.26 eV; Br, 11.81 eV). We eliminated the effect of sample introduction efficiency changes, which are considered to be one reason for signal enhancement, by using two nebulizers. The intensities of the P, I, S, As, Se and B signals were enhanced when a multi-element solution was introduced into the ICP from one nebulizer and a carbon solution was introduced from the other. No signal enhancement was observed by co-existing bromine. We focused on the bond energies of the oxides as a possible explanation for the difference between the results for carbon and bromine. Carbon oxide has a higher bond energy than bromine oxide, and therefore carbon reduces analyte oxides more readily than bromine does. We also considered the effects of the bond energies of the analyte oxides, as well as the effects of the degree of analyte ionization in the ICP, on signal enhancement. Signal enhancement was observed for analytes that were less than 60% ionized in the ICP and whose oxide bond energies exceeded 450 kJ mol−1. Iodine was an exception; signal enhancement was observed for I (ionization degree, 29.85%), even though the bond energy of iodine oxide is only 240 kJ mol−1. Therefore, charge transfer could not be eliminated as a cause of signal enhancement.
Starting Page	1299
Ending Page	1305
Page Count	7
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	29
Issue Number	7
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/c4ja00059e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	ICP Inductively coupled plasma Mass spectrometry Carbon Bromine Ionization Electronvolt Nebulizer No Signal Chemical bond Bond energy Bromine oxide Analyte Iodine Iodine oxide
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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