Abstract
In inductively coupled plasma based techniques the signal enhancing effect of carbon on high ionization potential elements is not only caused by changes in the nebulization efficiency and charge exchange reactions, but also by increased plasma power density and the state of matter of the introduced carbon species.
Highlights
The introduction of larger quantities of carbon into the inductively coupled plasma (ICP) instrument is reported to increase the sensitivity of elements with the ionization potential (IP) in the range of about 9 to 12 eV.[1,2,3,4,5,6,7,8,9,10,11,12,13,14]
It is important to note that the Texc reported here represents an average temperature of the region in the ICP that is observed by the spectrometer
The power control algorithm that regulates current and voltage fed to the power electronics can be expected to have a great in uence on the stability of the RF generator when loading the ICP with large amounts of carbon
Summary
The introduction of larger quantities of carbon into the inductively coupled plasma (ICP) instrument is reported to increase the sensitivity of elements with the ionization potential (IP) in the range of about 9 to 12 eV.[1,2,3,4,5,6,7,8,9,10,11,12,13,14] This enhancement has been observed in both inductively coupled plasma optical emission spectrometry (ICP-OES) and inductively coupled plasma mass spectrometry (ICP-MS) This “carbon enhancement effect” was reported nearly 25 years ago,[1] the understanding of the underlying mechanism is still unsatisfactory as apparent from the many con icting results published since . Whereas for Au (IP 9.23 eV)[1,13,18] and Be (IP 9.32 eV)[4] carbon induced signal enhancement is reported, for Zn (IP 9.39 eV), S (IP 10.36 eV), Hg (IP 10.44 eV) and I (IP 10.45 eV) both carbon induced enhancement[1,4,5,7,13,15,16,17] and the absence of this effect[1,12,16] are reported
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