| Autor: |
Amad, Ma'an H., Houk, R. S. |
| Zdroj: |
JAAS (Journal of Analytical Atomic Spectrometry); April 1998, Vol. 13 Issue: 4 p223-228, 6p |
| Abstrakt: |
The axial channel of a conventional argon inductively coupled plasma (ICP) is extracted through a circular orifice into an evacuated quartz chamber. Emission from the Mach disk region is focused on the entrance slit of an echelle spectrometer equipped with two segmented-array charge-coupled-device detectors. The background pressure in the extraction chamber is 1000 Pa (7.5 torr). At this pressure two barrel shocks and Mach disks are visible. Deliberate use of a mild secondary discharge between the plasma and the sampler enhances emission from the Mach disk for a variety of lines from typical analytes (Ca, Sr, Mg and Mn) by factors of 11 to 25. Detection limits are in the range 0.12 μg l−1. Sodium chloride at concentrations up to 10 000 mg l−1 induces only a modest loss (06%) of intensity for ion lines, in contrast to the much more severe matrix effects seen in ICP mass spectrometry. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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