Analytical characterisation of a capacitively coupled plasma torch with a central tube electrode.
A new type of radiofrequency capacitively coupled plasma torch is presented. The torch electrode geometry is coaxial with a tubular central electrode and one or two outer ring electrodes. The argon plasma is generated at 275 W radiofrequency power and 27.12 MHz and it has a very good stability and a low gas consumption of 0.4 l min(-1). The nebulized sample is introduced through the tubular electrode into the core of the annular shaped plasma thus achieving a better atomisation and a lower background. The limits of detection for 20 elements are in the range of ng ml(-1) and the dynamic range between 2.5 and 3.5. The best results are obtained with the torch with two outer ring electrodes.
Cordos
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University of Cluj, Department of Chemistry, 3400 Cluj-Napoca, Romania.
Frentiu
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T
Rusu
A M
AM
Angel
S D
SD
Fodor
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A
Ponta
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M