A Study of the Coupling Position of the Microwave Plasma Torch

Abstract

Abstract: The microwave plasma torch(MPT) possesses a configuration with three concentric metal tubes. The microwave energy is coupled into the plasmavia a cylindrical antenna that surrounds the intermediate tube. The effects of the antenna position on MPTdischarge and performance of the plasma were studied. An end-on viewed MPTwas used in this research, and a pneumatic nebulizer was used for sampling. Four emission lines of Ar were studied to find the effect of the coupling position on the plasma background emission. At the same time, the signal intensities and the signal-background ratios of three elements(Al, Mg and V) were also studied, and RSDwas investigated also. From the research, it could be found that the analytical performance was better when the antenna position wasλ/4 than 3λ/4, except of a little poorer repeatability. The structure of electromagnetic field of the MPTwas discussed also.

Key words: Microwave plasma torch(MPT), Atomic emission spectrometry, End-on viewed

CLC Number:

O657

TrendMD:

ZHAO Li-Wei, FU Yao, SONG Da-Qian, ZHANG Han-Qi, JIN Qin-Han . A Study of the Coupling Position of the Microwave Plasma Torch[J]. Chem. J. Chinese Universities, 2001, 22(2): 201.

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A Study of the Coupling Position of the Microwave Plasma Torch

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