Comparative investigation of the emission characteristics between 6.78-MHz radio-frequency and direct-current glow discharge plasmas for atomic emission spectrometry

2018 ◽  
Vol 147 ◽  
pp. 109-114 ◽  
Author(s):  
Xinyue Zhang ◽  
Kazuaki Wagatsuma
Keyword(s):  
Glow Discharge ◽  
Radio Frequency ◽  
Direct Current ◽  
Atomic Emission ◽  
Comparative Investigation ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
Emission Characteristics ◽  
Discharge Plasmas

Comparison between Direct-Current and Radio-Frequency Gas-Jet-Boosted Glow Discharge Atomic Emission Spectrometry for the Analysis of Steel

1997 ◽  
Vol 51 (7) ◽  
pp. 1060-1066 ◽  
Author(s):  
Won B. Cho ◽  
Young A. Woo ◽  
Hyo J. Kim ◽  
Il J. Kim ◽  
Won K. Kang
Keyword(s):  
Weight Loss ◽  
Glow Discharge ◽  
Radio Frequency ◽  
Direct Current ◽  
Atomic Emission ◽  
Gas Jet ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
Sample Weight ◽  
Sample Weight Loss

Comparisons between direct-current (dc) and radio-frequency (rf) gas jet-boosted glow discharge atomic emission spectrometry (GD-AES) have been made with regard to fundamental characteristics and analytical performance. The study of fundamental characteristics includes the voltage—current relationship; a gas flow rate of 0 mL/min to 800 mL/min and pressures ranging from 3 Torr to 5 Torr on dc bias potential; the sample weight loss; and the emission intensity. The dc-powered glow discharge at 90 mA/450 V and 60 mA/710 V at 5 Torr shows 3 × more sample weight loss than the rf discharge at 40 W. Radio-frequency glow discharge shows a short-term precision of <1% relative standard deviation (RSD) and a long-term stability of <5% RSD for both major and trace element lines. Both rf and dc show calibration curves that are linear over 2–3 orders of magnitude, with a general improvement in linearity from ratioing the signal to an internal standard of the matrix. Further improvement of linearity was possible by correcting the bias potential in the rf glow discharge. Limits of detection (LODs) for rf are tens of parts per billion from many trace elements in low-alloy steel, which is one order of magnitude improvement over those for dc.

Emission Characteristics of Jet Configurations for Jet-Boosted Glow Discharge Atomic Emission Spectrometry

1998 ◽  
Vol 59 (3) ◽  
pp. 399-412 ◽  
Author(s):  
Hyo J. Kim ◽  
Yang S. Park ◽  
Gae H. Lee ◽  
Kee B. Lee ◽  
Hasuck Kim ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Atomic Emission ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
Emission Characteristics

Atomic Emission Spectrometry Employing a Pulsed Radio-Frequency-Powered Glow Discharge

1993 ◽  
Vol 47 (12) ◽  
pp. 2096-2101 ◽  
Author(s):  
Changkang Pan ◽  
Fred L. King
Keyword(s):  
Glow Discharge ◽  
Radio Frequency ◽  
Coal Fly Ash ◽  
Analytical Signal ◽  
Atomic Emission ◽  
Separation Distance ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
Emission Signal ◽  
Discharge Pressure

A radio-frequency (rf)-powered glow discharge pulsed at 50 Hz with a 25% duty cycle is used as an atomization/excitation source for analytical atomic emission spectrometry. Compromise working conditions are established at 0.8 Torr argon pressure and 80 to 90 W peak applied power. Analyte emission intensities are found to increase with increases in discharge pressure and peak applied rf power to an upper limit corresponding with the onset of discharge instability. The observed emission signal intensity is influenced strongly by changes in the cathode-to-anode separation distance. Long-term analytical signal stability is exhibited by this source at rf powers up to 90 W in the absence of external cooling because of operation in the pulsed mode. The maximum attainable stable emission signal with pulsed operation is approximately four times greater than that attainable with steady-state operation. The analytical utility of this source is demonstrated through determinations of trace elements in coal fly ash and graphite samples with limits of detection in the tens of parts-per-million range.

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