Determination of minor alloyed elements in steel samples in radio-frequency glow discharge plasma optical emission spectrometry associated with pulsed bias-current modulation technique

Satomi Urushibata, Kazuaki Wagatsuma

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

An advanced detection method based on a modulation technique is described in radio-frequency-powered glow discharge plasma optical emission spectrometry (r.f. GD-OES). A frequency-sensitive separation using a fast Fourier transform (FFT) analyser, where a pulsated bias-current was introduced into an r.f. GD plasma, was available for improving the limit of determination for the atomic emission analysis. The FFT analyser has an ability to disperse signal components by frequency, and it is thus employed to select the component of a particular frequency. A dc bias current introduced into the GD plasma can enhance the emission intensities of analyte species greatly, and furthermore, it can be easily pulsated to modulate the emission intensities from the plasma. The modulated emission signal was selectively detected with the FFT analyser, with removing any noise components from the overall signal. The duty ratio of the pulsed bias current largely affected the amplitude of the FFT frequency components, because the pulse waveform comprised sine-function components having frequencies integral-times as much as the fundamental frequency, whose contribution coefficients depended on the duty ratio. This detection method was applied to the determination of vanadium and molybdenum in low-alloyed steel samples. The detection limits were obtained to be 6.2 × 10-3 mass% V and 2.0 × 10-3 mass% Mo in low-alloyed steel samples.

Original languageEnglish
Pages (from-to)1616-1621
Number of pages6
JournalIsij International
Volume52
Issue number9
DOIs
Publication statusPublished - 2012

Keywords

  • Bias current
  • Fast Fourier transform
  • Modulation detection
  • Optical emission spectrometry
  • Radio-frequency glow discharge plasma

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Determination of minor alloyed elements in steel samples in radio-frequency glow discharge plasma optical emission spectrometry associated with pulsed bias-current modulation technique'. Together they form a unique fingerprint.

Cite this