Determination of Sulfur Content in Steel by Laser-Produced Plasma Atomic Emission Spectroscopy

Abstract

Sulfur content in steel samples has been determined by laser-produced plasma atomic emission spectroscopy with the use of a Q-switch Nd: YAG laser. With the use of time-resolved spectroscopy employing an OMA III (EG&G) as detector, a detection limit of 70 ppm and a precision of 7% have been obtained. Calibration curves are linear, and no noticeable matrix effects have been observed.

Detection of sulfur dioxide in air by laser induced breakdown spectroscopy

“…This detection limit was relatively higher than that of solid samples, for example, about 5 times higher than the one obtained by Gonzalez et al on the detection of sulfur in steel 11 , but the lowest one of sulfur in gaseous phase samples, it was about 4 times lower than the one obtained by Dudragne et al on the detection of gaseous SF 6 in air 6 .…”

“…It is therefore imperative to reduce the background and increase the Signal-to-Background Ratio(SBR). To the end, we studied the impact of laser pulse energy and gate delay to determine the most appropriate experimental conditions for SO 2 LIBS detection 11 . In the experiment, the laser pulse energy can be changed systematically by adjusting the aperture.…”

Metallurgical Consideration on the Calibration Curve for Binary Alloy Samples in Low-pressure Argon Laser-induced Plasma Spectrometry

“…7,8 The plasma commonly yields the most intense radiation just after the breakdown but the background intensity also becomes high, which requires to set criteria under consideration of the background strength. 9,10 Also, if an internal standard line is selected, it should exhibit a similar temporal variation in the intensity to that of the analytical line. A time interval for measuring the emission intensity (gate width) and a waiting time to start the measurement after the breakdown (delay time) are important experimental factors.…”

Quantitative elemental analysis of nickel alloys using calibration-based laser-induced breakdown spectroscopy

“…The slope of the calibration curve that represents the sensitivity and the regression coefficient of the calibration curve that represents the precision are the two important parameters affecting the analytical predictive capability of the LIBS system to unknown samples. Several LIBS research papers on metallic solid samples in air at atmospheric pressure have been published in the literature where the calibration curves are obtained with varying slopes and regression coefficients [6][7][8][9][10][11][12][13][14][15]. But, to the best of our knowledge, their effect on the correlation of the LIBS determined concentration with that determined by any other analytical method is not reported in the literature.…”