CF-LIBS; internal reference self-absorption correction (IRSAC); brass; quantitative analysis; plasma parameters; energy dispersive x-ray spectroscopy (EDX); laser ablation time-of-flight mass spectrometry (LA-TOF-MS);INDUCED BREAKDOWN SPECTROSCOPY; CALIBRATION-FREE; ELEMENTAL ANALYSIS; PLASMA TEMPERATURE; PARAMETERS; ACCURACY
We present a quantitative analysis of a brass alloy using laser induced breakdown spectroscopy, energy dispersive x-ray spectroscopy (EDX) and laserablation time-of-flight mass spectrometry (LA-TOF-MS). The emission lines of copper (Cu I) and zinc (Zn I), and the constituent elements of the brass alloy were used to calculate the plasma parameters. The plasma temperature was calculated from the Boltzmann plot as (10 000 +/- 1000) K and the electron number density was determined as (2.0 +/- 0.5) x 10(17) cm(-3) from the Stark-broadened Cu I line as well as using the Saha-Boltzmann equation. The elemental composition was deduced using these techniques: the Boltzmann plot method (70% Cu and 30% Zn), internal reference self-absorption correction (63.36% Cu and 36.64% Zn), EDX (61.75% Cu and 38.25% Zn), and LA-TOF (62% Cu and 38% Zn), whereas, the certified composition is (62% Cu and 38% Zn). It was observed that the internal reference self-absorption correction method yields analytical results comparable to that of EDX and LA-TOF-MS.