Analysis of Carbon Contents and Heavy Metals in Coal Samples Using Calibration-free LIBS Technique

Figure 4

(a) Boltzmann plots built without self-absorption corrections of Fe I and II emission lines; the red lines linearly fit the experimental data points. (b) Boltzmann plots built with self-absorption correction on the Fe I and II emission lines; the red lines linearly fit the experimental data points.

(a)

(b)