Measurement of carbon content in coal with laser-induced breakdown spectroscopy

The feasibility of rapid quantitative analysis of coal by Laser-Induced Breakdown Spectroscopy technique was studied. The calibration curve method for LIBS quantitative analysis is introduced. Five coal samples were selected as investigation subjects, the carbon plasma line of 505.2nm was chosen as analysis spectrum line, and the carbon content of coal was analyzed quantitatively with delay of 0.8μs, 1.2μs, 1.6μs, 2.0μs and 2.4μs. The results were compared with the results measured with Element Analysis Instrument. The error measured in 1.6μs delay was the minimum, the effect of delay time on the quantitative analysis was analyzed. The results indicate that LIBS has a great potential in fast analysis of coal content.