Detection of heavy metal elements in fume by laser-induced breakdown spectroscopy

An experimental system by laser-induced breakdown spectroscopy ( LIBS)was established. The plasmas were induced by Nd: YAG laser breakdown in fume. The emission spectra of plasmas were then dispersed by an Echelle spectrograph and detected by an intensified charge-coupled device (ICCD). Respectively, the fumes from the coal combustion and firecracker combustion were detected by LIBS. The spectra have been obtained using the experimental system. A lot of heavy metal elements was detected all together by LIBS from the spectra. The calibration of line intensity versus concentration of Pb element in solid samples has been made, and the slope was linear.