Optimization of laser induced breakdown spectroscopy system by neurogenetic method for multi-elemental analysis of heavy metals in soil

Laser indued breakdown spectroscopy(LIBS) system was used for analysis of heavy metals (Cr, Pb, Cu, Ni, Cd, Zn) in soil. And neuro-genetic method was applied to optimize the system parameters in order to maximize the signal-background ratio of all heavy metals simultaneously. LIBS system equipped with an Andor Echelle spectrometer, coupled to an ICCD detector. A Q-switched Nd:YAG laser was used to induced plazma. Delay time, integration time, scan times of laser pluse, frequency of laser were optimized. The optimized parameters were obtained: 1μs delay time, 4.5μs integration time, 48 scan times, and 11Hz frequency of laser.