Elemental analysis in environmental land samples by stand-off laser-induced breakdown spectroscopy

摘要: The stand-off detection and analysis of environmental land samples have been demonstrated using laser-induced breakdown spectrometry. interest included soils vegetation powder. Elements Hg, As, Pb, Zn, Cd Cr spectrally analysed with a focus on Hg as trace contaminant in the samples. It is found that element Fe, usually contained samples, main source spectral interference for due to its ever present iron emission line at 253.68 nm closely adjacent strongest 253.65 nm, hence, high resolution necessary. strong signals from Bremsstrahlung plasma atomic Fe concentration caused significant reduction use image intensifier an ICCD. limit ~8 ppm soil minor constituent has achieved, optical chopper CCD detector spectroscopy (LIBS) signal detection. Such method LIBS system shown great advantage determining elements interfering elemental constituents sample matrixes.