Quantitative retrieval research of Pb in lead slime by laser induced breakdown spectroscopy

In order to achieve fast quantitative retrieval analysis of Pb in lead slime, PbⅠ:405.78nm was selected as the analytical line. The influences of laser energy on the laser induced breakdown spectroscopy characteristics of Pb in lead slime were discussed from three areas of spectral intensity, the ratio of signal and background and the relative standard deviation of signal. Within the range of 23.1mJ ~ 135.4mJ, line intensity increases linearly with the increase of laser energy, the ratio of signal and background increases at first and then decreases, and eventually stabilizes. The relative standard deviation of the signal decreases at first and then stabilizes with the increase of laser energy. The samples of lead slime with different mass fractions were prepared and the calibration curve of Pb was obtained. The results show that within the range of mass fraction of 0.001118~0.20115, spectrum intensity has the good linear relationship with Pb content. The correlation coefficient reaches 0.991. With this method , the relative error between measurement value and real value of Pb content of lead slime is 8.72%. This method can provide fast and quantitative retrieval measurement of Pb in lead slime.