Quantitative Analysis of Mg, Fe and Ca in Jade with Laser Induced Breakdown Spectroscopy

Based on laser induced breakdown spectroscopy and X-ray fluorescence spectroscopy, The calibration curve of the main elements Mg, Cr and trace element Fe in the Jade samples is obtained based on experimental results. In the experiment, LIBS experiment conditions were 3 μs delay, 110 accumulated laser pulse, 100 mJ·pulse-1, 10 Hz pulse repetition frequency, plasma in Nanyang jade was induced using nono-second Nd∶YAG (wavelength: 1 064 nm) laser as the excitation source in the atmosphere envtronment of the laboratory. The spectral lines in the 300~1 000 nm wavelength range have been identified with the laser-induced breakdown spectroscopy. Through comparing the characteristic spectrum with the National Institute of standards and Technology Research Institute (NIST) database, the element of Mg, Ca and Fe are found in the Jade samples. Using the X-ray fluorescence spectra analyzed the metal elements Mg, Cr and Fe in Nanyang standard jade and obtained the content of elemental oxides, taking the content as standard data and selecting the high content element Al as internal standard element. According to LIBS calibration curve, we can calculate the content of 3 elements in the measured sample. The result shows that the concentration of elements locate in their corresponding standards range, for example, go(0.28%~1.73%), and Fe2O3 (0~0.8%), CaO ( 18%~20%).Because of its unique features, like the absence of sample preparation, the ability to perform real-time, and in situ analysis as well as the quasi non-destruction and micro-analysis character of the measurements, so as to verify the feasibility of LIBS application in jade.