Research on batch multielement rapid quantitative analysis based on the standard curve-assisted calibration-free laser-induced breakdown spectroscopy method

Abstract

This paper proposes a batch rapid quantitative analysis method for multi-element by combining the advantages of standard curve (SC) and calibration-free laser induced breakdown spectroscopy (CF-LIBS) technology to achieve synchronous, rapid, and accurate measurement of elements in a large number of samples, namely SC-assisted CF-LIBS. Al alloy standard samples, divided into calibration and test samples, were applied to validate the proposed method. The SC was built on the basis of the characteristic line of Pb, Cr in the calibration sample, and the content of Pb, Cr in the test sample was thereby calculated with a relative error of 6% and 4%, respectively. The SC built by Cr with multiple characteristic lines has better calculation results. The relative contents of 10 elements were calculated by CF-LIBS in the test sample. Subsequently, the SC-assisted CF-LIBS was executed, with the majority of calculation relative errors falling within the range of 2%–5%. Finally, the contents of Al, Na were predicted in the Al alloy. The results demonstrate that it effectively enables the rapid and accurate quantitative analysis of multi-element after a single element SC analysis of the tested samples. Furthermore, this quantitative analysis method was successfully applied to soil and astragalus samples, realizing the accurate calculation of the contents of multi-element. It is thus important to advancing LIBS quantitative analysis and its related applications.