Laser-induced breakdown spectroscopy has been used to measure the organic oxygen content in pulverized anthracite coal under atmospheric conditions. Special spectral processing including the optimal O(I) emission-line selection by comparing the spectral correlation coefficients with the N(I) line, internal normalization with the N(I) line, and temperature correction are proposed and employed to satisfy the multi-line analysis method and yield the most accurate quantitative results. The calibration method for determining the organic oxygen content of coal is presented, with an accuracy of 1.15–1.37% and an average relative error of 19.39% being evaluated through an experiment performed on six anthracite coal samples. The relative measurement error distribution has also been studied.
Lei Zhang, Lei Dong, Haipeng Dou, Wangbao Yin, and Suotang Jia, "Laser-Induced Breakdown Spectroscopy for Determination of the Organic Oxygen Content in Anthracite Coal Under Atmospheric Conditions," Appl. Spectrosc. 62, 458-463 (2008)