煤样致密度对LIBS测量的影响

Effects of coal-sampling density on the elemental analysis by using laser-induced breakdown spectroscopy

选用不同产地的3种代表性煤样为对象．采用粉状煤样和不同压力下制备成的片状煤样进行实验．以分析煤样致密度的影响．得出了粉状煤样和片状煤样在200～850nm波段内的光谱图，定性分析了C，H，O，N，Al，Fe，Ca，Mg，Si，Ti，Na和K等元素．对强度大、干扰小的C，Al，Ca，Mg，Si和Ti元素的谱线进行分析，通过谱线强度及其相对标准偏差、谱线强度比及其相对标准偏差来比较煤样致密度对定标曲线法和内标法测量的影响．实验结果表明：致密度对定标曲线法定量分析的影响较大，而对内标法定量分析的影响较小．

Three representative coals from different tigate the effects of density of samples on the coal mines were sampled for analysis： In order to invesanalysis by laser-induced breakdown spectroscopy, the powder samples and pellet samples which pressed with different pressures were selected for the ex periment. The spectra of 200-850 nm of powder and pellet coal samples were obtained, and the emission lines of components such as C, H, O, N, Al, Fe, Ca, Mg, Si, Ti, Na and K were recorded. Emission lines of C, Al, Ca, Mg, Si and Ti elements were chosen for analysis of calibration curve method and internal standardization method because of their high intensity and little interference. The results showed that the density of the samples has more effects on the calibration curve method than the internal standardization method.