水泥中Al 和Fe 的激光诱导击穿光谱测量分析

水泥中铝和铁含量是对水泥进行分类和质量监督的一个重要依据。通过采用激光诱导击穿光谱技术对水泥样品中的Al和Fe含量进行了定量分析。从光谱强度以及特征谱线信噪比出发,确定单脉冲能量为30 mJ光谱积分延迟时间为1 s为最佳实验参数并以此为基础采用内标法去定量分析水泥样品中的Al和Fe。通过内标法建立的Al和Fe元素的定量分析曲线的线性度分别达到了0.998和0.997,同时通过循环反演的方式去检测定量分析的精度,得到铝和铁的最大测量相对偏差分别为2.32%和5.11%,平均相对偏差为1.34%和2.40%。实验结果表明:采用激光诱导击穿光谱去定量分析水泥样品中的Al和Fe在一定的误差范围内是可行的。

Determination of Al and Fe in cement by laser-induced breakdown spectroscopy

The Al and Fe content in cement is one of the bases of classification and quality evaluation of cement. Laser-induced breakdown spectroscopy (LIBS) was used to quantitatively analyze the Al and Fe content in cement samples. According to the intensity of spectral lines and SNR,it was confirmed experimentally that the laser energy 30 mJ and delay time 1 us were the best experimental parameters for single pulse laser induced breakdown spectroscopy to detect the Al and Fe in cement. Internal standard method was used to establish the calibration curve,the correlation coefficients of Al and Fe were 0.998 and 0.997. Using cycle inversion method to detect the accuracy of quantitatively analysis,it was found that the maximum relative error of Al and Fe were 2.32% and 5.11% while the average relative error were 1.34% and 2.40%. Experimental results show that the use of laser-induced breakdown spectroscopy on quantitative analysis of Al and Fe is feasible.