水泥中MgO含量的激光诱导击穿光谱测量方法研究

发布时间：2018-01-11 10:07

本文关键词：水泥中MgO含量的激光诱导击穿光谱测量方法研究　出处：《中国激光》2014年06期 　论文类型：期刊论文

【摘要】：氧化镁是水泥中要求准确测定的主要物质之一。利用激光诱导击穿光谱(LIBS)技术对普通硅酸盐水泥样品进行了等离子体光谱分析。选择Mg I 517.2nm特征谱线作为分析线,测量了不同激光能量下的光谱信号强度以及对应的信噪比,确定了最佳激光能量为40mJ。为减小实验误差,将Mg 517.2nm的光谱强度和516~520nm的光谱强度积分之比作为内标,建立了MgO质量分数测定的定标曲线,定标曲线的线性系数达到了0.9959。采用循环反演的方法检测了MgO定量分析的测量精度,最大相对偏差和平均相对偏差分别为5.9%和2.48%,LIBS对水泥样品中的MgO质量分数的检测限达到了0.51%。
[Abstract]:Magnesium oxide is one of the main substances required for accurate determination in cement. Laser induced Breakdown Spectroscopy (LIBS). The plasma spectra of ordinary Portland cement samples were analyzed by plasma spectrometry, and the characteristic spectral lines of mg I 517.2 nm were selected as the analytical lines. The spectral signal intensity and the corresponding signal-to-noise ratio (SNR) at different laser energies were measured, and the optimum laser energy was determined to be 40mJ. in order to reduce the experimental error. Using the ratio of spectral intensity of mg 517.2 nm and spectral intensity integral of 516 ~ 520nm as internal standard, the calibration curve for determination of MgO mass fraction was established. The linear coefficient of calibration curve is 0.99599.The accuracy of MgO quantitative analysis is detected by cyclic inversion method. The maximum relative deviations and average relative deviations were 5.9% and 2.48% respectively. The detection limits of MgO in cement samples were 0.51% and 0.51%, respectively.
【作者单位】：西南科技大学信息工程学院;西南科技大学极端条件物质特性联合实验室;
【基金】：国家863计划(2009AA063002) 四川省科技支撑计划(2011GZ0249)
【分类号】：O657.31;TQ172.18
【正文快照】： 1引言安定性是判断水泥质量好坏的一项重要指标,水泥的安定性不良会使水泥硬化体开裂,强度降低,引起结构破坏,造成严重的经济损失甚至导致人员0615001-1伤亡[1]。水泥中的MgO含量过高会严重影响水泥的安定性,因此必须严格按照国标控制水泥中MgO含量。现有的水泥中MgO含量的测

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