利用蒙脱石富集实现水中痕量铬的LIBS测量

发布时间：2018-03-04 22:33

本文选题：激光诱导击穿光谱　切入点：重金属　出处：《激光杂志》2017年04期 　论文类型：期刊论文

【摘要】：为了实现激光诱导击穿光谱(LIBS)技术对自然水体中痕量铬(Cr)元素的快速检测,实验以蒙脱石为吸附基底,对溶液中的Cr元素富集后进行LIBS测量。通过分析样品的发射光谱特性,确定了425.4 nm的特征谱线为Cr的分析线;并基于不同参数条件下分析线的强度和信噪比,得出最佳激光光斑尺寸为50μm,最优的激光能量为40.8 m J,最佳延迟时间为5μs。在最佳实验参数条件下,建立了水体中Cr元素的定标曲线,拟合结果显示,线性相关系数为0.989,检测限达到0.33 mg/L。研究结果为水体中重金属元素的LIBS测量提供了一种新途径。
[Abstract]:In order to realize the rapid detection of trace Cr (Cr) elements in natural water by laser induced breakdown spectroscopy (LIBS), the absorption substrate of montmorillonite was used to measure the concentration of Cr in solution by LIBS. The emission spectra of the samples were analyzed. The characteristic spectral line of 425.4 nm is determined to be the analysis line of Cr, and the intensity and signal-to-noise ratio of the analysis line are calculated under different parameters. The optimum laser spot size is 50 渭 m, the optimal laser energy is 40.8 m J, and the optimal delay time is 5 渭 s. Under the optimum experimental parameters, the calibration curve of Cr element in water is established, and the fitting results show that, The linear correlation coefficient is 0.989 and the detection limit is 0.33 mg / L. the results provide a new way for the LIBS measurement of heavy metals in water.
【作者单位】：长江大学物理与光电工程学院;
【基金】：国家自然科学基金(41403083) 湖北省教育厅科学技术研究项目(D20141305)
【分类号】：TN249

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