利用蒙脱石富集实现水中痕量铜元素的激光诱导击穿光谱测量

为了实现激光诱导击穿光谱(LIBS)技术对自然水体中痕量Cu元素的快速检测，实验以蒙脱石粉末为吸附基底，富集溶液中的Cu元素后进行LIBS测量。分析样品的发射光谱特性后确定了324.7 nm特征谱线为Cu的分析线；基于不同参数条件下分析谱线的强度和信噪比，得出最佳激光光斑尺寸为100 μm，最优激光能量为45.9 mJ，最佳延迟时间为3 μs。在最佳实验参数条件下，建立了水体中Cu元素的定标曲线，拟合结果显示，线性相关系数为0.996，检测限达到0.03 mg/L。利用该方法对不同地点采集的水样进行检测，所测结果与电感耦合等离子原子发射光谱法测量结果一致，表明该方法可用于自然水体中Cu元素的测量。

Abstract

In order to achieve rapid and highly sensitive detection of copper in natural water by laser-induced breakdown spectroscopy (LIBS), the water samples were analyzed by LIBS after copper therein was enriched by montmorillonite substrate. According to the emission spectral characteristics of copper enriched on the solid substrate, the characteristic spectral line of copper at 324.7 nm was chosen as the analytical line of copper. Measurements of the intensity and signal to noise ratio of the analytical line in different parameter occasions show that the optimal laser spot size is 100 μm, the optimal pulse laser energy was 45.9 mJ, and the optimal delay time is 3 μs. Under the optimized experimental conditions, the calibration curve of copper was established. The linear correlation coefficient with 0.996 indicates a good linear relationship between the copper concentration in water and the intensity of the analytical line. The detection limit for copper in water reached 0.03 mg/L. Furthermore, the method was used to determine the copper concentration in water samples collected from different sites. The measurement results are consistent with those measured by the inductively coupled plasma-atomic emission spectrometry, indicating that the method can be applied in the measurement of trace copper in natural water.

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吴青峰, 郝东元, 石俊, 黄达, 陈善俊, 熊艳, 王阳恩. 利用蒙脱石富集实现水中痕量铜元素的激光诱导击穿光谱测量[J]. 激光与光电子学进展, 2016, 53(11): 113003. Wu Qingfeng, Hao Dongyuan, Shi Jun, Huang Da, Chen Shanjun, Xiong Yan, Wang Yang′en. Measurement of Trace Copper in Water by Laser-Induced Breakdown Spectroscopy Using Montmorillonite Substrate[J]. Laser & Optoelectronics Progress, 2016, 53(11): 113003.

利用蒙脱石富集实现水中痕量铜元素的激光诱导击穿光谱测量

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