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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324.7nm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100μm,最优激光能量为45.9mJ,最佳延迟时间为3μs。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0.03mg/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。
In order to realize the rapid detection of trace Cu in natural water by Laser Induced Breakdown Spectroscopy (LIBS), montmorillonite powder was used as the adsorption substrate, and the Cu element in the solution was enriched for LIBS measurement. The characteristic line of 324.7nm was determined as the analytical line of Cu after analyzing the emission spectral characteristics of the sample. Based on the analysis of spectral intensity and signal-to-noise ratio under different parameters, the optimum laser spot size was 100μm and the optimal laser energy was 45.9mJ, the best delay time is 3μs. Under the optimal experimental conditions, the calibration curves of Cu element in water were established. The fitting results showed that the linear correlation coefficient was 0.996 and the detection limit was 0.03 mg / L. The water samples collected from different locations were detected by this method. The measured results are in good agreement with the results of inductively coupled plasma atomic emission spectrometry. The results show that this method can be used for the determination of Cu in natural water.