光谱学与光谱分析, 2014, 34 (7): 1954, 网络出版: 2014-07-22  

共线DP-LIBS定量分析水中Cu含量的试验研究

Quantitative Analysis of Cu in Water by Collinear DP-LIBS
作者单位
江西农业大学生物光电及应用重点实验室, 江西 南昌 330045
摘要
为研究双脉冲激光诱导击穿光谱(DP-LIBS)对水体中铜(Cu)元素检测灵敏度的影响, 采用共线双脉冲LIBS检测装置对所配置的含Cu水溶液进行激光诱导击穿光谱试验。 结果显示: 与运用单脉冲激光诱导击穿光谱(SP-LIBS)检测水体中Cu元素相比, 运用DP-LIBS探测到的光谱明显增强, 并且其检测结果受光谱仪采集的延迟时间、 两脉冲之间的脉冲延迟时间、 双脉冲激光能量等因素的影响显著。 确定最佳的试验条件为: 光谱采集延迟时间为1 380 ns, 脉冲延迟时间为25 ns, 双脉冲激光能量为100 mJ。 分别对铜元素324.7和327.4 nm的特征谱线进行定量分析, 两谱线的检测限分别是3.5和4.84 μg·mL-1, 且相对标准偏差都在10%以内。 用500 μg·mL-1样品对特征谱线为324.7 nm所建立的定标曲线进行验证, 反演得出该样品的浓度为446 μg·mL-1, 相对误差为10.8%。 研究表明DP-LIBS能够提高Cu元素的检测灵敏度, 同时具有较高的稳定性。
Abstract
The purpose of this research is to study the influence of double pulse laser induced breakdown spectroscopy (DP-LIBS) on the sensitivity of Cu in water. The water solution of Cu was tested by collinear DP-LIBS in this article. The results show that spectral intensity of Cu can be enhanced obviously by DP-LIBS, compared with single pulse laser induced breakdown spectroscopy (SP-LIBS). Besides, the experimental results were significantly impacted by delay time between laser pulse and spectrometer acquisition, delay time of double laser pulse and energy of laser pulse and so on. The paper determined the best conditions for DP-LIBS detecting Cu in water. The optimal acquisition delay time was 1 380 ns. The best laser pulse delay time was 25 ns. The most appropriate energy of double laser pulse was 100 mJ. Characteristic analysis of spectra of Cu at 324.7 and 327.4 nm was done for quantitative analysis. The detection limit was 3.5 μg·mL-1 at 324.7 nm, and the detection limit was 4.84 μg·mL-1 at 327.4 nm. The relative standard deviation of the two characteristic spectral lines was within 10%. The calibration curve of characteristic spectral line, established by 327.4 nm, was verified with 500 μg·mL-1 sample. Concentration of the sample was 446 μg·mL-1 calculated by the calibration curve. This research shows that the detection sensitivity of Cu in water can be improved by DP-LIBS. At the same time, it had high stability.

郑美兰, 姚明印, 陈添兵, 林永增, 黎文兵, 刘木华. 共线DP-LIBS定量分析水中Cu含量的试验研究[J]. 光谱学与光谱分析, 2014, 34(7): 1954. ZHENG Mei-lan, YAO Ming-yin, CHEN Tian-bing, LIN Yong-zeng, LI Wen-bing, LIU Mu-hua. Quantitative Analysis of Cu in Water by Collinear DP-LIBS[J]. Spectroscopy and Spectral Analysis, 2014, 34(7): 1954.

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