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 380ns,脉冲延迟时间为25ns,双脉冲激光能量为100mJ。分别对铜元素324.7和327.4nm的特征谱线进行定量分析,两谱线的检测限分别是3.5和4.84μg·mL-1,且相对标准偏差都在10%以内。用500μg·mL-1样品对特征谱线为324.7nm所建立的定标曲线进行验证,反演得出该样品的浓度为446μg·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。
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 446μg · 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 .
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2014年第7期1954-1958,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(31271612)
江西省教育厅科技计划项目(GJJ12249)
江西省学术带头人计划项目(09004004)资助
关键词
双脉冲激光诱导击穿光谱
水溶液
灵敏度
铜元素
Double pulse laser induced breakdown spectroscopy
Water solution
Sensitivity of detection
Cu
