Yao Mingyin, Lin Jinlong, Liu Muhua, Xu Yuan
Optics-Electrics Application of Biomaterials Lab, Jiangxi Agricultural University, Nanchang, Jiangxi, China.
Appl Opt. 2012 Apr 1;51(10):1552-7. doi: 10.1364/AO.51.001552.
A laser induced breakdown spectroscopy (LIBS) system was developed for determination of toxic metals Cr in wastewater collected from a refuse incineration power plant near Poyang Lake. The plasma was generated by focusing a pulsed Nd:YAG laser at 1064 nm on the surface of liquid. Experimental conditions were optimized for improving the sensitivity and repeatability of the LIBS system through a parametric dependence study in potassium bichromate (K(2)Cr(2)O(7)) aqueous solutions. Calibration curves for Cr I 425.43 and 357.87 nm lines are compared and the limit of detection is found to be 39 and 86 ppm, respectively. This calibration curve of Cr I 425.43 nm has been used for quantification of Cr in wastewater collected from a refuse incineration power plant near Poyang Lake where the concentration of Cr is found to be 97 ppm. The results between LIBS and standard analytical technique such as atomic absorption spectroscopy were compared, and the relative standard deviation was 8.5%.
开发了一种激光诱导击穿光谱（LIBS）系统，用于测定从鄱阳湖附近的垃圾焚烧发电厂采集的废水中的有毒金属铬。通过将波长为1064 nm的脉冲Nd:YAG激光聚焦在液体表面来产生等离子体。通过在重铬酸钾（K₂Cr₂O₇）水溶液中进行参数依赖性研究，优化了实验条件，以提高LIBS系统的灵敏度和重复性。比较了Cr I 425.43和357.87 nm谱线的校准曲线，发现检测限分别为39 ppm和86 ppm。Cr I 425.43 nm的该校准曲线已用于定量鄱阳湖附近垃圾焚烧发电厂采集的废水中的铬，发现其中铬的浓度为97 ppm。比较了LIBS与标准分析技术（如原子吸收光谱法）的结果，相对标准偏差为8.5%。
