Shi Huan, Zhao Nan-jing, Wang Chun-long, Lu Cui-ping, Liu Li-tuo, Chen Dong, Ma Ming-jun, Zhang Yu-jun, Liu Jian-guo, Liu Wen-qing
Key Laboratory of Environment Optics & Technology, Institute of Anhui Optics Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Jan;32(1):25-8.
The spectroscopy emission characteristics and the detection limit of trace heavy metal nickel in water was studied based on laser induced breakdown spectroscopy technique, with a 1,064 nm wavelength Nd : YAG laser as excitation source, and the echelle spectrometer and ICCD detector were used for spectral separation and high sensitive detection with high resolution and wide spectral range. A round flat solid state graphite as matrix was used for element enrichment for reducing water splashing, extending the plasma lifetime and improving the detection sensitivity, and the experimental sample was prepared by titrating a fixed volume of nickel nitrate solution of different concentrations on a fixed area of the graphite matrix. The results show that the better detection delay time is about 700 ns, the spectrum intensity raises with the concentration increase, a good linear relationship is presented at low concentration with a correlation coefficient 0.996 1, and the lower limit of detection of nickel in water with 0.28 mg x L(-1) was retrieved. A measurement method for further study of trace heavy metals in water is provided with laser induced breakdown spectroscopy technique.
基于激光诱导击穿光谱技术，以波长1064nm的Nd:YAG激光器作为激发源，采用中阶梯光栅光谱仪和ICCD探测器进行光谱分离和高灵敏探测，研究了水中痕量重金属镍的光谱发射特性及检测限。使用圆形扁平固态石墨作为基质进行元素富集，以减少水溅，延长等离子体寿命并提高检测灵敏度，通过将固定体积的不同浓度硝酸镍溶液滴定到固定面积的石墨基质上来制备实验样品。结果表明，较好的检测延迟时间约为700ns，光谱强度随浓度增加而升高，在低浓度下呈现良好的线性关系，相关系数为0.996 1，获得了水中镍的检测下限为0.28mg·L⁻¹。激光诱导击穿光谱技术为进一步研究水中痕量重金属提供了一种测量方法。
