State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China.
Appl Spectrosc. 2019 Apr;73(4):380-386. doi: 10.1177/0003702819829509.
We demonstrated a unique method for the detection of heavy metals, such as Ni, Cr, and Cd, at trace level in aqueous solutions by laser induced breakdown spectroscopy (LIBS) enriched by aluminum oxide (AlO) nanoparticles (NP) adsorption. AlO NPs were used for the sample phase transformation and heavy metals pre-concentration because of its excellent adsorption capacity and sparse spectral lines. The influence of laser wavelength and laser irradiance on the signal intensity was investigated. With 45 mL solutions used for enrichment and adsorption, limits of detection obtained for Ni, Cr, and Cd were 9.61, 8.49, and 71.6 μg/L under 532 nm laser ablation, and 22.5, 20.4, and 83.8 μg/L under 1064 nm laser ablation, respectively. The relative standard deviations of all elements were about 12% or 13%. Moreover, AlO NPs adsorption enrichment of target elements was verified and the detection sensitivity was improved by increasing the amount of sample solutions.
我们展示了一种独特的方法，通过激光诱导击穿光谱（LIBS）富集氧化铝（AlO）纳米粒子（NP）吸附，在痕量水平上检测水溶液中的重金属，如 Ni、Cr 和 Cd。AlO NPs 因其优异的吸附能力和稀疏的谱线而被用于样品相转化和重金属预浓缩。研究了激光波长和激光辐照度对信号强度的影响。使用 45 毫升用于富集和吸附的溶液，在 532nm 激光烧蚀下，Ni、Cr 和 Cd 的检出限分别为 9.61、8.49 和 71.6μg/L，在 1064nm 激光烧蚀下，检出限分别为 22.5、20.4 和 83.8μg/L。所有元素的相对标准偏差均约为 12%或 13%。此外，通过增加样品溶液的量，验证了 AlO NPs 对目标元素的吸附富集，并提高了检测灵敏度。
