Nie Junfei, Guo Lianbo, Liu Yuanchao, Deng Nan, Hu ZhenLin, Zheng Peichao, Lau Condon
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China; Hunan Provincial Key Laboratory of Girds Operation and Control on Multi-Power Sources Area, Shaoyang University, Shaoyang, Hunan, 422000, China.
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
Talanta. 2024 Jan 15;267:125199. doi: 10.1016/j.talanta.2023.125199. Epub 2023 Sep 14.
Heavy metal detection is imperative for human health and environmental sustainability. However, the commonly used liquid sample pretreatment, drying liquid droplet to solid, encounters solute diffusion and nonuniform distribution, thus causing unpromising detection results. Here, we developed a radial electroosmotic flow-driven (REOF) platform to enrich heavy metals in water for high-sensitive detection using laser-induced breakdown spectroscopy (LIBS). Firstly, the electrodes in the substate for REOF were designed and produced by the printed circuit board manufacturer. Different particle deposition patterns were observed by modifying the direction and magnitude of voltage in the evaporated droplets of Cadmium Chloride (CdCl) on the substrate. Then, the two-dimensional model of the evaporating droplets with REOF was established to verify the experimental phenomenon. The CdCl (10-50 mg/L) and Manganese Chloride (MnCl, 1-8 mg/L) solutions were quantitatively analyzed with the optimized parameter on the substrate by LIBS. The detection limits of Ca and Mn can be reduced by approximately 42 times with REOF substrates by LIBS. Finally, the Mn in the real underground water sample was tested with the REOF substrate by LIBS, and the relative error was 5.5% compared with the results of ICP-MS. The results demonstrated that the REOF can enrich and uniformly distribute the solute on the substrate, and be helpful for the analysis of heavy metals in solution with LIBS.
重金属检测对于人类健康和环境可持续性至关重要。然而，常用的液体样品预处理方法，即将液滴干燥成固体，会遇到溶质扩散和分布不均的问题，从而导致检测结果不理想。在此，我们开发了一种径向电渗流驱动（REOF）平台，用于富集水中的重金属，以便使用激光诱导击穿光谱法（LIBS）进行高灵敏度检测。首先，由印刷电路板制造商设计并制作了用于REOF的底层电极。通过改变氯化镉（CdCl）在基底上蒸发液滴中的电压方向和大小，观察到了不同的颗粒沉积模式。然后，建立了具有REOF的蒸发液滴的二维模型，以验证实验现象。使用LIBS在基底上以优化参数对氯化镉（10 - 50 mg/L）和氯化锰（MnCl，1 - 8 mg/L）溶液进行了定量分析。通过LIBS，使用REOF基底时钙和锰的检测限可降低约42倍。最后，使用LIBS在REOF基底上对实际地下水样品中的锰进行了测试，与电感耦合等离子体质谱法（ICP-MS）的结果相比，相对误差为5.5%。结果表明，REOF可以使溶质在基底上富集并均匀分布，有助于使用LIBS分析溶液中的重金属。
