State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China; Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
Talanta. 2023 May 15;257:124339. doi: 10.1016/j.talanta.2023.124339. Epub 2023 Feb 10.
In this study, a novel sensitive method for As determination by atomic fluorescence spectrometry was developed based on UV-assisted liquid spray dielectric barrier discharge (UV-LSDBD) plasma-induced vapor generation. It was found that prior-UV irradiation greatly facilitates As vapor generation in LSDBD likely because of the increased generation of active substances and the formation of As intermediates with UV irradiation. The experimental conditions affecting the UV and LSDBD processes (such as formic acid concentration, irradiation time, the flow rates of sample, argon and hydrogen) were optimized in detail. Under the optimum conditions, As signal measured by LSDBD can be enhanced by about 16 times with UV irradiation. Furthermore, UV-LSDBD also offers much better tolerance to coexisting ions. The limit of detection was calculated to be 0.13 μg L for As, and the relative standard deviation of the repeated measurements was 3.2% (n = 7). The accuracy and effectiveness of this new method were further verified by the analysis of simulated natural water reference sample and real water samples. In this work, UV irradiation was utilized for the first time as an enhancement strategy for PIVG, which opens a new approach for developing green and efficient vapor generation methods.
在本研究中，我们开发了一种基于紫外辅助液滴喷射介电阻挡放电（UV-LSDBD）等离子体诱导蒸气发生（PIVG）的原子荧光光谱法测定砷的新方法。研究发现，紫外辐照可以极大地促进 LSDBD 中砷的蒸气发生，这可能是因为紫外辐照增加了活性物质的生成，并形成了具有紫外辐照的砷中间体。详细优化了影响 UV 和 LSDBD 过程的实验条件（如甲酸浓度、辐照时间、样品、氩气和氢气的流速）。在最佳条件下，UV 辐照可使 LSDBD 测量的砷信号增强约 16 倍。此外，UV-LSDBD 对共存离子也有更好的耐受性。砷的检出限计算为 0.13μg/L，7 次重复测量的相对标准偏差为 3.2%。通过对模拟天然水参考样品和实际水样的分析，进一步验证了这种新方法的准确性和有效性。在这项工作中，首次将紫外辐照用作 PIVG 的增强策略，为开发绿色、高效的蒸气发生方法开辟了新途径。
