Enhancing the detectability of Ag, Cd, Hg, In, Pb, Tl, and Zn in water by solution anode glow discharge coupled with argon jet cathode and external magnetic field
Jie Yu , Kai Wang , Xuehe Li , Yongjie Zhou , Chuang Zhang , Xiaoyun Fang , Chenxu Liang , Quanfang Lu
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引用次数: 0
Abstract
An atomic emission spectrometry based on solution anode glow discharge coupled with argon jet cathode and magnetic field (SAGD-AJC-MF) was constructed for the detection of trace Ag, Cd, Hg, In, Pb, Tl, and Zn in water samples, where a plasma was produced between a platinum spiral-wrapped ceramic capillary anode and an argon jet titanium (Ti) nozzle cathode, and an external magnetic field was used to enhance excitation efficiency by altering electron trajectories and increasing the collision frequency between electrons and neutral atoms. The results found that the optimal operating parameters are pH = 1.6 HNO3 as supporting electrolyte, 3.4 mL min−1 solution flow rate, 300 mL min−1 Ar flow rate, and 2.0 mm discharge gap. A 0.55 T external magnetic field reduces the red-hot degree of the cathode Ti nozzle, widen the application range of voltage and reduce the interference. The emission intensities, sensitivities and limit of detection (LOD) were improved by 2.0–3.3, 2.6–4.7 and 2.8–5.2 times, respectively. The SAGD-AJC-MF are employed for the analysis of water samples by standard addition method, the measured results are basically consistent with those obtained by ICP-AES, and the recoveries in spiked Yellow River and wastewater samples are ranged from 89.2 % to 107.8 %, confirming the feasibility, accuracy and reliability. In short, the SAGD-AJC-MF has outstanding performance in water quality monitoring and environmental warning due to a compact, portable and low-cost analytical instrument.
期刊介绍:
Talanta provides a forum for the publication of original research papers, short communications, and critical reviews in all branches of pure and applied analytical chemistry. Papers are evaluated based on established guidelines, including the fundamental nature of the study, scientific novelty, substantial improvement or advantage over existing technology or methods, and demonstrated analytical applicability. Original research papers on fundamental studies, and on novel sensor and instrumentation developments, are encouraged. Novel or improved applications in areas such as clinical and biological chemistry, environmental analysis, geochemistry, materials science and engineering, and analytical platforms for omics development are welcome.
Analytical performance of methods should be determined, including interference and matrix effects, and methods should be validated by comparison with a standard method, or analysis of a certified reference material. Simple spiking recoveries may not be sufficient. The developed method should especially comprise information on selectivity, sensitivity, detection limits, accuracy, and reliability. However, applying official validation or robustness studies to a routine method or technique does not necessarily constitute novelty. Proper statistical treatment of the data should be provided. Relevant literature should be cited, including related publications by the authors, and authors should discuss how their proposed methodology compares with previously reported methods.