UV light-emitting-diode photochemical mercury vapor generation for atomic fluorescence spectrometry |
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Authors: | Hou Xiaoling Ai Xi Jiang Xiaoming Deng Pengchi Zheng Chengbin Lv Yi |
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Institution: | College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China. |
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Abstract: | A new, miniaturized and low power consumption photochemical vapor generation (PVG) technique utilizing an ultraviolet light-emitting diode (UV-LED) lamp is described, and further validated via the determination of trace mercury. In the presence of formic acid, the mercury cold vapor is favourably generated from Hg(2+) solutions by UV-LED irradiation, and then rapidly transported to an atomic fluorescence spectrometer for detection. Optimum conditions for PVG and interferences from concomitant elements were investigated in detail. Under optimum conditions, a limit of detection (LOD) of 0.01 μg L(-1) was obtained, and the precision was better than 3.2% (n = 11, RSD) at 1 μg L(-1) Hg(2+). No obvious interferences from any common ions were evident. The methodology was successfully applied to the determination of mercury in National Research Council Canada DORM-3 fish muscle tissue and several water samples. |
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