光谱学与光谱分析 |
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A Hydride Generation-Catalytic Resonance Rayleigh Scattering Method for Detection of Trace Arsenic |
LIANG Ai-hui, YANG Duo, WEN Gui-qing, LIU Qing-ye, JIANG Zhi-liang* |
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection of Ministry Education, Guangxi Normal University, Guilin 541004, China |
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Abstract Arsenic is a toxic metal element and the establishment of a highly sensitive and selective method for As has great significance to human health and environment protection. In sulfuric acid medium, As(Ⅲ) was reduced by NaBH4 to form AsH3 gas that was trapped by the Ce(Ⅳ)-I- catalytic absorption solution to cause Ce(Ⅳ) concentration decreased and As particle increased, which resulted in the resonance Rayleigh scattering (RRS) and fluorescence increased at 370 and 351 nm respectively. The increased RRS and fluorescence intensities were linear to As(Ⅲ) concentration in the range of 0.006~0.76 and 0.006~0.28 mg·L-1 respectively, with a detection of As of 3.0 μg·L-1 . The new hydride generation-catalytic RRS method was applied for detection of trace As(Ⅲ) in milk samples, and the results were in agreement with that of hydride generation-atomic absorption spectrometry.
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Received: 2015-10-28
Accepted: 2016-03-01
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Corresponding Authors:
JIANG Zhi-liang
E-mail: zljiang@mailbox.gxnu.edu.cn
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