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《Journal of Guangxi Normal University(Natural Science Edition)》 2017-03
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Hydride Generation-Rhodamine 6G Fluorescence Method for the Determination of Trace Arsenic

LI Chongning;YANG Duo;PAN Hongcheng;WEN Guiqing;LIANG Aihui;JIANG Zhiliang;College of Chemistry and Bioengineering,Guilin University of Technology;College of Environment and Resource,Guangxi Normal University;  
This paper introduces a new fluorescence method for the detection of trace arsenic in the Rh6G-I_3 system.In sulfuric acid medium,arsenic is reduced by NaBH4 to form AsH_3 which can reduce I-3into I-.With I-3 conjugating with rhodamine 6G(Rh6G)to form Rh6G-I_3 associated particles,the fluorescence intensity of Rh6 Gbecomes weak at 562 nm.As I-3ion is reduced by AsH_3 resulting in the concentration increase of free Rh6 G,its fluorescence intensity increases.Under the selected conditions,the increasing values(ΔF562)of the fluorescence intensity at 562 nm is linear in the range of 0.011~0.997mg/L As,with the regression equation ofΔF =825.1c-26.8 and a detection limit of 6.28μg/L.Thus,a new fluorescence method for the detection of As was set up.
【Fund】: 国家自然科学基金(21367005 21465006 21477025 21667006);; 广西自然科学基金(2013GXNSFFA019003)
【CateGory Index】: O657.3;X830
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