中文摘要：

本文建立了以Rh6G-I-3体系荧光光谱法测量痕量As的方法。在硫酸介质中,以硼氢化钠（NaBH4）为还原剂,可将As还原为砷化氢（AsH3）气体,该气体可还原I-3。当I-3与罗丹明6G（Rh6G）形成缔合物微粒时,体系在562nm处的荧光信号较弱,随着I-3被AsH3被还原,体系中游离的Rh6G浓度增大,在562nm处的荧光信号增强。在选定条件下,As浓度在0.011~0.997mg/L与体系荧光增强值ΔF562呈线性关系,线性回归方程为ΔF562=825.1c-26.8,检出限为6.28μg/L。据此建立一个检测As的荧光光谱法。

英文摘要：

This paper introduces a new fluorescence method for the detection of trace arsenic in the Rh6G-I3 system.In sulfuric acid medium,arsenic is reduced by NaBH4 to form AsH3 which can reduce I-3into I-.With I-3 conjugating with rhodamine 6G（Rh6G）to form Rh6G-I3 associated particles,the fluorescence intensity of Rh6 Gbecomes weak at 562 nm.As I-3ion is reduced by AsH3 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.