【摘要】 基于硝酸(0.10mol/L)介质中,四溴合汞络阴离子([HgBr4]2–)与Rhod S+(罗丹明S阳离子)作用所形成的[(Rhod S)2]2+.[HgBr4]2–离子缔合物比Rhod S+.Br–在聚酰胺素膜(PAM)固体基质上所占有的Rhod S分子数增加和内重原子微扰效应,从而导致体系的室温燐光(RTP)信号剧烈增强的特性,由此建立了[(Rhod S)2]2+.[HgBr4]2–缔合物固体基质室温燐光法(SSRTP)测定痕量汞的新方法.该方法的线性范围为:0.10～16.0 fgspot–1(对应浓度0.60～40.0 pg mL–1,点样体积0.40μL),工作曲线的回归方程为△Ip=3.955+23.86mHg2+(fgspot–1),n=6,相关系数r=0.9997,检出限为5.0 agspot–1(对应浓度1.25×10–15 gmL–1).本方法成功用于人发、香烟和水样品中痕量Hg2+的测定.同时讨论了离子缔合物SSRTP测定痕量汞机理.更多还原

【Abstract】 A new solid substrate-room temperature phosphorimetry(SSRTP) for the determination of trace mercury has been established.It is based on the fact that in the acidic medium of HNO3,an ionic associate[(Rhod.S)2] 2+.[HgBr4]2-will be formed by [HgBr4]2-and Rhod.S(Rhod.S+).The number of Rhod.S molecules in [(Rhod.S)2] 2+.[HgI4]2-is more than that in Rhod.S+.Br–,and the Hg2+ in [(Rhod.S)2] 2+.[HgBr4]2-will induce heavy atom perturbation effect.Both aspects can cause the sharp increase of phosphorescent intensity on solid substrate.The linear range of this method is 0.10～16.0 fgspot–1(corresponding concentration: 0.60～40.0 pg mL–1,sample volume: 0.40 μl spot–1) with a limit of detection of 5.0 agspot–1(corresponding concentration: 1.25×10–15 gmL–1).The regression equation for working curve is △Ip = 3.955 +23.86mHg2+(fgspot–1),r=0.9997,n=6.This method has been successfully applied to the determination of trace Hg2+ in human hair,cigarette and water.The reaction mechanism for the formation of bromine associate is also discussed.更多还原