【摘要】 合成了新型荧光试剂 3 对氟苯基 5 (2′ 胂酸基苯偶氮 )绕丹宁 ,并并经元素分析、IR确证了其结构。研究了其荧光性质 ,发现在 pH 5 4时试剂与痕量铋 (Ⅲ )形成的螯合物可使试剂的荧光强度大大减弱 ,在λex/λem =30 5 / 4 0 7nm处有最大峰 ,其荧光猝灭值与铋的浓度在 0～ 0 0 2 5 μg·mL-1范围内呈线性关系 ,检出限达 1 2× 10 -10 g·mL-1。建立了一种荧光光度法测定痕量铋的新方法更多还原

【Abstract】 A new fluorescence reagent, 3-(4′-fluorophenyl)-5-(2′-arsenoxylphenylazo)-rhodanine, was synthesized. The structure of the reagent was clarified by elemental analysis and IR. At pH 5.4, the reagent can react with trace bismuth (Ⅲ) to form a chelate which reduces the fluorescence intensity greatly. And when λ ex/λ em=305/407 nm, the fluorescence is intensive. There is a linear relationship between the decrease of fluorescence intensity and the concentration of bismuth (Ⅲ) in the range of 0-0.025 μg·mL -1. The detection limit is 1.2×10 -10 g·mL -1. A new method of fluorescence spectrophotometric determination of bismuth (Ⅲ) was developed.更多还原