在pH 4.0的缓冲体系中,铊与桑色素具有较灵敏的荧光反应,在λex=426 nm,λem=489 nm处,铊(Ⅰ)的质量浓度在0.25~3.0 μg/25 mL范围内与ΔF呈线性关系,其相对标准偏差为2.95%.对合成水样的测定,其回收率为96.1%~102.2%之间.采用活性炭吸附分离消除其它共有离子的干扰.

In an acetate buffer medium of pH 4.0,a sensitive fluorescence reaction was observed between Tl(Ⅲ) and morin,having its excitation and emission wavelengths at 426 nm and 489 nm respectively.Linear relationship was found between the intensity of enhancement of fluorescence (ΔF) and the concentration of Tl(Ⅲ) in the range 0.25-3.0 μg in 25 mL of solution.Precision of the method was tested at the concentration level of 2 μg of Tl(Ⅲ) per 25 mL of solution,and the value of RSD′s (n=7) obtained was 2.95%.Several simulated water samples were analyzed by the proposed method,values of recovery found were in the range 96.1%-102.2%.Separation of Tl(Ⅲ) from co-existing ions by the active carbon adsorption was adopted in the analysis.