摘要
研究了Tb3 + Gd3 + 2 ,3 吡啶二羧酸体系的荧光特性。结果表明 ,钆对该体系中Tb3 +的特征荧光有显著增敏作用 ,当钆浓度为 4 .0× 10 - 4mol·L- 1,pH为 8.0 ,2 ,3 吡啶二羧酸浓度为3.5× 10 - 4mol·L- 1时 ,体系荧光强度最大。该体系用于稀土样品中痕量Tb3 + 的测定 ,铽浓度在 1× 10 - 9～ 2× 10 - 7mol·L- 1范围内与荧光强度呈线性关系 ,检出限为 5× 10 - 10 mol·L- 1。
It was found that the fluorescence given by the reaction system of Tb(Ⅲ)-pyridine-2,3-dicarboxylic acid (PDA) in an ammoniacal buffer solution of pH 8.0 was evidently enhanced by the presence of Gd(Ⅲ) ion. Under conditions given below, the fluorescence of the reaction attained to its maximum intensity: =4.0×10 -4mol·L -1, =3.5×10 -4mol·L -1, acidity of the reaction solution: pH=8.0. Based on this reaction, a sensitive method for the determination of Tb(Ⅲ) in rare earth samples was proposed, having a linearity in the concentration range of 1×10 -9～2×10 -7mol·L -1 of Tb 3+ and a detection limit of 5×10 -10mol·L -1.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2002年第10期513-514,516,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
