研究四磺酸基酞菁锌(ZnTsPc)在溶液中的荧光性质,发现ZnTsPc位于690nm(λex=390nm)的发射峰强度在pH=12.0、c(CTAB)为7.46×10^-4mol·L^-1时达最大值.讨论了pH和表面活性剂对四磺酸基酞菁锌存在形式的影响,指出四磺酸基酞菁锌的解聚是使发射峰强度增大的主要原因.加入甲巯咪唑(thiamazole)可使荧光发生猝灭,优化了荧光猝灭法测定甲巯咪唑的最佳条件:pH—11.2,c(CTAB)=7.64×10^-4mol·L^-1,c(ZnTsPc)=2.0×10^-5mol·L^-1在优化的测定条件下,在0.2~1.0μmol·L^-1范围,c(甲巯咪唑)(单位:μmol·L^-1)与△F(F0—F)的关系为△F=61400c(甲巯咪唑)+50100,检测限为0.16/μmol·L^-1.利用该法测定样品中甲巯咪唑的含量,结果令人满意.
Fluorescence properties of zinc tetra-sulphophthalocyanine (ZnTsPc) are studied. It is found that the strongest emission intensity at 690 nm (λEx = 390 nm) is obtained at pH 12.0 and in the presence of CTAB (7. 46 × 10^-4 mol · L^-1). It is the surfactant and high pH that makes ZnTsPc disaggregate into monomer which increases the emission intensity. The fluorescence can be quenched by thiamazole (RSH). Based on the quenching reaction, a method for determination of RSH is proposed and the optimum conditions are pH = 11.2, c (CTAB) = 7.64 × 10^-4 mol · L^-1, c (ZnTsPc) = 2.0 × 10^-5 mol · L^-1. In the concentration range befween 2× 10^-7 and 1 × 10^-6 mol · L^-1, △F(F0-F) is linear with c(RSH) and the detection limit is 0. 16 μmol · L^-1.