重原子存在下β-环糊精诱导西维因室温磷光

Room Temperature Phosphorescence of Carbaryl Induced by β-Cyclodextrin in the Presence of Heavy Atom Perturbation

以 1,2 -二溴丙烷 (DBP)为重原子微扰剂 ,建立了痕量西维因 (CBL)的 β-环糊精 (β- CD)诱导室温磷光(RTP)分析法。CBL、β- CD和 DBP形成三元包络物和 DBP的微扰作用 ,CBL有强而稳定的 RTP信号。研究了温度、p H值以及形成包络物的 3种组分物质的浓度的变化对体系 RTP的影响。在优化实验条件下 ,RTP强度与 CBL的浓度在 4 .0— 2 0 .0 μg· dm-3范围内呈良好线性关系 ,检出限 1.2 μg· dm-3 ,相对标准偏差为 1.6 1% (n=7)。方法用于合成样品中的 CBL测定时 ,结果满意。

A analysis method for determination of trace carbaryl (CBL) was established based on the room temperature phosphorescence (RTP) induced by β-cyclodextrin(β-CD) in the presence of heavy atom perturbation of 1,2-dibromopropane (DBP).A strong and stable RTP signal can be observed due to the formation of β-CD/CBL/DBP inclosing complex and the influence of the heavy-atom perturbation.The effects of temperature, pH and the variation of concentrations of each component on RTP were also investigated.Under the optimal conditions,a liner range of 4.0—20.0μg·dm -3 was obtained with a detection limit of 1.2μg·dm -3 and relative standard deviation(n=7) of 1.61%.The method was applied to the determination of synthetic samples with a satisfactory result.