DETERMINATION OF TERBIUM WITH SOLID-SURFACE ROOM-TEMPERATURE LUMINESCENCE OPTOSENSING

Transient immobilization of the complex formed by acetylacetone with T b(III) on the chelating resin of Chelex 100 packed in a flow cell can induce a room temperature luminescence behaviour in aqueous solutions. Based on this phenomenon, a new room temperature luminescence optosen sing method in aqueous flow system was established to determine terbiu m in the range of 4.0 x 10(-8)-4.0 x 10(-5) M by using a response time of 30 s. Each measurement takes 1 min. The response mechanism of the optosensor was also studied. The present optosensor was easy to prepar e and the lifetime of the optosensor was at least 1 month. The optosen sor has been applied to the determination of terbium ion in the synthe tic samples.