Determination of terbium with solid surface room temperature luminescence optosensing

Transient immobilization of the complex formed by acetylacetone with Tb(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 optosensing method in aqueous flow system was established to determine terbium in the range of 4.0 × 10−8 − 4.0 × 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 prepare and the lifetime of the optosensor was at least 1 month. The optosensor has been applied to the determination of terbium ion in the synthetic samples.