A simple luminescence method for uranyl estimation in water via co-precipitation with 3,5-pyridinedicarboxylic acid-Cd2+ complex
摘要
A simple method has been developed for the sensitive detection of uranyl ion (UO22+) in water using time gated luminescence with pulsed lamp as excitation source. UO22+ ions show remarkable luminescence when it is present with Cd2+− 3,5-pyridinedicarboxylic acid complex which is water insoluble. Luminescence of UO22+ ions is further resolved with enhanced lifetime when the complex is prepared in a mixture of acetonitrile and water. The luminescence intensity shows a linear response with concentration over 0.5–25 ng mL−1 of UO22+ ions. Detection limit of 0.15 ng mL−1 (6.3 × 10–10 M) is achieved with a relative standard deviation (RSD) 9% (n = 6). The present method has been successfully applied for sensing of UO22+ ions in normal water as well as in sea water without pre-concentration. This study demonstrates a very quick and sensitive method for the detection of UO22+ ions in aqueous environment.