Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10560080 | Talanta | 2005 | 4 Pages |
Abstract
Luminescent particles of lead carboxymethyl cellulose (Pb(CMC)2), which contains salicyl fluorones (THBF), Pb(CMC)2-THBF, were synthesized by sol-gel method. Pb(CMC)2-THBF can emit intense and stable solid substrate room temperature phosphorescence (SS-RTP) on filter paper. EDTA can chelate the Pb2+ in Pb(CMC)2-THBF, causing it decompose into aqueous soluble components PbY2â, CMCâ and THBF, and these components can react with Hg2+ to form (CMC)2Hg-THBF, causing decrease of phosphorescence intensity. Based on the facts above, a new method for the determination of trace mercury by SS-RTP quenching method was established. The linear range of this method is 2.0-40.0 fg spotâ1 (5.0-100.0 pg mlâ1) of Hg2+, with a detection limit (LD) of 0.26 fg spotâ1, and the regression equation of working curve is ÎIp=13.02+1.165mHg2+ (fg spotâ1, 0.4 μl spotâ1), r = 0.9994. This method has been applied to the determination of trace mercury in water sample with satisfactory results. The mechanism of SS-RTP emission is also discussed.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Jia-Ming Liu, Ai-Hong Wu, Huan-Huan Xu, Qing-Hua Wang, Long-Di Li, Guo-Hui Zhu,