title: Determination of trace silver by solid substrate room temperature phosphorescence quenching method based on lead carboxymethyl cellulose particles (Pb(CMC)2) containing luminescent salicyl fluorenes molecules.
abstract: Luminescent particles of lead carboxymethyl cellulose (Pb(CMC)2) containing salicyl fluorones (THBF), Pb(CMC)2-THBF were synthesized by the sol-gel method, using sodium carboxymethyl cellulose (NaCMC) as precursor and Pb2+ as precipitant. Pb(CMC)2-THBF can emit the intense and stable solid substrate room temperature phosphorescence (SS-RTP) on filter paper. And EDTA can chelate Pb2+ in Pb(CMC)2-THBF, causing it to decompose into aqueous soluble components PbY2-, CMC- and THBF, which can react with Ag+ to form Ag(CMC)2-THBF, causing the decrease of phosphorescence intensity. Based on the facts above, a new method for the determination of trace silver by SS-RTP quenching method was established. The linear range of this method is 8.0-40.0 fg spot(-1) (20.0-100.0 pg ml(-1)), with a detection limit (LD) of 2.2 fg spot(-1) (corresponding to a concentration range of 5.5 x 10(-13) g ml(-1)), and the regression equation of working curve is DeltaI(p) = 12.56 + 0.5527C(Ag+) (fg spot(-1), 0.4 microl spot(-1)), n = 8, r = 0.9992. This method has been applied to the determination of trace silver in human hair and tea sample with satisfactory results. The mechanism of SS-RTP emission is also discussed.
authors.affiliation: Department of Chemistry, Zhangzhou Normal College, Zhangzhou 363000, PR China. zzsliujiaming@163.com
authors.forename: Liu
authors.initials: L
authors.lastname: Jiaming
authors.forename: Li
authors.initials: L
authors.lastname: Wenqi
authors.forename: Li
authors.initials: L
authors.lastname: Xuelin
authors.forename: Chen
authors.initials: C
authors.lastname: Hailing
authors.forename: Lu
authors.initials: L
authors.lastname: Qiaomei
authors.forename: Li
authors.initials: L
authors.lastname: Longdi
authors.forename: Li
authors.initials: L
authors.lastname: Zhimin
authors.forename: Zhu
authors.initials: Z
authors.lastname: Guohui
authors.forename: Chen
authors.initials: C
authors.lastname: Cuilian
mesh_terms: D002266:Carboxymethylcellulose Sodium / Q000031:analogs & derivatives* / Q000737:chemistry*; D005449:Fluorenes / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D009942:Organometallic Compounds / Q000737:chemistry*; D012834:Silver / Q000032:analysis* / Q000737:chemistry*; D013057:Spectrum Analysis; D013696:Temperature; D013997:Time Factors
chemical_list: D005449:Fluorenes; D009942:Organometallic Compounds; C506568:lead carboxymethyl cellulose; D012834:Silver; D002266:Carboxymethylcellulose Sodium