| Autor: |
Jiaming L; Department of Chemistry, Zhangzhou Normal College, Zhangzhou 363000, PR China. zzsliujiaming@163.com, Wenqi L, Xuelin L, Hailing C, Qiaomei L, Longdi L, Zhimin L, Guohui Z, Cuilian C |
| Jazyk: |
angličtina |
| Zdroj: |
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2005 Oct; Vol. 61 (13-14), pp. 3077-81. Date of Electronic Publication: 2005 Jan 26. |
| DOI: |
10.1016/j.saa.2004.11.033 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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