高灵敏固体基质室温燐光猝灭法测定痕量的银  

Determination of Trace Silver by Solid Substrate Room Temperature Phosphorescence Quenching Method

作　　者：刘佳铭[1] 

机构地区：[1]漳州师范学院化学与环境科学系,福建漳州363000

出　　处：《漳州师范学院学报（自然科学版）》2007年第4期69-72,共4页Journal of ZhangZhou Teachers College（Natural Science)

基　　金：福建省自然科学基金资助项目(C0510028;D0510027)

摘　　要：以CMCNa(羧甲基纤维素钠)为前驱体,掺杂水杨基荧光酮(THBF),Pb2+为沉淀剂,用Sol-gel法合成发光分子水杨基荧光酮羧甲基纤维素铅微球(L-[(CMC)2Pb-THBF]).此微球在滤纸基质上可发射强而稳定的室温光.基于EDTA与Pb2+的络合反应,使L-[(CMC)2Pb-THBF]微球转化为水溶性组分(PbY2-、2CMC-、THBF),该组分与痕量的Ag+作用生成(CMC)2 Ag–THBF,导致S-L-[(CMC)2Pb-THBF]的固体基质室温光猝灭,据此建立了发光分子水杨基荧光酮羧甲基纤维素铅微球固体基质室温光猝灭测定痕量银的新方法.该方法用于人发、茶叶中痕量银的测定,结果满意.固体基质室温光测定银的反应机理.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 Pb^2＋ 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 Pb^2＋ in Pb（CMC）2-THBE causing it decompose into aqueous soluble components PbY^2-, CMC^- and THBE which can react with Ag^＋ to form Ag（CMC）2-THBE 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. 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.

关 键 词：发光分子水杨基荧光酮羧甲基纤维素铅微球 固体基质室温烧猝灭法 银 

分 类 号：O629.8[理学—有机化学]