固体基质室温燐光猝灭法测定痕量的铜

Determination of Trace Copper by Solid Substrate-Room Temperature Phosphorescence Quenching Method B

以羧甲基纤维素钠(carboxymethyl cellulose,NaCMC)为前驱体,掺杂水杨基荧光酮(Salicyl Fluorone,缩写为SAF),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钱微球([(CMC)2Pb-SAF]),此微球在滤纸基质上可发射强而稳定的室温燐光。基于EDTA与Pb2+的络合反应,使[(CMC)2Pb-SAF]微球转化为水溶性组分(PbY2-、CMC-、SAF),该组分与痕量的Cu2+作用生成(CMC)2Cu–SAF,导致[(CMC)2Pb-SAF]的固体基质室温燐光猝灭,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燐猝灭测定痕量铜的新方法?梅椒ㄓ糜谌朔ⅰ?茶叶中痕量铜的测定,结果满意。

Luminescent particles of lead carboxymethyl cellulose （Pb（CMC）2） that contain luminescent salicyl fluorones （SAF） （[Pb（CMC）2]-SAF） were synthesized by Sol-gel method, using sodium carboxymethyl cellulose （NaCMC） as precursor and Pb^2＋ as precipitator. [Pb（CMC）2]-SAF can emit intense and stable solid substrate-room temperature phosphorescence （SS-RTP） on filter paper. EDTA （ethylenediaminetetraacetic acid） can chelate the Pb^2＋ in [Pb（CMC）2]-SAF, causing it to decompose into aqueous soluble components PbY^2-, CMC^- and SAF, and these components can react with Cu^2＋ to form [Cu（CMC）2]-SAF, 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. This method has been applied to the determination of trace copper in human hair and tea samples with satisfactory results.