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研究了聚乙烯吡咯烷酮(PVP)对桑色素(morin)和铅Pb(Ⅱ)配合反应的增敏作用.发现pH在3.43时,Pb2+-morin-PVP三元体系在435.8nm激发下,444nm处有强荧光发射.在考察实验最佳条件的基础上,提出了一个荧光光度法测定痕量Pb(Ⅱ)的新方法,其线性范围为0~240ng/mLPb(Ⅱ),对空白11次测定RSD%为3.5%,最低检出限为2.1×10-8g/mLPb(Ⅱ).
The sensitization of polyvinylpyrrolidone (PVP) to the complexation of morin and Pb (Ⅱ) was studied. It was found that at pH 3.43, the Pb2 + -morin-PVP ternary system has strong fluorescence emission at 444 nm under the excitation of 435.8 nm. A new method for the determination of trace Pb (Ⅱ) by fluorescence spectrophotometry was proposed. The linear range was 0 ~ 240ng / mL Pb (Ⅱ), and the RSD% was 11 for blank determination. 5%, the lowest detection limit of 2.1 × 10-8g / mLPb (Ⅱ).