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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).