光谱探针在测定食品中痕量铅的应用  

Application of Spectral Probe on Determination of Trace Lead in Food

作　　者：郭明鑫 张召凤 李考学 郭蒙 

机构地区：[1]山东省昌乐二中,山东昌乐262400 [2]潍坊学院化学化工与环境工程学院,山东潍坊261061

出　　处：《化学试剂》2018年第3期274-276,共3页Chemical Reagents

基　　金：山东省自然科学基金资助项目(ZR2014BL016);潍坊学院博士科研基金资助项目(2017BS08)

摘　　要：建立了一种以芹菜素为光谱探针测定食品中铅的方法。在pH8．10、9．0×10^-3mol／L三（羟甲基）氨基甲烷一HCl缓冲溶液、2．99×10^-5mol／L芹菜素溶液中，Pb^2＋浓度在2．4×10^-7-4．8×10^-6mol／L范围内与吸光度降低值呈良好的线性关系，线性方程为AA=1．8×10^-2c＋9．76×10^-3（c／x10^-6mol／L）（R^2=0．994），检出限达2．3×10^-7mol／L，并将该法成功应用于黑乌龙茶中铅的测定。经研究发现，铅与芹菜素形成配合比为1：2的配合物。Using apigenin as a spectral probe, a method for the determination of lead in food was established.In the range of 2.4×10^-7- 4.8× 10^-6 mol/L, there was a good linear relationship between the reduction of absorbance with the concentration of lead ions under the pH 8. 10,9.0×10^-3 mol/L Tris-HC1 buffer solution, 2.99×10^-5 mol/L apigenin solution.The linear equation was AA = 1.8x 10-2c＋9. 76x 10-3（c/x 10^-6 tool/L）（ R2= 0. 994）.The detection limit of this method was 2. 3×10^-7 mol/L.And the lead in black oolong tea was successfully determined.In addition ,the results showed that the complexation ratio of lead with apigenin was 1：2.

关 键 词：芹菜素 铅 紫外光谱法 配合比 

分 类 号：O657.3[理学—分析化学]