荧光光度法测定饮料中的铅  

DETERMINATION OF LEAD IN DRINK BY FLUORESCENCE SPECTROPHOTOMETRY

作　　者：刘红梅[1] 赵莹[1] 段志青[1] 

机构地区：[1]河北科技师范学院化学系,河北昌黎县066600

出　　处：《化学分析计量》2008年第3期52-53,共2页Chemical Analysis And Meterage

摘　　要：对荧光光度法测定饮料中的铅进行实验研究，在3.0mol／L盐酸介质中，Pb^2＋与Cl^-形成PbCl4^2-配合物，此配合物在紫外光照射时发出蓝色荧光，应用荧光光度计检测出铅的含量。采用HNO3-HClO4混合酸体系（体积比为8：1）消化饮料样品。试验了盐酸用量、显色时间、干扰离子对铅测定的影响。该方法的检出限为9.0×10^-3μg／mL，线性范围为0.3-9.0μg/mL，回收率为97.3％-100.2％。Fluorescence spectrophotometry was used for determination of lead in drink. In the medium of 3 mol/L hydrochlo-ride acid, Pb^2＋ and Cl^- formed PbCl4^2- compound, the compound can send blue fluorescence under UV irradiation. The lead content was determined by fluorometer. The samples were digested with HNO3-HClO4 （volume ratio 8：1 ）. The effect of the amount of hydro-chloride acid, coloring time and interference ions was studied. The detection limit was 9.0×10^-3μg/mL, the linear range was 0.3 - 9.0μg/mL, and the recoveries were 97.3% - 100.2%.

关 键 词：荧光光度法 铅 饮料 

分 类 号：O641.4[理学—物理化学] TQ153.2[理学—化学]