示差脉冲阳极溶出伏安法测定莲子芯中微量铅  

Determination of Micro-Amounts of Lead in Lotus Plumule by Differential Pulse Anodic Stripping Voltammetry

作　　者：张君[1] 袁倬斌[2] 

机构地区：[1]内蒙古大学化学化工学院,呼和浩特010021 [2]中国科学院研究生院应用化学研究所,北京100049

出　　处：《理化检验（化学分册）》2007年第9期776-777,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金："十五"科技攻关重大项目(2001BA210A04-7);国家自然科学基金(20175025);国家自然科学基金分析化学重点基金(20235010);电分析化学国家重点实验室基金资助。

摘　　要：采用自制丝网印刷微电极,结合阳极溶出法对微波消解后的莲子芯中的微量铅进行了测定。考察了微波消解条件、缓冲溶液pH值、富集电位、富集时间、脉冲强度、脉冲周期等对检测的影响。试验结果表明:在pH 3.6的乙酸-乙酸钠缓冲溶液中,—1.1 V富集10 s后,电流与铅的质量浓度在1～1000μg·L^(-1)范围内呈线性关系,相关系数为0.996。测定结果的相对标准偏差(n=5)小于5%,加标回收率为101.9%。Lead in lotus plumule was determined by the differential pulse anodic stripping voltammetry using screen-printed microelectrode.Lotus plumule sample was digested in a micro-wave oven under 500 kpa for 1 h. Various factors affecting the determination i.e.,the condition of sample digestion,pH of the sample solution, potential and time of enrichment,pulse intensity and periodicity etc.were studied and optimized.In an acetate buffer of pH 3.6,and by enrichment at-1.1 V for 10 s,linearity was kept between the peak current and concentration of Pb^2＋ in the range from 1μg to 1 mg per liter（r=0.996）.In its application to the analysis of substantial sample of lotus plumule,values of RSD＇s（n=5）and recoveries found were less than 5% and in the range of 101.9% respectively.

关 键 词：示差脉冲阳极溶出伏安法 丝网印刷微电极 微波加热试样消解 铅 莲子芯 

分 类 号：O657.14[理学—分析化学]