摘要
以金纳米粒子修饰玻碳电极为工作电极,采用超声-微分脉冲阳极溶出伏安法连续测定饮用水中痕量铅(Ⅱ)和铜(Ⅱ).通过原子力显微镜(AFM)对金纳米粒子的形貌和大小进行表征,对超声波提高伏安检测信号的工作机理作了比较详细的探讨.实验结果表明,超声波-伏安法提高了方法的灵敏度,与传统的微分脉冲伏安法相比,Pb(Ⅱ)和Cu(Ⅱ)的峰电流分别增大10倍和8倍.Pb(Ⅱ)和Cu(Ⅱ)离子在质量浓度10～250μg·L-1和5～200μg·L-1范围内成良好的线性关系,相关系数分别为0.9943和0.9985.在含有50μg·L-1Pb(Ⅱ)和20μg·L-1Cu(Ⅱ)的溶液中重复测定9次,其相对标准偏差为3.5%和2.2%,Pb(Ⅱ)和Cu(Ⅱ)的检出限分别为0.3ng·mL-1和0.1ng·mL-1.该方法成功应用于饮用水中痕量Pb(Ⅱ)和Cu(Ⅱ)的检测,方法简便可靠,具有实际应用意义。
The simultaneous determination of trace Pb（Ⅱ） and Cu（Ⅱ） in drinking water by sono-differential pulse anodic stripping voltammetry on a gold nanoparticle-modified glassy carbon electrode was reported. The morphology and size of gold nanoparticles were characterized by atomic force microscopy （AFM）. The principal mechanism of the sonochemical reactions that can improves the voltammetry signal was discussed. The results indicated that the sensitivity was improved by the sono-voltammetry. In comparison with the traditional different pulse voltammetry, stripping signals were enhanced 10 times for Pb（Ⅱ） and 8 times for Cu（Ⅱ）, respectively. The good linear range was 10-250μg·L^-1 for Pb（Ⅱ）, and 5-200μg·L^-1 for Cu（Ⅱ） with correlation coefficients of 0.9943 and 0.9985, respectively. High reproducibility for the gold nanoparticle-modified glassy electrode was indicated from the relative standard deviations of 3.5% for Pb at 50μg·L^-1 level and 2.2% for Cu at 20μg·L^-1 level （n=9）. The limits of determination were 0.3 ng·mL^-1 for Pb and 0.1 ng·mL^-1 for Cu. Finally, this proposed method was successfully applied to the determination of Pb and Cu in drinking water. The great advantages of the proposed method were characterized by the simplicity, reliability and usefulness for application.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2009年第3期225-230,共6页
Acta Chimica Sinica
基金
上海市世博会专项基金(No.06dz05824)资助项目
关键词
超声
溶出伏安法
金纳米粒子
铅
铜
ultrasound
stripping voltammetry
gold nanoparticle
lead
copper
