Sahoo Srikant, Satpati Ashis Kumar, Reddy Annareddy Venkata Ramana
Bhabha Atomic Research Centre, Analytical Chemistry Division, Trombay, Mumbai-40085, India.
J AOAC Int. 2015 Mar-Apr;98(2):506-11. doi: 10.5740/jaoacint.13-355.
An electrochemical method was developed for the determination of Hg at ultratrace levels using an Au nanoparticle (AuNP) array modified carbon paste electrode (CPE) by anodic stripping voltammetry. Scanning electron microscopy measurements imaged the size and shape of AuNPs on the CPE substrate; it was possible to tune the size and the NP density by changing the deposition time and medium. Electrochemical characterization of the AuNP modified CPE was carried out using cyclic voltammetry and electrochemical impedance measurements. Interferences due to some commonly occurring metal ions and surfactants on the stripping peak of Hg were also investigated. The 3σ detection limit for Hg using the AuNP modified electrode was as 0.24 μg/L. This method was applied to determine Hg in soil samples.
开发了一种电化学方法，通过阳极溶出伏安法，使用金纳米颗粒（AuNP）阵列修饰的碳糊电极（CPE）测定超痕量水平的汞。扫描电子显微镜测量对CPE基底上AuNP的尺寸和形状进行了成像；通过改变沉积时间和介质可以调节尺寸和纳米颗粒密度。使用循环伏安法和电化学阻抗测量对AuNP修饰的CPE进行了电化学表征。还研究了一些常见金属离子和表面活性剂对汞溶出峰的干扰。使用AuNP修饰电极时汞的3σ检测限为0.24μg/L。该方法应用于土壤样品中汞的测定。
