Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
Analyst. 2018 Apr 30;143(9):2035-2041. doi: 10.1039/c8an00508g.
We report the electrochemical sensing of Hg2+ based on tannic acid capped gold nanoparticle (AuNP@TA) complexes. At optimal conditions using square wave voltammetry, the presented analytical method exhibits a "measurable lower limit" of 100.0 fM. This limit is considerably below the permissible level of 30.0 nM for inorganic mercury in drinking water, specified by the World Health Organization (WHO). The effect of potentially interfering ions, such as Zn2+ and Al3+, was studied and results indicate an excellent selectivity for Hg2+. The transfer of the proposed strategy onto AuNP@TA modified screen-printed electrodes demonstrates its applicability to routine monitoring of Hg2+ in tap water.
我们报告了基于单宁酸包覆金纳米粒子（AuNP@TA）复合物的电化学传感汞离子（Hg2+）的研究。在最佳条件下，使用方波伏安法，所提出的分析方法显示出 100.0 fM 的“可测量下限”。这一限制远低于世界卫生组织（WHO）规定的饮用水中无机汞的允许水平 30.0 nM。研究了潜在干扰离子（如 Zn2+和 Al3+）的影响，结果表明对 Hg2+具有极好的选择性。该策略转移到 AuNP@TA 修饰的丝网印刷电极上，证明了其在自来水中常规监测 Hg2+的适用性。
