School of Chemical Engineering, The University of Adelaide , Adelaide, SA 5005, Australia.
ACS Appl Mater Interfaces. 2014 Aug 13;6(15):12971-8. doi: 10.1021/am502882d. Epub 2014 Jul 24.
Herein, we present an ultrasensitive, cost-competitive, and portable optical sensing system for detecting ionic mercury in environmental water. This analytical system combines structurally engineered and chemically modified nanoporous anodic alumina rugate filters (NAA-RFs) with reflection spectroscopy (RfS). The sensing performance of the proposed system is assessed through several tests, establishing its sensing performance (i.e., linear working range from 1 to 100 μM of Hg(2+), low limit of detection 1 μM of Hg(2+) ions (i.e., 200 ppb), and sensitivity of 0.072 nm μM(-1)), chemical selectivity (i.e., exposure to different metal ions Co(2+), Mg(2+), Ni(2+), Cu(2+), Pb(2+), Fe(3+), Ca(2+), Cr(6+), and Ag(+)) and metal ions binding mechanism (i.e., fitting to Langmuir and Freundlich isotherm models). Furthermore, the detection of Hg(2+) ions in tap and environmental water (River Torrens) is successfully carried out, demonstrating the suitability of this system for developing environmental point-of-analysis systems.
在此，我们提出了一种用于检测环境水中离子汞的超灵敏、具有成本竞争力和便携的光学传感系统。该分析系统将结构工程化和化学改性的纳米多孔阳极氧化铝波纹滤光片 (NAA-RFs) 与反射光谱 (RfS) 相结合。通过多项测试评估了所提出系统的传感性能，确定了其传感性能（即 1 至 100 μM 的 Hg(2+)的线性工作范围、1 μM 的 Hg(2+)离子（即 200 ppb）的低检测限和 0.072 nm μM(-1)的灵敏度）、化学选择性（即暴露于不同的金属离子 Co(2+)、Mg(2+)、Ni(2+)、Cu(2+)、Pb(2+)、Fe(3+)、Ca(2+)、Cr(6+)和 Ag(+)）和金属离子结合机制（即符合 Langmuir 和 Freundlich 等温线模型）。此外，还成功地在自来水中和环境水中（Torrens 河）检测到了 Hg(2+)离子，证明了该系统适用于开发环境现场分析系统。
