Anal Chem. 2011 Dec 15;83(24):9206-12. doi: 10.1021/ac202500m. Epub 2011 Nov 17.
We report a colorimetric system for the detection of HCl in aqueous environments using unlabeled gold nanoparticle (AuNP) probes. This nonaggregation-based detection system relies on the ability of chloro species to cause rapid leaching of AuNPs in an aqueous dispersion containing a strong oxidizing agent, such as HNO(3) or H(2)O(2). The leaching process leads to remarkable damping of the surface plasmon resonance peak of the AuNP dispersion. This method works only with AuNPs of a particular size (∼30 nm diameter). It is highly selective for HCl over several common mineral acids, salts, and anions. This simple and cost-effective sensing system provides rapid and simple detection of HCl at concentrations as low as 500 ppm (far below the hazard limit) in natural water systems.
我们报告了一种使用未标记的金纳米粒子（AuNP）探针在水相环境中检测 HCl 的比色系统。这种基于非聚集的检测系统依赖于氯物种的能力，在含有强氧化剂（如 HNO(3)或 H(2)O(2)）的水溶液中，导致 AuNP 的快速浸出。浸出过程导致 AuNP 分散体的表面等离子体共振峰显著阻尼。该方法仅适用于特定尺寸（约 30nm 直径）的 AuNP。它对 HCl 具有高度选择性，而对几种常见的无机酸、盐和阴离子则没有选择性。这种简单且具有成本效益的传感系统可在天然水系统中以低至 500ppm（远低于危险限值）的浓度快速简便地检测 HCl。
