Due to the potential threats of phosgene and nitrite to public health and safety, in this work, we first proposed the application of a facile dual-function fluorescent probe 2-(1H-Benzimidazol-2-yl)Aniline (BMA) for the detection of phosgene and nitrite in different solvent environments. BMA had fast response (1 min), high selectivity and sensitivity (the limit of detection was 1.27 nM) to phosgene in CH₃CN solution (containing 10% DMSO), which manifested as a ratiometric fluorescent mode from 416 nm to 480 nm. The response of BMA to nitrite in HCl solution (pH = 1, containing 10% CH₃CN) was also highly selective and sensitive (the limit of detection was 60.63 nM), which shown as a turn-off fluorescent mode at 485 nm. In addition, two portable chemosensors (BMA-loaded TLC plates and test strips) had also been successfully manufactured for the detection of phosgene in the gas phase and nitrite in solution, which displayed good responses. Most importantly, BMA had also been successfully used for detection of nitrite in food samples, and a good recovery (88.5%–107.2%) was obtained by adding standard sodium nitrite.

由于光气和亚硝酸盐对公众健康和安全的潜在威胁，在这项工作中，我们首先提出了一种简便的双功能荧光探针2-（1H-苯并咪唑-2-基）苯胺（BMA）的检测应用。不同溶剂环境中的光气和亚硝酸盐含量 BMA对CH ₃ CN溶液（含10％DMSO）中的光气具有快速响应（1分钟），高选择性和灵敏度（检测极限为1.27 nM ），表现为416 nm至480 nm的比例荧光模式。BMA对HCl溶液（pH = 1，含10％CH _3的亚硝酸盐）的响应CN）也具有很高的选择性和敏感性（检测限为60.63 nM），显示为485 nm处的关闭荧光模式。此外，还成功制造了两个便携式化学传感器（装有BMA的TLC板和测试条），用于检测气相中的光气和溶液中的亚硝酸盐，显示出良好的响应。最重要的是，BMA还已成功用于食品样品中亚硝酸盐的检测，通过加入标准亚硝酸钠，可以获得良好的回收率（88.5％–107.2％）。