In this work, we report fast and low-cost fluorimetric system for the determination of trace amounts of water in both aprotic and protic organic solvents. The analytical signal of the proposed method is based on the quenching effects of water on the fluorescence emission spectrum of (4, 4′-diamino-4″-methoxytriphenylamine) molecule. It was found that physical interactions such as hydrogen bonding are responsible for the observed quenching effect. The limit of detection values for the determination of water in DMSO, acetonitrile, ethanol and methanol were 0.0727, 0.0636, 0.0761 and 0.0631 (W/W%), respectively. The limit of quantitation values in DMSO, acetonitrile, ethanol and methanol were 0.2734, 0.2546, 0.2540 and 0.2531 (W/W%), respectively. Simplicity, low cost and high speed of the proposed water sensing system make it a valuable candidate to be used in industrial applications such as quality control procedures. In addition, it can be used for the determination of water in redox active solvents such as DMSO, where the standard Karl Fischer method gives problematic results.

中文翻译：

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4，4'-二氨基-4''-甲氧基三苯胺作为高灵敏度的荧光传感器，用于测定有机溶剂中的水

在这项工作中，我们报告了一种快速，低成本的荧光测定系统，用于测定非质子和质子有机溶剂中的痕量水。所提出的方法的分析信号基于水对（4，4'-二氨基-4''-甲氧基三苯胺）分子的荧光发射光谱的猝灭作用。已经发现，诸如氢键之类的物理相互作用是所观察到的淬灭作用的原因。用于测定DMSO，乙腈，乙醇和甲醇中水的检测极限分别为0.0727、0.0636、0.0761和0.0631（W / W％）。DMSO，乙腈，乙醇和甲醇中的定量限值分别为0.2734、0.2546、0.2540和0.2531（W / W％）。简单，所提出的水传感系统的低成本和高速度使其成为在工业应用（例如质量控制程序）中使用的有价值的候选者。此外，它还可以用于测定氧化还原活性溶剂（如DMSO）中的水，而标准的卡尔·费休方法会产生有问题的结果。