A Water-soluble Turn-on Fluorescent Probe of Aluminum Ions Based On Quinoline Derivative and Its Implication for the...

In today's demanding environment, the need for advanced fluorosensors capable of detecting various metal ions, especially aluminum (Al³⁺), which is common in industrial processes and environmental monitoring, is growing. To address this need, we have engineered a highly sensitive fluorescent probe, MSS, which exhibits distinctive greenish-yellow fluorescence specifically in the presence of Al³⁺ ions when illuminated with a 365 nm UV lamp in aqueous medium and has been employed for the detection of picric acid. The Job's plot analysis confirmed a 1:1 stoichiometric relationship between MSS and Al³⁺ ions. The limits of detection (LOD) and quantification (LOQ) are in the µM range. Moreover, we have developed a practical paper-strip-based test kit for on-site cascade detection of Al³⁺ ions and picric acid, enabling quick, efficient monitoring of aluminum levels across diverse environments. The successful detection of Al³⁺ in soil samples further validates MSS as a promising tool for environmental analysis and monitoring.