“…To date, various analytical methods have been used to detect metal ions and anions, including chromatography, mass spectrometry, electrochemical atomic absorption/ emission spectrometry, graphite flame atomic absorption spectrometry, voltammetry, solid phase microextraction, high performance liquid chromatography, inductively coupled plasma atomic emission spectrometry, plasma resonance rayleigh scattering spectroscopy, Raman spectroscopy, spectrophotometry and ion mobility spectroscopy. [3,7,15,22,32,[37][38][39] However, most of these technologies have high cost, low sensitivity, long time-consuming, complex preprocessing and need skilled operators. [8,17,26,35] In contrast, fluorescent probe detection has the characteristics of high selectivity, high sensitivity, low cost, rapid response, visualization and biological imaging, which can make up for the shortcomings of traditional analytical methods.…”