“…In the past few years, some techniques have been developed for the determination of CR, such as ultraviolet-visible (UV-vis) absorption spectrometry, 2 uorescent methods, 1,4,5,7 electrochemical methods, 3,6,8 surface-enhanced Raman scattering (SERS), 9 high-performance liquid chromatography (HPLC) 10 and so on. The UV-vis absorption spectrometry is a commonly used method for quantifying CR.…”