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Effect of different pH (1–9) of Ce6 in UV absorbance and fluorescence. (A) UV absorption spectra of Ce6 (pH 1–9). (B) Fluorescence intensity of Ce6 (pH 1–9). (C) Comparison of normalized absorbance (Nor. Abs.) and fluorescence intensity (Nor. Fluor.). (D) Corresponding 3D plot. The Ce6 was analyzed in 10 ppm. Absorbance and fluorescence wavelengths were at 662 and 668 nm, respectively.
