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(a) The UV/Vis spectra of “MP + Fe3+” complex (Molar ratio = 1:1) with addition of F¯. (b) Absorption of “MP + Fe3+” complex adding with a series of anions (F¯, Cl¯, Br¯, I¯, CrO4¯, PO43-, NO2¯, S2O32-, SCN¯ and AC¯). (c) Absorption of “MP + Fe3+” complex with the addition of F¯. (d) Working curve of F¯ (2.5–15.0 μM) at 489 nm.
