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Fluorescence emission spectra of six different solutions. (a) Ultrapure water; (b) NH4 + + Na2SO3 + NaOH solution + sodium citrate; (c) MOPA solution; (d) NH4 + (0.200 μmol/L) + MOPA + Na2SO3 solution; (e) NH4 + (0.200 μmol/L) + MOPA + Na2SO3 + NaOH (pH = 11.4); (f) NH4 + (0.200 μmol/L) + MOPA + Na2SO3 + NaOH + sodium citrate (pH = 11.4).
