Kinetic Fluorimetric Measurement of Trace Resorcinol1 in Phenol Mixtures

A kinetic spectrofluorimetric method was studied to measure the concentration of trace resorcinol. The proposed method is based on the inhibitory effect of resorcinol on the oxidation of rhodamine B by potassium bromate in the medium of dilute sulfuric acid. The detection limit and linear range of the proposed resorcinol measurement method are 12 μg L⁻¹ and 24∼280 μg L⁻¹, respectively. Relative standard derivations of eleven measurements for 80 μg L⁻¹ and 200 μg L⁻¹ resorcinol solutions are 2.12% and 1.08%, respectively. The trace of resorcinol can be determined directly by the proposed method without any pre-separation process when phenol and many other phenolic compounds are present.