Kinetic fluorimetric measurement of trace resorcinol 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 mu g L-1 and 24 similar to 280 mu g L-1, respectively. Relative standard derivations of eleven measurements for 80 mu g L-1 and 200 mu g 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.