Determination of Resorcinol and Phloroglucinol in Environmental Water Samples Using Ion Chromatography with Chemiluminescence Detection

A novel method was established for the simultaneous determination of resorcinol and phloroglucinol in environmental water samples by ion chromatography with chemiluminescence detection. Using 50 mM NaOH as eluent, resorcinol and phloroglucinol can be separated well with IonPac AS19 column and determined on the basis of chemiluminescence reaction of luminol and K4Fe(CN)6 in a alkaline medium. The optimal CL conditions were 6.0 × 10−4 M luminol, 0.1 M K4Fe(CN)6 and 5.5 × 10−5 M K3Fe(CN)6. The absence of methanol and acetonitrile in mobile phase made the proposed method more sensitive. Under the optimal conditions, the detection limit (LOD) of resorcinol and phloroglucinol were 4.0 and 4.3 μg L−1, respectively. The method showed good linearity within the range of 0.05-1.0 mg L−1. The relative standard deviations (RSD) for 0.1 mg L−1 resorcinol and phloroglucinol standard solutions were 0.9% and 1.1% (n = 11). The method was successfully applied to the determination of resorcinol and phloroglucinol in environmental water samples.