Simultaneous determination of N,N-dimethylaniline and phenol in wastewater by high-performance liquid chromatography...

A method using HPLC-CL linkage was developed for simultaneous determination of N,N-dimethylaniline and phenol in wastewater, based on the strong sensitive chemiluminescence of the luminol-K3Fe(CN)6 systems in alkaline medium. The separation was carried out on a Hypersil ODS column with a mobile phase of ethanol-0.01% triethylamine (2:1, v/v). The linear ranges for N,N-dimethylaniline determinations were 2.0 x 10(-7) - 2.5 x 10(-5) g/mL and 4.0 x 10(-5) - 1.5 x 10(-4) g/mL with a detection limit (3sigma) of 1.20 x 10(-8) g/mL; the relative standard deviation (3sigma) for 5.0 x 10(-6) g/mL N,N-dimethylaniline was 1.4% (n = 6). The range for phenol was from 5.1 x 10(-7) to 1.3 x 10(-4) g/mL, and a detection limit (3sigma) of 2.5 x 10(-8) g/mL could be obtained. The method can be useful for the determination of N,N-dimethylaniline and phenol in some environmental samples.