An ion-pair reversed-phase high-performance liquid chromatographic method, using tetrabutylammonium bromide (TBAB) as ion-pair reagent, has been developed for the analysis of cyanuric acid (CA) in milk powder and swimming pool water. It was found that the effect of the concentrations of ion-pair reagent on the retention of cyanuric acid was different for standard solution and different real samples. The separation was carded out on a reversed-phase C18 column with 85: 15 (V/V) water-acetonitrile (ACN) containing different concentration of TBAB as mobile phase for different samples. The linear range of the calibration curve for CA was 0.1-100 mg·L-1. The detection limits calculated at S/N=3 was 0.11 mg·L 1 for the analysis of milk powder and 0.31 mg·L-1 for the analysis of swimming pool water, respectively. The method was successfully applied to the analysis of CA in milk powder and swimming pool water.
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