Determination of Cyanuric Acid in Milk Powder and Swimming Pool Water by Ion-pair Reversed-phase Liquid Chromatography

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 carried out on a reversed-phase C(18) 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.