FI-Chemiluminescence Determination of Trace Amount of Catechol

Based on the chemiluminescence(CL) reaction of oxidation of catechol by potassium chlorate in dil.HCl solution,a FI-CL method for determination of trace amounts of catechol was proposed.Under optimum conditions,linear relationship between values of CL intensity and mass concentration of catechol was obtained in the range of 1.0×10-4-1.0×10-2mg·L-1,with detection limit(3S/N) of 3.9×10-5mg·L-1.Precision of the method was tested at the concentration level of 1.0×10-3mg·L-1 of catechol,for 11 determinations,value of RSD found was 3.4%.Catechol in samples of natural water was purified by solid phase extraction,and determined by the proposed method,giving values of recovery by the standard addition method in the range of 97.8%-100.3%.