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%.