Kinetic Spectrophotometric Detemination of Phenol by Use of Methyl Orange as Indicator

A simple, precise, sensitive and accurate method was developed for the dedermination of trace quantities of phenol. The method is based on the inhibitory effect of phenol on the reaction between bromate and methyl orange in acidic media at 80℃. Phenol could be determined in the concentration range of 0. 40-3. 0 μg/mL,the detection limit is 0.18μg/mL,The relative standard deviation for eleven replicate determination of 1. 0 μg/mL of phenol was 1. 44%. The proposed method was applied to determination the phenol in river water and sewage with satisfactory results.