Effect of humic acid in surface water on the electrochemical performance of bromate detection.

One of the problems of BrO 3 − detection using the electrochemical method, such as a cyclic voltammetry (CV) is that it is impressionable to interferences from Humic acid (HA). The objective of this study was to determine the effect of HA on electrochemical detection of BrO 3 − using metalloporphyrin-based multilayer sensor under different pH conditions in the presence of FeCl 3 . The effect of HA interference on chemical interaction at the electrode surface in the presence of FeCl 3 was determined based on Fourier transform infrared spectrum. CV was used to measure the concentration of BrO 3 − in the solution containing HA with or without different concentrations of FeCl 3 . Results of CV revealed a dynamic linear concentration range of BrO 3 − from 10 to 100 μg/L in 0.1 to 1 mg/L of HA solution (pH 9). The detection limit for BrO 3 − concentration was 8.9 μg/L in 0.1 mg/L of HA solution. [ABSTRACT FROM AUTHOR]