Role of Fe(III) in preventing humic interference during As(III) detection on gold electrode: Spectroscopic and voltammetric evidence

- Humic acids interfere with the voltammetric detection of As(III) on gold electrode through adsorption and possible complexation.
- Addition of Fe(III) removes this interference and helps in the electroanalytical detection of As(III).
- FTIR and XPS studies suggest that the formation of Fe(III)-HA complex prevents adsorption of HA on gold and limits As-HA complex formation.