The developed sensing phase exhibits a response time of less than 2 min for hydrogen sulphide concentrations in the linear range. The 3σ detection limit is 4 ppb (v/v) of hydrogen sulphide and the linear range extends up to 200 ppb. The system has been successfully assayed for the measurement of human oral malodour and the results validated by comparison with those obtained for the same patients using a commercially available instrument based on electrochemical measurements.