A highly selective chemiluminescent H2S sensor

When it passed over the surface of Fe2O3, H2S was catalytically oxidized by O-2 in air that resulted in intensive chemiluminescence (CL). A novel H2S sensor based on this kind of CL was developed. Six catalysts were examined and the results showed that the CL intensity based on Fe2O3 was almost 10 times higher than that of the other five. An important advantage of the novel CL H2S sensor was its high selectivity to H2S without the response to other 12 kinds of gases such as hydrocarbon, alcohol, NO2, etc. The response time of the CL sensor to H2S was within 15 s and the recovery time was within 120 s. The linear range of the CL sensor under the optimal conditions was in the range from 8 to 2000 ppm over two orders of magnitude with the detection limit of 3 ppm. The stability of the sensor was examined for 100 h by introduction of 100 ppm H2S into the sensor. No significant decrease of CL signals has been recorded during the time. (C) 2004 Elsevier B.V. All fights reserved.