A colorimetric response to hydrogen sulfide

Semiconducting Metal Oxide Based Sensors for Selective Gas Pollutant Detection

“…The following SMO based sensors were successfully modified to selectively detect H 2 S: WO 3 and WO 3 -based materials [159-165], SnO 2 [166-171], ZnO [172,173], copper oxide [170,174,175], platinum and palladium oxides [176,177], indium oxides [177,178], silver based materials [169,179,180], titanium oxide [181] and cadmium oxide sensors [182]. …”

“…Moreover, Cu-SnO 2 composites show strong sensitivity toward H 2 S detection which reaches <10 ppm of H 2 S at a temperature of 100 °C [170,171]. Other sensors containing copper, iron, cadmium, and indium oxides were found to be selective toward H 2 S detection in ppm concentration levels [170,171,174-178,182]. Finally, both ZnO and tellerium oxide films were found to be highly sensitive to H 2 S gases at very low concentration levels [172,183].…”

Designing a reliable leak bio-detection system for natural gas pipelines

“…6; spectroscopic procedures [129][130][131][132][133][134][135][136][137][138][139][140][141] are undoubtedly the most common routes taken, along with chromatographic [142][143][144][145][146][147][148][149][150][151] and electrochemical [152][153][154][155][156][157][158] techniques. The KB (stage 22) also produced alternative detection methods [159][160][161][162][163][164][165][166][167][168][169][170][171][172][173][174][175][176][177], such as elemental...…”

Analytical Aspects of Metal Enolates

“…On short exposure of the optode to the contaminated atmosphere a change in color occurs, the intensity of which is proportional to the H 2 S concentration and is measured with a UV spectrometer. A redox process takes place as shown in equation 6, where L represents the bidentate ligand derivatives of 1,10-phenanthroline, starting with the neutralization of the acac anion to yield acetylacetone, and followed by reduction of Cu(II) to Cu(I) and the concomitant oxidation of bisulfide anions to hydrogen disulfide 218 . the determination of trace amounts of Tb(III) in a synthetic rare earth oxide and a high purity Y 2 O 3 matrix.…”