airpointer®Hydrogen Sulphide (H2S)
Hydrogen Sulfide is a highly toxic and corrosive gas with a bad smell. H2S is a product of biogenous digestion. It can be found in refineries, blast furnaces, pulp and paper industry, gasworks, cokeries, wastewater and biogas plants.
Sources: WHO Regional Publications, European Series, No. 91, "Air quality guidelines for Europe", 2nd edition, 2000; GESTIS Stoffdatenbank (http://www.hvbg.de/d/bia/fac/stoffdb/index.html); U.S. Environmental Protection Agency (www.epa.gov)Health and Environmental Effects
H2S destroys haemoglobin and paralyzes the intracellular respiration. In contact with humidity at mucous membranes it converts to alkaline sulfides causing heavy irritation in eyes, nose, throat and lung. H2S is neurotoxic. The bad smell of H2S is unbearable. The lower limit of detection by humans may be as low as 2 ppb. Because of its acidity H2S is a very corrosive gas. It damages switchpanels and other electronics in the plants.Hydrogen Sulfide and the airpointer®
H2S/SO2 Converter, Ultraviolet Fluorescence
SO2 is scrubbed from the sample gas. H2S is thermally converted to SO2 and measured by UV fluorescence. For details about SO2 measurement, see SO2 leaflet. Equipped with an H2S module the airpointer® is capable to measure H2S only, SO2 only, or both cycling with a minimum switching time of 5 minutes.
| Component | Principle of Measurement | Range | Units | Lower Detectable Limit | Zero Drift | Span Drift |
| Hydrogen Sulfide (H2S) | UV Fluores- cence | Dynamic range up to 10 ppm |
ppm,ppb, μg/m3, mg/m3 |
0.5 ppb | < 1.0 ppb | ± 1 % of reading > 100ppb |