Sulphur (Sulfur) Oxides (SOx) are compounds of sulphur and oxygen molecules such as SO, SO2, SO3, S7O2, S6O2, S2O2, etc.
Reference Definition by Ifc.org: Sulphur Oxides (SOx) are compounds of sulphur and oxygen molecules. Sulphur dioxide (SO2) is the predominant form found in the lower atmosphere. It is a colourless gas that can be detected by taste and smell in the range of 1,000 to 3,000 micrograms per cubic meter (µg/m3). At concentrations of 10,000 µg/m3, it has a pungent, unpleasant odour. Sulphur dioxide dissolves readily in water present in the atmosphere to form sulphurous acid (H2SO3). About 30% of the sulphur dioxide in the atmosphere is converted to sulphate aerosol (acid aerosol), which is removed through wet or dry deposition processes. Sulphur trioxide (SO3), another oxide of sulphur, is either emitted directly into the atmosphere or produced from sulphur dioxide and is rapidly converted to sulfuric acid (H2SO4).
Related Definitions in the Project: The Plant and Process Unit
