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a colourless soluble pungent gas produced by burning sulphur. It is both an oxidizing and a reducing agent and is used in the manufacture of sulphuric acid, the preservation of a wide range of foodstuffs (E220), bleaching, and disinfecting. Formula: SO 2Systematic name: sulphur(IV) oxide
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use sulphur dioxide in a sentence
Why is it necessary that the fabric be moist in order to be bleached by sulphur dioxide fumes?Textiles|William H. Dooley
It burns with a pale blue flame to form carbon dioxide and sulphur dioxide.
It may be prepared in the amorphous form by heating cobalt with sulphur dioxide, in a sealed tube, at 200 C.
The goods are left thus exposed to the sulphur dioxide overnight, when they are taken out and washed in water.
There are practically but two chemicals which are used in gaseous disinfection, and these are sulphur dioxide and formaldehyde.