Chemguide: Support for CIE A level Chemistry
Learning outcome 9.6(k)
This statement is about the use of sulphur dioxide as a food preservative.
Before you go on, you should find and read the statements in your copy of the syllabus.
Sulphur dioxide is used as a preservative in, for example, wine and dried fruit and vegetables.
It has two functions. It is a reducing agent and so slows oxidation of the wine or dried fruit by oxygen in the air. And it also kills bacteria.
© Jim Clark 2011 (modified June 2012)