Dictionary entry overview: What does isle mean? â¢ ISLE (noun) The noun ISLE has 1 sense: 1. a small island Familiarity information: ISLE used as a noun is very rare.
The sulfate ion is SO42- The sulfite ion is SO32- and is more basic that sulfate.
Sulfites are used as a food preservative or enhancer. They may come in various forms, such as: 1  Sulfur dioxide, which is not a sulfite, but a closely related chemical oxide. 2  Potassium bisulfite or potassium metabisulfite.