sulphur dioxide ions in solution in must, juice or wine that are not chemically bound to other chemicals in solution and are free to react with acetalhyde or oxygen.

swaweldioksied ione wat in oplossing is in mos, sap of wyn, en wat nie in oplossing aan ander chemikalieë gebind is nie en wat vry is om met asetaldehied of suurstof te reageer.