However, the concentration range around the legislation limit of 10mg/L is very important for the food industry, e.g. fruit juice producers, as fruit juice products with SO2-contents above 10mg/L havetoberejectedbytheconsumerprotectionauthorities.TheIFU 7a is the accepted method for testing SO2. To judge products, the reproducibilityR= 3.82mg/Lofthatmethodhastobeaddedtothe limit of 10mg/L.