microtest® Test Kit Specifications

microtest Sulphite 5

Titrimetric Test for


1 drop = 5 mg/L SO3-

Product Code606200
ContentsHydrochloric Acid, 15 mL
Indicator, 15 mL
Titration Solution, 15 mL
Test Tube, 10 mL
Instructions for Use
Analytical MethodIodometric Titration: In acid conditions, sulphite ions are oxidised by iodine. The titration endpoint is indicated by an excess of iodine causing a colour change from colourless to blue (starch indicator).
Number of Tests50 – 80
InterferencesStrongly alkaline water samples have to be neutralised before testing. Reducing agents other than sulphite (e.g. ascorbic acid) will give positive results.
Measuring RangeThe recommended measuring range is 10 to 100 mg/L (2 – 20 drops @ 5 mg/L) for 5 mL of sample volume. This range can be extended by taking a smaller or larger water sample. For a 2.5 mL sample the measuring range is 20 to 200 mg/L and for a 10 mL sample the range is 5 to 50 mg/L.
Shelf Life2 years
ApplicationsDetermination and monitoring of sulphite levels in food and wine as a preservative, in industrial water treatment (boiler feed water).