Pack Size: box of 100 strips
Hazard Class /UN Number: Not Restricted
Storage Temp: Room Temperature
Test sticks for the semi-quantitative determination of sulphite in solutions
Gradation of scale: 0-10-25-50-100-250-500-1000 mg/l SO 3 2- white to salmon
Strongly or weakly acidic solutions have to be buffered with solid sodium acetate prior to testing, since the test paper does not react with sulphites in acidic media. Sulphide ions interfere since they also produce a red reaction colour of the test paper in neutral solution. This interference can be eliminated by the addition of an excess of nickel(II) ions. The NiS formed can be removed by filtration. Larger amounts of reducing agents, such as hydroxylammonium chloride or ascorbic acid, interfere, causing low sulphite results.