Potassium iodate starch test paper MN90753 1 box

The presence or absence of sulfurous acid (H2SO3) or sulfite ions (SO32-) is detected by soaking the material in potassium iodate (KIO3) and starch. The white test paper will turn blue-purple where the solution is dropped. Quantitative and semi-quantitative measurements are not possible. Detection limit: 5mg/L SO2 Measurable pH value: Neutral Size: 7mm wide x 5m roll (with plastic dispenser)