Ozone

This is a filter paper impregnated with potassium iodide (KI) and starch for the detection of nitrite and free chlorine. Nitrite or free chlorine oxidize potassium iodide to form elemental iodine which reacts with the starch in known manner. Potassium iodide starch paper may be used by dipping it into the solution to be tested. More often, however, it is used in the manner of a spot test by applying drops of the solution to the paper.
Depending on the type of application, we supply three grades differing in absorption properties and paper surface: MN 816 N standard grade Cat. No. 90754, MN 260 HE high sensitivity grade Cat. No. 90757, and MN 616 T recommended for spot tests Cat. No. 90758. Recommended application: end point detection during diazotations (for this reason, potassium iodide starch paper is sometimes called Diazonium paper); general test for organic substances. Instruction Sheet (pdf)

Color reaction: Chlorine: white → blue-violet; Nitrite: white → blue-violet

Scope of delivery: 200 test strips in a plastic box

Ozone is a colourless toxic gas. An ozone content of 180 micrograms/m3 is considered as critical value above which sensitive persons should avoid stronger physical exertion.
Method of application: Place a test stick in the open air, protected from wind. If necessary, fix the test stick with a piece of adhesive tape. After 10 minutes compare the test field with the color scale on the container. Under standard conditions (101300 Pa, 20°C) 90 micrograms per meter cube is 0.0451 ppm, 150 micrograms per meter cube is 0.0752 ppm, 210 micrograms per meter cube is 0.105 ppm. Instruction Sheet (pdf)

Color Reaction: White → brown

Scope of delivery: 12 test strips in a tube