Starch & Potassium Iodide Paper

• Used to measure the presence of oxidising agents such as nitrite, free chlorine, iodine and peroxide
• Also used to monitor diazotization reactions
• Oxidising agents react with potassium iodide to produce elemental iodine which in turn reacts with the starch to form a blue-violet colour reaction
• The paper can be dipped into the sample or drops can be placed on it
• The paper is moistened with distilled water to detect oxidising gases