In order to make indicator card for measuring available chlorine, reaction colour of potassium iodide and available chlorine was used, and iodometry and the indicator card were compared.

• 利用碘化钾遇有效氯可被氧化成游离碘而显色的原理,制成测有效氯含量指示卡,并与化学滴定法进行比较。