Using o-tolidine as an indicator of chlorinated water

Siu Hing LING

Research output: Contribution to journalArticlespeer-review


O-tolidine reagent can be used to successfully indicate the presence of chlorine in water. The reagent should preferably be at or below pH 1.3. The o-tolidine test could be used to test industrial processed water and for swimming pools. O-tolidine is toxic therefore should be used with care. A number of drops of the o-tolidine reagent should be placed into a test tube of water. If the water is chlorinated it will turn yellow after around five minutes. Copyright © 1998 Association for Science Education.
Original languageEnglish
Pages (from-to)111-112
JournalSchool Science Review
Issue number289
Publication statusPublished - Jun 1998


Ling, S. H. (1998). Using o-tolidine as an indicator of chlorinated water. School Science Review, 79(289), 111-112.


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