Are there any precautions for using the chlorine test in bright sunlight?

Document ID

Document ID TE207

Published Date

Published Date 27/05/2017
Question
Are there any precautions for using the chlorine test in bright sunlight?
Summary
Chlorine testing in bright sunlight
Answer
Chlorine testing in bright sunlight can cause inaccurate measurement because sunlight can react with the DPD indicator during the 3-minute reaction time for total chlorine. It is recommended to keep the sample covered during the reaction time if testing outdoors.