Can monochloramine be determined using free and total chlorine DPD chemistry?

Document ID

Document ID TE186

Version

Version 5.0

Status

Status Published

Published Date

Published Date 04/02/2019
Question
Can monochloramine be determined using free and total chlorine DPD chemistry?
Summary
Calculating monochloramine using DPD chlorine chemistry
Answer
Hach does not recommend using the difference between a total and free DPD chlorine test for measuring monochloramine. This is because high levels of monochloramine interfere with the free DPD chlorine test, causing the reading to continually increase. Therefore an accurate reading for free chlorine in chloramination systems cannot be measured. Free chlorine method 10241 using indophenol is recommended.

Was this answer helpful?

Submitting...
Thank you for your feedback!
There was an error with your submission. Please try again.