Is there an optimum pH for the ultra-low range chlorophosphonazo colorimetric hardness test?

Document ID

Document ID TE295

Version

Version 4.0

Status

Status Published

Published Date

Published Date 08/07/2018
Question
Is there an optimum pH for the ultra-low range chlorophosphonazo colorimetric hardness test?
Summary
Optimum pH for the ultra-low range chlorophosphonazo reaction
Answer
The pH after the addition of indicator should be 7.25 (± 0.10). If this pH is not achieved then sample pretreatment might be necessary for best results.

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