If the sample turns purple during the hardness test but never turns blue no matter how much EDTA is add, what does this indicate?

Document ID

Document ID TE282

Version

Version 5.0

Status

Status Published

Published Date

Published Date 07/24/2018
Question
If the sample turns purple during the hardness test but never turns blue no matter how much EDTA is add, what does this indicate?
Summary
Sample turns purple during hardness test
Answer
This is an indication that the sample contains an interfering metal. Dilute the sample and repeat the test. This may dilute the interfering metal to a level at which it does not interfere. If this helps, multiply the result by the dilution factor. If this does not help, follow the suggestions in the interference section of the procedure, found in the Water Analysis Handbook.

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