Can extreme pH affect the color formation in the PhosVer® 3 test for total phosphorus?

Document ID

Document ID TE1474

Published Date

Published Date 27/05/2017
Question
Can extreme pH affect the color formation in the PhosVer® 3 test for total phosphorus?
Summary
PhosVer® 3 Method pH
Answer
Yes. When adding NaOH the pH should be adjusted to 7 or slightly acidic. The sample pH after addition of PhosVer® should be around 1-2.