Is the pH of the sample important when measuring iron?

Document ID

Document ID TE319

Published Date

Published Date 27/05/2017
Question
Is the pH of the sample important when measuring iron?
Summary
pH of the sample when measuring iron
Answer
Yes; the colorimetric methods testing for iron, with the exception of ferrous iron method, require the sample pH to be between 3 and 4. It is important to not exceed a sample pH 5 as iron may precipitate.