What are some methods other than an electrode for measuring pH and when can I use them?

Document ID

Document ID TE360

Published Date

Published Date 27/05/2017
Question
What are some methods other than an electrode for measuring pH and when can I use them?
Summary
Alternative tests to measure pH
Answer
If regulatory reporting is not required, pH measurements can be made using test kits, colorimeters, or test strips. Choose the method that best matches your accuracy requirements and ease of use.

-A pocket tester should be used when the sample has color or is visibly turbid. Pocket testers can measure across the full pH range and give results to the nearest 0.1 pH unit, however they must be calibrated using pH buffers regularly.
-Test kits and colorimeters give an accuracy of 0.1 to 0.5 pH units in a limited pH range. Oxidants such as chlorine can interfere with these tests. Add one drop of 0.1 N sodium thiosulfate before adding the pH indicator to remove chlorine interference.
-Test strips give semi-quantitative results over various ranges.