What causes the Astro TOC/1950+ to read high?

Document ID

Document ID TE2313

Version

Version 2.0

Status

Status Published

Published Date

Published Date 27/05/2017
Question
What causes the Astro TOC/1950+ to read high?
Summary
Astro TOC/1950+ Reading High
Answer
High readings stem from issues on the left side of the analyzer. 1. Can be caused by weak phosphoric acid. If it is not strong enough, the TIC will not be removed and the reading will be high. Check the pH of the sample line to make sure it is <3. 2. If the sparger is clogged the TIC will not be removed completely. Check for bubbles. 3. The alkalinity might be too high. If the CaCO3 >830ppm, the reaction will fail. 4. IR Bench error - check the gas calibration on the IR bench.