How can a Total Organic Carbon (TOC) method be used to test for Dissolved Organic Carbon (DOC)?

Document ID

Document ID TE921

Version

Version 4.0

Status

Status Published

Published Date

Published Date 21/01/2019
Question
How can a Total Organic Carbon (TOC) method be used to test for Dissolved Organic Carbon (DOC)?
Summary
Dissolved Organic Carbon using Total Organic Carbon
Answer
The analysis of DOC is almost identical to that of TOC, but the sample must first be filtered through a 0.45 micron pore-size filter. Depending on the volume of sample and level of suspended solids, different types of filters may be used (syringe filters up to electronic-pump filters). None of Hach's TOC analysers have a built-in filter explicitly for DOC, so the filtration needs to be conducted by the user first.

For more information on the relationship between Total Organic Carbon and Dissolved Organic Carbon, see the article titled, " What is the difference and relationship between the various Hach carbon tests?".