TOC is a popular analytical technique in water quality testing, as seen in many official analytical methods today. The United States Pharmacopoeia (USP), European Pharmacopoeia (EP) and Japanese Pharmacopoeia (JP), recognize TOC as a required test for purified water and water for injection (WFI).
TOC Overview
TOC analyzers can measure:
- Total carbon (TC)
- Total organic carbon (TOC)
- Inorganic carbon (IC)
- Nonpurgeable organic carbon (NPOC)
TOC measurement involves:
- Oxidizing organic carbon in a sample
- Detecting and quantifying the oxidized carbon (CO2)
- Presenting the result in units of mass of carbon per volume of sample
NDIR Pressurization
Pressurized detection, or static read, is a technique used for concentrating the CO2 produced by the oxidation of the sample. The technique can be used for both qualitative and quantitative analysis. In this section the basics of the pressurization technique will be described.
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