Shimadzu TOC Analyzer

Shimadzu TOC-LCPH with TNM-L

Location

Great Lakes Research Center 304A

906-487-2025

Total organic carbon: Total organic carbon is analyzed using the Shimadzu TOC-L_CPH analyzer with TNM-L. Prior to injection, samples are acidified to convert inorganic carbon to CO₂, then sparged to remove the CO₂. The remaining carbon is referred to as “non-purgeable organic carbon”, or NPOC. The sample is injected into a combustion tube that contains an oxidation catalyst, and is combusted at 680°C to convert the organic carbon into CO₂. Carbon-free carrier gas delivers the CO₂ to a non-dispersive infrared (NDIR) gas analyzer, and the NDIR signal forms a peak that is measured.
High sensitivity TOC: High sensitivity TOC measurements are for samples under 3 mg-C/L. The standard catalyst is replaced with a high-sensitivity catalyst that has a higher surface area. The remainder of the method is the same as the standard NPOC method (above).
- NOTE: If samples with higher amounts of TOC are submitted for high-sensitivity analysis, this can lead to carryover and cause issues with the catalyst. Please contact us with questions or you are unsure which TOC analysis is appropriate for your samples.

Total nitrogen: Total nitrogen is analyzed using the Shimadzu TOC-L_CPH analyzer with TNM-L. Samples are combusted at 720°C and TN decomposes to nitrogen monoxide. The carrier gas delivers the nitrogen monoxide to a chemiluminescence gas analyzer, where a peak that can be measured is generated.
Inorganic carbon: Inorganic carbon is analyzed using the Shimadzu TOC-L_CPH analyzer with TNM-L. The inorganic carbon measured in this method includes carbonates and dissolved carbon dioxide. Samples are acidified to convert carbonates to CO₂. This CO₂, plus dissolved CO₂ in the sample, are sparged with carbon-free carrier gas to volatilize the CO₂ and deliver the CO₂ to a non-dispersive infrared (NDIR) gas analyzer. The NDIR signal forms a peak that is measured.

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