Page 8 - 5_TOC in daily practice

SCA-130-503

The conversion of the nitrogen containing Subsequently, the gas mixture enters the
compounds takes place via combustion in an chemiluminescence detector, connected in
oxygen atmosphere higher than 700 °C to series, where the nitrogen content is
nitrogen oxide, which reacts with ozone to determined (See Figure below).
activated nitrogen dioxide (NO 2*). In the
subsequent reaction to NO 2, light quanta are
emitted (chemiluminescence) that are
measured by the detector.

■ Simultaneous TN determination using
the TNM-L
Based on the similar oxidation process, the
TN b determination can be carried out
simultaneously with the TOC measurement.
For this application, the TNM-L option is
installed on the top of the main TOC-L
system.

Fig. Simultaneous TOC/TN-Determination

It should be noted that an optimal injection
volume must be selected for both

Fig. TOC-L CSH with TNM-L Modul parameters.

The benefit is that no additional laboratory ■ Recommended Analyzer / Configuration
space is required.
TOC-L CXX with TNM-L
For the simultaneous determination, the ASI-L
sample is injected onto the catalyst at 720 °C.
All carbon atoms present in the sample are
converted to CO 2 and, in parallel, the nitrogen
atoms to NO. The gas mixture is then
transported by the carrier gas stream through
the NDIR detector, where the carbon dioxide
content is measured.