For detection of TOC the converted CO2 proportional to the organic and inorganic carbon can be analysed using Conductivity or Non dispersive infrared (NDIR) methodology.
The combustion process uses heat at 680oC or higher temperature in a stream of air, oxygen or nitrogen and usually in presence of a catalyst.
Dissolved organics and particulate organics are expected to oxidise fully to carbon dioxide under these conditions.
The catalysts vary from cupric oxide, cobalt oxide or platinum on an alumina support.
The sample is treated with persulphate at 116 to 130 degrees C in presence of UV to convert inorganic and organic carbon to CO2.