LC-OCD-OND stands for Liquid Chromatography – Organic Carbon Detection – Organic Nitrogen Detection.

Apart from OCD there are more detectors added, a UV-detector at 254nm (UVD) and an organic nitrogen detector (OND).
As ”LC-OCD-UVD-OND” would be too long it is common to use to keep the old name ”LC-OCD”.

 

Flow scheme of Model 8 system.

 

This is, how the system works in general:

  • Mobile Phase is pre-cleaned by UV-Oxidation in the DOCOX-reactor and pumped to an autosampler and then to the chromatographic column.
  • The liquid enters the UV-detector (UVD) and then the Organic Carbon Detector (OCD).
  • A side stream after UVD enters a special capillary UV-lamp (DONOX) and then a 2nd UV-Detector measuring at 220nm.
    In this DONOX-reactor Dissolved Organic Nitrogen (DON) and ammonium is oxidized to nitrate and afterwards determined.

You may find further informations for the specific components on the following pages.

Organic Carbon Detector

Organic Nitrogen Detector

Components overview

Reproducibility informations