Especially in a continuous flow mode, for TAN concentration of up to 4000ppm.
At that high of a concentration and high pH, I would use an ammonia probe. They give a coarse reading with some delay due to diffusion across a membrane. Also, you will need to have a pH probe in the waste stream so that you can calculate ammonium-N.
For more precise measurements, use a dilution series and wet chemistry methods. They are slower and more labor intensive, but much more accurate.
I would think dilution and use of the Bertholet reaction as per APHA's 'Standard Methods of Water and Wastewter'.
Trouble with my previous suggestion is that ammonium from the ammonium sulfate would also react. Digestion as per Kjeldahl would convert proteins... to ammonium ion which reacts with Bertholet reagents.
Hi,
May be you can use automated colorimetry for determination of nitrogen
ammonia in wastewater : i send you this document but it's in french!
http://ville.montreal.qc.ca/pls/portal/docs/PAGE/ENVIRO_FR/MEDIA/DOCUMENTS/VDM_M-CR-5.4-040_AZOTE_AMMONIACAL.PDF
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