Liquid TOC TNb

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Deuterium
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Liquid TOC TNb

Hi,
I am interested in purchasing a TOC analyser for liquid samples. I would also like to determine TNb and I see that three types of detectors are available for N detection: (i) NDIR (ii) Chemiluminescence and (iii) electrochemical cell detector. Can anyone help me with identifying the pros and cons of these detectors for N detection with respect to (i) sensitivity (ii) stability and reproducibility (iii) range of detection (iv) ruggedness.
Thanks