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On-line Total Nitrogen Analyzer

The TONI™ On-line Total Nitrogen Analyzer meets the needs for fast and reliable monitoring of the regulatory sum parameter Total Nitrogen in all sorts of water bodies. The quantification of Total Nitrogen has traditionally been done by means of the time-consuming and complex (total) Kjeldahl method, developed primarily for organic nitrogen. The water analyzer runs a chemical analysis based on standard method 4500-N with hydrazine reduction and NEDD color solution after persulphate destruction, yet in a completely automated analyzer mainframe. The industrial panel PC controls all steps of the analysis procedure, including sampling, sample transfer, addition of reagents and reporting of the results.

The second generation TONI™, originally introduced in 2001 as a research project, is equipped with a new analyzer enclosure consisting of a solid steel back, combined with an ergonomic ABS hinged part containing the actual wet part. Wet-chemical components are revised for optimal operation and low maintenance:

  • Built-in smart automatic functions
  • Shorter liquid pathways: reagents, cooling, drain
  • Water-cooled reflux condenser for increased stability
  • Transparent door allows instant 180° visual inspection
  • Reduced environmental footprint (60% weight reduction)


On-line, automatic colorimetric measurements of total nitrogen conform standard method 4500-N

Low temperature wet-chemical oxidation

Second generation design with small footprint, shorter liquid pathways and simple maintenance

Complete separation between electronics and wet part

Multiplexing up to eight (8) sampling points possible

Incorporated industrial PC with AppliTek controller software

Extended data communication and exchange features

Analysis method
Standard method 4500-N
Colorimetric measurement using hydrazine reduction and NEDD color solution after persulphate destruction in alkaline medium

Standard measuring ranges
One single range, factory set:
0 – 5 mg/L N
0 – 20 mg/L N
Note: higher ranges available by sample dilution

Cycle time
30 minutes including oxidation of 10 minutes
Note: oxidation time can be set to 60 minutes for difficult samples

Factory calibrated

Automatic, free adjustable sequence

Detection limit
Better than 0.2 mg/l (range 0 – 5 mg/L)

Parameters: Nitrate, Total nitrogen