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Total Nitrogen Bound TNb Analytical Equipment

What TNb means and how it is measured.

The TNb (total bound nitrogen) shows the pollution of water caused by nitrogen compounds. Nitrogen may be present as ammonia, ammonium salts, nitrites, nitrates and organic nitrogen compounds.

In contrast to single measurements of the above-mentioned components, the TNb determination contains all these substances in a single analysis process.

What TP means and how it is measured.

The TP (total phosphorus) is a sum parameter that shows the organic and inorganic phosphorus compounds in water. Phosphorus is an essential nutrient for humans as well as flora and fauna. However, the substance – depending on its concentration– may cause serious damage.




On-Line Monitoring of Total Bounded Nitrogen (TNb) in process or waste water streams

The monitoring of Nitrogen compounds in water is of paramount importance.  With the accumulation of Nitrogen compounds in water it can lead to an increase in nutrients (euthrophication), and this in turn can lead to an increase in plant growth.  Certain plants such as algae for instance, spread rampantly and disturb the ecological balance.  Hence the importance of monitoring TNb levels in water.     

  • Measurement range: 0 - 200 mg/l N
  • Response time: 1 - 2 minutes
  • Highest combustion temperature (1,200°C) available on the market
  • Measurement of complete samples incl. solids/ particles
  • Excellent detection value from ammonia and nitrate nitrogen
  • High salt concentrations possible
  • Catalyst-free technique
  • No filtration necessary
  • No memory effects
  • According to DIN EN 12260:2003 and ISO/TR 11905-2:1997




  • Waste water treatment
  • Process control
  • FlowSampler
  • Multi-stream measurement
  • Combination with COD and TOC detection


  • IP54 (Standard)
  • NEMA 4X
  • ATEX Zone I
  • ATEX Zone II

Exact Analysis. At 1,200°C, the complete TN is determined.

For an exact TNb measurement all nitrogen bonds - incl. particles - must be reliably combusted. LAR's unique robot system is capable of transporting and measuring a high content of solid matter without any filtration of the sample. Additionally, LAR's high temperature method with combustion at 1,200°C guarantees the complete oxidation of the sample.

Catalysts. For our analysers simply not necessary.

Lower temperatures at 680-1,000°C need catalysts to provide satisfying oxidation power. Even then complex compounds often are not determined. Because of the high temperature the QuickTONultra does not need any catalysts.

High salt concentrations. No problem with the QuickTONultra.

This online TNb analyser can handle salt concentrations up to even 300 g/l sodium chloride (NaCl). Salts that melt at the temperature of 1,200°C are vaporised by the combustion power and carried out with the carrier gas to settle in a special retrieving device.

The QuickTONultra. Ultra quick measurements and maintenance.

The QuickTONultra is designed to operate in a batch mode. The TNb measurement takes place in within 1 - 2 minutes. This speed guarantees that very short peaks can be determined very well during a daily cycle.

The analyser's availability is over 98%. The weekly service is about 30 minutes.

Up to 4 Parameters on ONE Analyser system - the cost effective monitoring of WWTP effluent

  • Total Organic Carbon (TOC),

  • Total Bounded Nitrogen (TNb),

  • Total Phophorus (TP) / Ortho-Posphate (o-P),

  • Chemical Oxygen Demand (COD) 

LAR's QuickTOCNPO is the ultimate online Analyser for the monitoring of WWTP effluent samples.  

Tracking pollution at 1,200°C.

The catalyst-free patented ceramic reactor is the centre piece of the QuickTOCNPO. At 1,200°C, all substances are oxidised without the use or catalysts which enables a complete analysis of samples. The QuickTOCNPO can be delivered with a number of different housings to suit even the most challenging environments with Ex-Zone I and II housings also available.   

The determination of TP / o-P with the use of molybdenum blue.

The Total Phosphorus / o-P is determined by the photometric molybdenum blue method. First the sample is mixed with an oxidising agent then the mixture is fed into the reactor where ultra violet light (UV) activates the sample‘s oxidation. Finally, by adding the molybdenum blue it becomes visible how much TP is in the sample.

Quick measurements and maintenance.

The TNb, TOC and COD measurements take place in less than 3 minutes with the sample being injected directly into the furnace. Maintenance and service requirements are minimal: Less than 30 minutes per week. The analyser‘s availability is over 98%.

Filtration free sample conditioning.

Normally the outlet or effluent of a WWTP is free of particles – or at least there are only a few. In this case the Analyser requires no additional hardware and can use the sample take-up directly from the sample line.  If however there is a high particulate density, the sample should be taken by the filterless, patented FlowSampler.  For more information on the Flowsampler click here

  • Measurement range: TOC: 0.1 - 200 mg/l, TNb: 0.1 - 200 mg/l, TP: 0.01 - 30 mg/l, COD: 1 - 600 mg/l
  • Response time: TOC / COD: 2 - 3 min, TNb: 1 - 3 min, TP: 10 - 15 min
  • Highest combustion temperature (1,200°C) available on the market
  • Photometric molybdenum-blue-method
  • Determination of all 4 parameters at the same time
  • Number of parameters are selectable
  • No filtration necessary
  • No memory effects
  • Very low maintenance and operational costs
  • According to DIN EN 1484:1997-08 (TOC), ISO 8245:1999-03 (TOC), EPA 415.1 (TOC), DIN EN 12260:2003 (TNb), ISO/TR 11905-2:1997 (TNb), DIN EN ISO 6878:2004-09 (TP), DIN EN ISO 15681-1:2005-05 (TP) and DIN EN ISO 15681-2:2005-05 (TP)




  • WWTP control
  • Process control
  • Surface water monitoring
  • Industrial and municipal WWTP
  • FlowSampler
  • Centrifugal separator
  • Single-parameter determination available
  • Combinations of 2 or 3 parameters obtainable

  • IP54 (Standard)
  • NEMA 4X
  • ATEX Zone I
  • ATEX Zone II

For additional information please contact us



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