Application Note Total Phosphate and Nitrogen Digestion in Water

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Gerhardt Turbotherm TT125 Infra-Red Digestion System

Turbotherm TT125 Infra-Red Digestion System

Gerhardt Turbosog  Fume Scrubber for Kjeldahl and other Digestions

Turbosog Fume Scrubber for Kjeldahl and other Digestions

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Vapodest 50s plus VAPODEST Manager Software

Phosphorous levels can be determined by using the same digestion procedure as in the Kjeldahl method for Nitrogen.

The Kjeldahl digestion systems can be used as an acid pre-treatment in total phosphate determination.

Aliquots are removed from the diluted digest in order to perform both Total phosphorous and TKN on the same digest. The aliquot is tested using colourimetry to determine the concentration of Phosphorous in the initial sample.

All automated colourimetric methods require sample and reagent blanks to be performed.


For more information on the Kjeldahl Method for Nitrogen – click here.

For more information on Gerhardt Traditional Kjeldahl Equipment  - click here.

For more information on Gerhardt Modern Digestion Equipment - click here.

For more information on Gerhardt Vapodest Rapid Distillation Equipment - click here.

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