Kjeldahl System

Name: Kjeldahl System
Brand: Labotronics
Rating: 5 (568 reviews)

Our Kjeldahl systems are specialized laboratory instruments designed for the determination of nitrogen content in organic and inorganic samples, particularly in food, agriculture, and environmental analysis. Named after its inventor, Johan Kjeldahl, this method involves a series of chemical reactions where nitrogen is converted into ammonia and then quantified. The system typically consists of a digestion unit, a distillation unit, and titration equipment. In the digestion step, the sample is heated with concentrated sulfuric acid, causing the nitrogen to convert into ammonia. The ammonia is then released through steam distillation and collected in an acidic solution. Finally, the concentration of ammonia is determined by titration with a known solution. Labotronics Kjeldahl systems offer various automation levels, from manual to fully automated setups, streamlining the time-consuming and labor-intensive Kjeldahl process.

Graphite Kjeldahl Digester
Kjeldahl Distillation Unit

Sample type	Solid, Semi-solid and Liquid
Sample capacity	Solid: 0.2 to 2 g Semi-solid: 2 to 5 g Liquid: 10 to 25 ml
Measuring range	0.1 to 200 mg (N)
Recovery rate	≥99%

Digestion Tube Capacity	300 mL per tube
Batch Capacity	20 samples per batch
Temperature Range	RT +5°C to 450°C
Temperature Accuracy	± 1°C

Measuring range	0.1 mgN ~ 200 mgN (nitrogen content 0.1% - 99%).
Distillation speed (according to sample amount)	5 min/sample ~ 15 min/sample
Recovery rate (relative error, include digestion process)	≥ 99 %
Repetition rate	relative standard deviation < ± 1%

Digestion Capacity	20 positions
Digestion Tube Capacity	300 ml per tube
Temperature Range	RT +5°C to 400°C
Temperature Accuracy	± 1°C

Kjeldahl System

Graphite Kjeldahl Digester

Kjeldahl Distillation Unit

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