JJF 109-2012
Calibration Specification for Nitrogen Analyzer.
Metrological calibration of nitrogen analyzers — the specification against which instrument performance is verified.
Metrology institutes, inspection stations and manufacturers calibrating automatic nitrogen determination apparatus.
Method principle.
A calibration specification rather than a test method: it defines how a nitrogen analyzer's performance is verified and documented. Read the full Kjeldahl method note →
SONNEN’s role: Sonnen is listed in its published materials as one of the drafters of JJF 109-2012, the Calibration Specification for Nitrogen Analyzer.
Laboratory workflow.
Digestion
The sample is digested in concentrated sulphuric acid with a catalyst on a digestion block (Smart, X, S or Gr series), converting organic nitrogen to ammonium.
Distillation
Alkali is added and steam distillation releases the ammonia, which is absorbed in boric acid — automated on every K-series analyzer.
Titration
The absorbed ammonia is titrated to a colorimetric end point detected by a 16-bit tri-primary color sensor (built in on K06, K12, K18 and K1306; external on K1305/K1301).
Data handling
Results are calculated, stored and exported — K12/K18 store up to 5,000,000 test results with USB, Wi-Fi and host-control output; K18 adds LIMS connectivity.
Relevant SONNEN instruments.
FAQ.
What is SONNEN's role in JJF 109-2012?
Why does a calibration specification matter to buyers?
Working to JJF 109-2012?
Tell us your sample type — we will map the instrument to the method.