Control - Determination of total nitrogen and non protein nitrogen in milk - 2025

Standard Reference Materials

Home Standard Reference Materials Physico-chemistry - Control - Determination of total nitrogen and non protein nitrogen in milk - 2025

Purpose

control of the Kjeldahl method or the Dumas method.


Nature of SRMs

→ Tryptophan solutions (for controlling the digestion step, Kjeldahl method).
→ Ammonium sulphate solutions (for testing the distillation and titration step, Kjeldahl method)
→ Whole homogenised UHT milk samples (for testing the global accuracy on the routinely analysed product).


Preservation

the two solutions contain no preservative

Addition of Bronopol to the milk samples (final concentration: 0.02 %)


Packaging

in 30 ml screw-capped vials with airtight seals


Dispatch

monthly and on request (subject to availability), in insulated box with ice packs by express carrier (see regulation for shipping times)

For an order without annual subscription, send your order form before 3 p.m., otherwise packages can be sent the following day (valid from Monday to Wednesday) (except for countries outside UE - Outside EU, time before dispatch may take up 7 days, the time necessary to obtain customs documents)


Standard values

- solutions: true values

- milk: determined by the results of a group of expert laboratories, for total nitrogen (TN) and non protein nitrogen (NPN) (ISO 8968-1 and 4|IDF 20-1 and 4


Calendar of dispatch :

 

Month of dispatch Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
Week 1 5 9 14 18 22 27 31 35 40 44 48

Rates

Annual subscription Without subscription
Subscription
(12 shipments / year)
For each extra group every month "extra dispatch in the course of the year (per group) Per group
Set no. 1 : without NPN determination 451.39 € 106.36 € 37.4 € 50.5 €
Set no. 2 : with NPN determination 599.35 € 155.87 € 49.74 € 69 €
Set no. 3 : without NPN determination 451.39 € 106.36 € 37.4 € 50.5 €
Set no. 4 : with NPN determination 599.35 € 155.87 € 49.74 € 69 €
Set no. 5 451.39 € 106.36 € 37.4 € 50.5 €
Set no. 6 451.39 € 106.36 € 37.4 € 50.5 €


Payment conditions :

within 1 month of receiving invoice

Formulas

  • Set no. 1 : without NPN determination
  • Set no. 2 : with NPN determination
  • Set no. 3 : without NPN determination
  • Set no. 4 : with NPN determination
  • Set no. 5
  • Set no. 6




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ACTALIA Cecalait

Rue de Versailles
BP 70129
39801 POLIGNY CEDEX
FRANCE

Tel : +33 (0)3 84 73 63 20
Fax : +33 (0)3 84 73 63 29

cecalait[at]actalia.eu

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