The
NDA 702 elemental analyzer for nitrogen and protein determination works according to the
Dumas combustion method.
The
Dumas method, also known as the combustion method, is a primary method of
Nitrogen and Protein determination that provides rapid results, ease of use, and safety.
It is often considered an alternative to the classical Kjeldahl method. This is because different international organizations validate both methods: Kjeldahl is officially recognized by AOAC, EPA, DIN, ISO, etc., while Dumas is by AOAC, AACC, ISO, DIN, ASBC, AOCS, OIV, etc. However, in some countries, local guidelines recommend one method over the other.
This is why many decision-makers and users are undecided between the two methods and following local guidelines or international standards.
OFFICIAL REFERENCE METHODS FOR THE FOOD INDUSTRY
| INDUSTRY |
REFERENCE OFFICIAL METHODS |
DESCRIPTION |
|
Food
|
AOCS Ba 4e-93
|
Generic Combustion Method for Crude Protein |
|
Cereals, pasta, oilseeds, plants e nuts
|
AOAC 992.23
|
Crude protein in cereal grains - General combustion method |
|
AACC 46-30
|
Crude protein- Combustion method (all flours, cereal grains, oilseeds, animal feeds) |
|
ISO 16634-1:2008
|
Food products - Determination of the total nitrogen content by combustion according to the Dumas principle and calculation of the crude protein content — Part 1: Oilseeds and animal feeding stuffs |
|
ISO/TS 16634-2:2009
|
Food products - Determination of the total nitrogen content by combustion according to the Dumas principle and calculation of the crude protein content — Part 2: Cereals, pulses and milled cereal products |
|
ICC 167
|
International Association for Cereal Chemistry. Determination of crude protein in grain and grain products for food and feed by the Dumas Combustion Principle |
|
Barley
|
ASBC Barley 7C
|
AMERICAN SOCIETY OF BREWING CHEMISTS Barley |
|
Soy
|
AOCS Ba 4f-00
|
Combustion Method for Crude Protein in Soybean Meal |
|
Meet and meet products
|
AOAC 992.15
|
Crude Protein in Meat and meat products Including Pet Foods |
|
Beer and must
|
ASBC AOAC 997.09
|
Nitrogen in Beer, Wort, and Brewing Grains Protein (Total) by Calculation |
|
Milk and dairy products (cheese, milk powder, probiotic, drinks, yogurt, butter)
|
UNI EN ISO 14891, (FIL-IDF 185, 2008)
|
Milk and milk products - Determination of nitrogen content - Routine method using combustion according to the Dumas principle. |
|
Wine
|
OIV-MA-AS323-02A
|
Quantification of total nitrogen according to the Dumas method (Musts and Wines) Type II method |
OFFICIAL REFERENCE METHODS FOR THE FEED INDUSTRY
| INDUSTRY |
REFERENCE OFFICIAL METHODS |
DESCRIPTION |
| Feed and pet food |
AOAC 990.03 |
Protein (Crude) in Animal Feed Combustion Method |
OFFICIAL REFERENCE METHODS FOR THE AGRICULTURE
| INDUSTRY |
REFERENCE OFFICIAL METHODS |
DESCRIPTION |
| Fertilizers |
AOAC 993.13 |
Nitrogen (Total) in Fertilizers |
OFFICIAL REFERENCE METHODS FOR THE ENVIRONMENTAL INDUSTRY
| INDUSTRY |
REFERENCE OFFICIAL METHODS |
DESCRIPTION |
| Soil, Sludge, biowaste |
ISO 13878:1998 |
Soil quality -- Determination of total nitrogen content by dry combustion ("elemental analysis") |
| EN 16168: 2012 |
Sludge, treated biowaste and soil. Determination of total nitrogen using dry combustion method |
OFFICIAL REFERENCE METHODS FOR THE CHEMICAL INDUSTRY
| INDUSTRY |
REFERENCE OFFICIAL METHODS |
DESCRIPTION |
| Cellulose nitrate |
STANAG No. 4178 |
Military standardization agreement |
| Tyre rubber (ABS, SAN) |
ISO TC 45/SC 2 N2 116 |
Raw materials (including latex) for use in the rubber industry. Rubber, raw, latex - Determination of nitrogen content by Dumas Combustion method |
| Engine oils |
ISO 22241-2 |
Diesel engines — NOx reduction agent AUS 32 – Annex B: Determination of urea content by total nitrogen |