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AOAC - EN ISO - ASBC - ICC - AACC - REG CE - DIN EN - EPA - APAT - ASTM Nitrogen/Protein Determination - Kjeldahl Distillation Units

The Distillation Units for the VELP UDK Series work according to the official Kjeldahl method.

The Kjeldahl Method is approved by all the essential Official Analytical Worldwide Bodies and Organizations such as AOAC, ISO, EPA, DIN, ASTM, and many others.

The Kjeldahl Method covers many industrial sectors for Nitrogen/Protein Determination and Nitric nitrogen determination, Phenols, Volatile acids, Cyanides, Alcohol determination, and Devarda alloy.

Here is a list of official references according to which the UDK Series works.
 
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FOOD & BEVERAGE OFFICIAL REFERENCE METHODS

INDUSTRY OFFICIAL REFERENCE METHOD DESCRIPTION
Milk and dairy product AOAC 991.20 Nitrogen (Total) in Milk
IDF 20, ISO 8968 Milk - Determination of nitrogen content
Nut products (almonds, nuts, hazelnuts, coconuts) AOAC 950.48 Protein (Crude) in Nuts and Nut Products
Beer AOAC 920.53 Protein in Beer
Barley malt AOAC 950.09 Protein in Malt
ASBC Barley 7A AMERICAN SOCIETY OF BREWING CHEMISTS Barley
Cereals AOAC 979.09 Protein in grains
AACC 46.11.02 Crude Protein -- Improved Kjeldahl Method, Copper Catalyst Modification
ICC standard method 105-2 Determination of Crude Protein in Cereals and Cereal Products for Food and Feed
Soya beans and lupins AOAC 920.87 Protein (Total) in Flour
Meat and meat products AOAC 981.10 Crude Protein in Meat
Bread and baked products AOAC 950.36 Protein in Bread
Compressed and granular yeast AOAC 962.10 Protein in Dried Yeast
Sugar, syrup, molasses AOAC 945.23 Protein in Brewing Sugars and Syrups
Wheat spaghetti and macaroni, egg pasta AOAC 930.25 Protein in Macaroni Products
TVB-N Total Volatile Basic Nitrogen Conway and Byrne's method Conway and Byrne's method
REG CE 2074/2005  
Wine-Alcohol strength OIV Method - MA - AS312 - 01A Alcoholic strength by volume
Spirits drinks -Alcohol strength REG CE 2870/2000 Alcoholic Strength in Spirits Drinks
Sulphite AOAC 990.28 Sulfites in Foods - Optimized Monier-Williams Method
Formaldehyde AOAC 964.21 Formaldehyde in Maple Syrup
Volatile acidity of tomato paste REG CE 1764/86 Minimum quality requirements for tomato-based products eligible for production aid
Volatile acidity of the wine REG CE 2676/90 Methods for the analyses in the wine sector
 

FEED OFFICIAL REFERENCE METHODS

 
INDUSTRY OFFICIAL REFERENCE METHOD AND APPLICATION DESCRIPTION
Animal feed and pet food AOAC 984.13 Protein (Crude) in Animal Feed and Pet Food
AOAC 2001.11 Protein (Crude) in Animal Feed, Forage (Plant Tissue), Grain, and Oilseeds
REG CE 152/2009 Methods for sampling and analysis for official controls on feed
EN ISO 5983-2:2009 Animal feeding stuff — Determination of nitrogen content and calculation of crude protein content
Part 2: Block digestion and steam distillation method
 

AGRICULTURE OFFICIAL REFERENCE METHODS

 
INDUSTRY OFFICIAL REFERENCE METHOD AND APPLICATION DESCRIPTION
Plants (vegetable), forage and straw AOAC 978.04 Nitrogen (Total) (Crude Protein) in Plants
Urea ISO 1592 Urea — Determination of nitrogen content — Titrimetric method after distillation
Urea nitrogen in feed and roughage AOAC 941.04 Urea Ammoniacal Nitrogen in Animal Feed
Fertilizers AOAC 920.03 Nitrogen (Ammoniacal) in Fertilizers
AOAC 955.04 Nitrogen (Total) in Fertilizers

ENVIRONMENTAL OFFICIAL REFERENCE METHODS

 
INDUSTRY OFFICIAL REFERENCE METHODS AND APPLICATION DESCRIPTION
Total nitrogen in water AOAC 973.48 Nitrogen (Total) in Water
EPA 351.3 Nitrogen, Kjeldahl Total (Colorimetric; Titrimetric; Potentiometric)
DIN EN 25663 Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium
ISO 5663-1984 Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium
Ammonia Nitrogen in water ISO 5664 Water quality — Determination of ammonium — Distillation and titration method
Phenols in water APAT CNR IRSA 5070 A1 Phenols (spectrophotometric with 4-amino antipyrine after extraction)
EPA 9065 Phenolic (spectrophotometric, manual 4-AAP with distillation)
ISO 6439:1990 Water quality — Determination of phenol index — 4-Aminoantipyrine spectrometric methods after distillation
Cyanide in water EPA 9010 Total cyanide: distillation
Standard Method 4500 4500-CN− Cyanide (2017)
APAT IRSA 4070 Cyanide
Soil Methods of soil analysis part 2 Chemical and microbiological properties, 2a ed.
Nitric Nitrogen (Devarda’s method) ISO 10048 Water quality — Determination of nitrogen — Catalytic digestion after reduction with Devarda's alloy
EN ISO 15476:2009 Fertilizers - Determination of nitric and ammoniacal nitrogen according to Devarda
AOAC 892.01 Nitrogen (Ammoniacal and Nitrate) in Fertilizers
EPA 1690 Ammonia-N in Water and Biosolids by Automated Colorimetry with Preliminary Distillation
APAT IRSA 4030 C Ammonia N
Standard Method 4500 NH3 4500-NH3 nitrogen (ammonia) (2017)

CHEMICAL & PETROCHEMICAL OFFICIAL REFERENCE METHODS

 

INDUSTRY

OFFICIAL REFERENCE METHOD AND APPLICATION

DESCRIPTION

Engine oils, Crude oil, fuels

ASTM D 3228

NTotal Nitrogen in Lubricating Oils and Fuel Oils by Modified Kjeldahl Method

ISO 333:1996

Coal. Determination of nitrogen semi-micro Kjeldahl method

ABS, SAN, rubber

ISO 1656:2019 Rubber, raw natural, and rubber latex, natural — Determination of nitrogen content
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