|
UDC 665.3 : 620.1
IS0
FOR STAN D AR0 IZATl O N
I N T E R N AT I O N A L O R G A N 1 Z AT 1 ON
IS0 RECOMMEN DATION
R 663
CRUDE VEGETABLE OILS AND FATS
DETERMINATION OF INSOLUBLE IMPU R IT1 ES
1st EDITION
February 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The IS0 Recommendation R 663, Chde vegetable oils and fats - Determination of insoluble
impurities, was drawn up by Technical Committee ISO/TC 34, Agricultural food products, the
Secretariat of which is held by the Magyar Szabvhnyügyi Hivatal (MSZH).
Work on this question by the Technical Committee led in 1963, to the adoption of a Draft
IS0 Recommendation.
L
In March 1966, this Draft IS0 Recommendation (No. 905) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by
the following Member Bodies :
Argentina Hungary Romaina
South Africa,
Australia India
Rep. of
Belgium Iran
Ireland Turkey
Bulgaria
U.A.R.
Chile Israel
Italy United Kingdom
Colombia
Netherlands U.S.S.R.
Czechoslovakia
Finland New Zealand Yugoslavia
France Norway
Germany Poland
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council
which decided, in February 1968, to accept it as an IS0 RECOMMENDATION.
4
-3-
---------------------- Page: 2 ----------------------
ISO/R 663-1968 (I
IS0 Recommendation R 663 February 1968
CRUDE VEGETABLE OILS AND FATS
DETERMINATION OF INSOLUBLE IMPURITIES
1. SCOPE
This IS0 Recommendation describes a method for the determination, in crude vegetable oils and
fats, of insoluble impurities.
L
2. DEFINITION
By insoluble impurities is meant the dirt and other foreign matter, expressed as a percentage by
mass, which are insoluble in n-hexane or light petroleum under the conditions specified.
These include mechanical impurities, minerai substances, carbohydrates, nitrogenous substances,
various resins, calcium soaps, oxidized fatty acids lactones, and (in part) alkali soaps, hydroxy-fatty
acids and their glycerides. .
3. PRINCIPLE
Treatment of the material with an excess of n-hexane or light petroleum, filtration of the solution,
washing of the filtering system with the same solvent, drying at 103 f 2 "C and weighing of the
filtering system and dry residue.
4. REAGENT
n-Hexane; failing this, light petroleum distilling between 40 and 60 "C and having a bromine value
below 1. For either solvent the residue on complete evaporation should not exceed 0.002 g/100 ml.*
5. APPARATUS
5.1 Electric oven, with temperature regulation.
5.2 Analytical balance.
Metal vessel, (preferably of aluminium), or glass vessel with a well fitting cover.
5.3
Desiccator, containing an efficient desiccant, such as phosphorus pentoxide, silica gel, activated
5.4
alumina, etc.
*
This IS0 Recommendation has been prepared in the context of food products, and the choice of solvent has
been limited for this reason.
-5-
-------------
...