|
IS0
I NTERN AT1 O N A L O RG A N IZAT I ON FOR STA N DARD IZATl ON
IS0 RECOMMENDATION
R 749
OILSEED RESIDUES
DETERMINATION OF TOTAL ASH
1st EDITION
June 1968
COPY RIGHT 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 749, Oilseed residues - Determination of total ash, was drawn up
by Technical Committee ISO/TC 34, Agricultural food products, the Secretariat of which is held by
the Magyar Szabvinyügyi Hivatal (MSZH).
Work on this question by the Technical Committee began in 1963 and led, in 1965, to the
L
adoption of a Draft IS0 Recommendation.
In October 1966, this Draft IS0 Recommendation (No. 1017) 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 :
Australia India Portugal
Brazil Iran Romania
Bulgaria Ireland South Africa,
Chile Israel Rep. of
Colombia Italy Thailand
Czechoslovakia Korea, Rep. of Turkey
United Kingdom
France Netherlands
Germany U.S.S.R.
Paraguay
Hungary Poland Yugoslavia
One Member Body opposed the approval of the Draft
Canada
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in June 1968, to accept it as an IS0 RECOMMENDATION.
-3-
---------------------- Page: 2 ----------------------
ISO/R 749-1968 (E)
IS0 Recommendation R 749 June 1968
OILSEED RESIDUES
DETERMINATION OF TOTAL ASH
1. SCOPE
This IS0 Recommendation describes a method for the determination of the total ash from residues
(excluding compounded products) obtained by the extraction of oil from oilseeds by pressure or
solvent.
2. DELlNIïïON
By total ash is meant the residue obtained after incineration at 550 f 15 OC under the operating con-
ditions described below.
3. PRINCIPLE
Incineration of the product at 550 f 15 "C in an electrically heated muffle furnace, to practically con-
stant mass.
4. APPARATUS
4.1 Analytical balance.
4.2 Mechanical mill, easy to clean and allowing the residues to be ground without heating and with-
out appreciable change in the content of moisture, volatile matter and oil, to particles passing
completely through a sieve of aperture diameter 1 mm.
4.3 Sieve, with apertures of 1 mm in diameter.
4.4 Flat-bottomed incineration dish, of diameter about 60 mm and height not exceeding 25 mm, of
platinum, platinum-plated gold, quartz or, if not available, porcelain.
4.5 Electrically heated muffle furnace, with air circulation and provided with means for automatic
temperature control.
4.6
Desiccator, containing an efficient desiccant.
5. PROCEDURE
Carry out all weighmgs to the nearest 0.001 g.
5.1 Preparation of the sample
5.1.1 Use the contract sample obtained as described in IS0 Recommendation R .,* Oilseed resi-
dues - Sampling.
*
At present at the stage of a draft proposal.
-5-
---------------------- Page: 3 ----------------------
ISO/R 749-1968 (I
5.1.2 Grind the contract sample, if necessary, in the previously well cleaned mechanical mill (4.2).
Use about a twentieth of the sample to complete the cleaning of the mill, and reject these
grindings; grind the rest, collect the grindings, mix carefully and carry out the analysis with-
out delay.
5.2 Test portion
5.2.1 Weigh the incineration dish (4.4), previously heated for 15 minutes in the electric muffle
furnace (4.5) at 550 ? 15 "C and cooled again in the desiccator (4.6) to laboratory temper-
ature
5.2.2 Put into the incineration dish about 5 g
...