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UûC 665.1 17 : 620.1
IS0
I N TERN AT I ON A L O RG A N IZ AT1 O N FOR S TA N DA RD I ZATlO N
I SO R EC O M M EN DATI O N
R 735
OILSEED RESIDUES
DETERMINATION OF ASH INSOLUBLE IN
HYDROCHLORIC AC1 D
1st EDITION
May 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.
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BRIEF HISTORY
The IS0 Recommendation R 735, Oilseed residues. Determination of ash insoluble in hydro-
chloric acid, was drawn up by Technical Committee ISO/TC 34 - Agricultural food products, the
Secretariat of which is held by the Magyar Szabvanyügyi (MSZH).
Work on this question by the Technical Committee began in 1963 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
In October 1966, this Draft IS0 Recommendation (No. 1042) 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 Romania
Australia South Africa,
India
Brazil Rep. of
Iran
Bulgaria Israel Thailand
Czechoslovakia Italy Turkey
Chile Korea, Rep. of United Kingdom
Colombia Netherlands U.S.S.R.
France Poland Yugoslavia
Germany Portugal
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 May 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 735-1968 (E)
IS0 Recommendation R 735 May 1968
OILSEED RESIDUES
DETERMINATION OF ASH INSOLUBLE
HYDROCHLORIC ACID
1. SCOPE
This IS0 Recommendation describes a method for the determination of the ash insoluble in hydro-
chloric acid, from residues (excluding compounded products) obtained by the extraction of oil from
oiiseeds by pressure or solvent.
2. DEFINITION
By ash insoluble in hydrochloric acid is meant the fraction of the total ash which remains undissolved
after treatment with hydrochloric acid under the operating conditions described below.
3. PRINCIPLE
Treatment of the total ash with hydrochloric acid, to remove the portion soluble in this reagent, then
incineration and weighing of the insoluble residue.
4. REAGENTS
4.1 Hydrochloric acid, 3 N solution.
4.2 Silver nitrate solution, 1 g per 100 mi.
5. APPARATUS
5.1 Analytical balance.
5.2 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.
5.3 Hardened filter paper, of medium porosity, ash-free.
5.4 Electrically heated muffle furnace, with air circulation and provided with means for automatic
temperature control.
5.5 Desiccator, containing an efficient desiccant.
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ISOlR 735-1968 /E
6. PROCEDURE
Carry out all weighmgs to the nearest 0.001 g.
6.1 Test portion
Use the total ash obtained in the determination of total ash as described in IS0 Recommend-
ation R 149, Oilseed residues - Determination of total ash.
6.2 Determination
Moisten the total ash with 1 O ml of the hydrochloric acid solution (4.1) covering the incineration
dish (5.2) with a watch-glass. Heat gently and, by several washes with hydrochloric acid solution
(4.1) using about 50 ml of acid solution in all, transfer the contents of the dish to a be
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