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IS0
I N T E R N AT I O NA L O R G A N IZAT I O N
FOR STAND AR D I Z AT I O N
I S O R E CO M M E N DATI O N
R 624
PULPS
EXTRACTION OF MATERIALS SOLUBLE
IN DICHLOROMETHANE
1st EDITION
October 1967
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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 I SO Recommendation R 624, Pulys-Extraction of materials soluble in dichloro-
merhane, was drawn up by Technical Committee ISO/TC 6, Paper, board and pulps, the
Secretariat of which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1963 and led, in 1965,
to the adoption of a Draft IS0 Recommendation.
In January 1966, this Draft IS0 Recommendation (No. 891) 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 Germany Romania
India
Australia South Africa,
Austria Iran
Rep. of
Belgiuni Israel Spain
Brazil Japan Sweden
Bulgaria Korea, Rep. of Switzerland
Canada Mexico Turkey
Chile Netherlands
U.A.R.
Czechoslovakia New Zealand United Kingdom
Finland Poland U.S.A.
France Portugal Yugoslavia
Two Member Bodies opposed the approval of the Draft:
Italy
Norway
The Draft IS0 Recoinmendation was then submitted by correspondence to the IS0
Council, which decided, in October 1967, to accept it as an IS0 RECOMMENDATION.
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I
IS0 / R 624 - l!M (E)
IS0 Recommendation R 624 Octo ber 1967
PULPS
EXTRACTION OF MATERIALS
SOLUBLE IN DICHLOROMETHANE
1. SCOPE
This IS0 Recommendation describes a method for the separation of pulp components soluble
in dichloromethane.
2. FIELD OF APPLICATION
This method may be used for all kinds of chemical and semi-chemical pulp (see Appendix X).
3. PRINCIPLE OF THE METHOD
The pulp is treated with dichloromethane (see Appendix Y) in a Soxhlet apparatus. After at
least 24 extraction cycles the solvent is evaporated and the residue is dried at a temperature of
103 3 2 "C for a period not exceeding 16 hours and subsequently weighed.
4. REAGENT
4.1 Dichloromethane, CH,Cl,, 98 to loo%, and with a dry matter content of less than 5 mg per
litre. The commercial product as a rule should be re-distilled. Collect the fraction distilling
over between 38 to 41 "C and store in a brown-glass bottle. The distillate should be neutral
(see Note, section 7).
5. APPARATUS
5.1 Extraction apparatus of Soxhlet type entirely made of glass with ground-in condenser,
extractor and flask. The capacity of the extractor should be 60 to 120 ml.
5.2 Adjustable heater.*
5.3 Drying oven, ventilated, capable of maintaining an air temperature of 103 & 2 OC.
5.4 Balance accurate to 0.5 mg.
6. PREPARATION OF SAMPLE
Cut or tear the air-dry pulp into pieces of about 1.5 cm x 1.5 cm, in sufficient quantity for
carrying out at least two determinations.
* e.g. electric heater, adjustabl
...