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UDC 633.3 : 620.113
IS0
FO R STAN D AR0 IZATl O N
I NTERN AT1 O N A L O RG A N IZAT I ON
IS0 RECOMMENDATION
R 951
PULSES
SAMPLING
1 st EDITION
January 1969
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 95 1, Pulses - Sampling, was drawn up by Technical Committee ISO/TC 34,
Agricultural food producls, the Secretariat of which is held by the Magyar Szabvinyügyi Hivatal (MSZH).
Work on this question led, in 1966, to the adoption of a Draft IS0 Recommendation.
In September 1967, this Draft 1SO Recommendation (No. 1335) 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
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Member Bodies :
Australia Hungary Portugal
Brazil India Romania
Chile Iran Thailand
Czechoslovakia Israel Turkey
France Netherlands U.A.R.
Germany Poland United Kingdom
One Member Body opposed the approval of the Draft
U.S.S.R.
The Draft IS0 Recommendation was then submitted by correspondence to the 1SO Council, which
decided, in January 1969, to accept it as an IS0 RECOMMENDATION.
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ISO/R 951 -1969 (E)
IS0 Recommendation R 951 January 1969
PULSES
SAMP L I NG
INTRODUCTION
Correct sampling is an operation that requires most careful attention. Emphasis cannot therefore be too strongly
laid on the necessity of obtaining a properly representative sample of pulse. Careless or inaccurate sampling
could lead to misunderstanding and unwarranted financial adjustments.
The procedures given in this IS0 Recommendation are recognized as good practice and it is strongly recommended
that they be followed whenever practicable. It is recognized that it is difficult to lay down fixed rules to be
followed in every case, and particular circumstances may render some modification of the method desirable,
for example if it is desired to check the uniformity of a consignment by the examination of individual priniary
samples.
In certain areas there are widely recognized trade associations which prescribe rules for the sampling procedures
to be used in contracts under their auspices. In no case will this IS0 Recommendation override the rules laid
down in such contracts.
Pulses are usually transported in bags, and this document does not cover sampling from bulk consignments, for
which the general rules given in IS0 Recommendation R 950, Cereals - Sampling (as grain), are applicable.
1. SCOPE
1.1 This IS0 Recommendation specifies general conditions relating to sampling for assessment of the quality
of pulses transported in bags.
1.2 Field of application
This IS0 Recommendation does not apply to pulses intended for sowing.
2. DEFINITIONS
Terms used in this document have the following definitions.
2.1 Consignment. The quantity of pulse dispatched or received at one time and covered by a particular
contract or shipping document.
Lot. A stated portion of the consignment which will allow the quality to be assessed
2.2
2.3 Primary sample. A small quantity of pulse taken from a single position in the lot.
A series of primary samples should be drawn, from different positions in the lot. which when bulked will
be representative of the lot.
2.4 Bulk sample. The quantity of pulse formed by combining and mixing the primary samples drawn from any
one particular lot.
Final lot sample (laboratory sample). A sample representing the quality of the lot, obtained by reduction
2.5
of the bulk saniple and intended for analysis or other examination.
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ISOlR 951-1969 (E)
3. GENERAL
3.1 Samples should be drawn jointly by sampling superintendents appointed by buyers and sellers or by a
sampling superintendent appointed jointly.
3.2 Samples should be fully representative of the lots from which they are drawn. Therefore, as the composition
of the lot is seldom uniform, a sufficient number of primary samples should be drawn and carefully mixed,
thus giving a bulk sample from which are obtained, by successive divisions, the final lot samples.
3.3 It is essential that pulse which is sea-damaged or otherwise damaged in transit or out of condition should be
kept separate from sound pulse and sampled separately. Samples of unsound material should not be mixed
with samples of the sound material.
3.4 Special care is necessary to ensure that all sampling apparatus is clean, dry and free from foreign odours.
Sampling should be carried out in such a manner as to protect the samples, the sampling instruments and
the containers in which the samples are placed from adventitious contamination such as rain, dust, etc.
4. APPARATUS
The apparatus required falls under the following headings. Examples are given under each heading. (See also
Fig. 1 to 7 of Annex A.)
4.1 Sampling
Sack-type spears or triers.
4.2 Mixing and dividing
Shovels and dividing apparatus, preferably of wood or plastics material
5. LOCATION OF SAMPLING
The location and time of sampling should be determined by the agreements between the parties concerned.
Particular recommendations applying to loading and discharge of the bags are given below.
5.1 Loading
It is important that pulse which is to be dispatched by vessel should be sampled during loading of the
bags, or immediately before, at the place of loading.
5.2 Discharge
Most pulses are received from ocean-going vessels or river transport. In both cases, sampling should be
carried out during discharge of the bags from the vessel.
6. METHOD OF DRAWING SAMPLES
6.1 Size of lot
Consignments should be considered in lots of 200 tonnes*, or such part thereof as constitutes a single
consignment or balance.
* Metric tonnes. ! t = 1000 kg
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ISO/R 951 -1969 (f
6.2
Number of bags
in consignment to be sampled
I lip to 10 I Each bag
I
10 to 100 10, drawn at random
Square root (approximately) of
More than 100
total number, drawn according to
a suitable sampling scheme*
6.3 Bulk sample
The bulk sample should be formed by bringing together the primary samples and mixing them well.
6.4 Final lot samples
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The bulk sample should be mixed and divided down to the required number of final lot samples by
use of the apparatus mentioned in section 4. The number of final lot samples to be drawn for analysis and
arbitration should be specified in the contract or otherwise agreed between buyer and seller.
6.5
Primary Bulk Final lot
Pulses Lot
sample sample sample
All types Up to 1.5 kg 150 kg 2.5 kg
200 tonnes (ma.) (max.)
Larger samples may be necessary in certain cases, for example. if it is necessary to examine the pulse for
infestation.
PACKAGING AND LABELLING OF SAMPLES
7.
W
Packaging of samples
7.1
7.1.1 The final lot samples should be packed in unglazed, unbleached, insewn, cotton bag
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