ISO 605:1991 pdf download – Pulses – Determination of impurities, size, foreign odours, insects, and species and variety – Test methods
1 Scope
This International Standard specifies methods not given in other international Standards for testing pulses which have not been processed and which are intended for human consumption or for animal feeding stuffs.
2 Normative reference
The following Standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the edition indicated was valid. All Standards are subject to revision, and Parties to agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent edition of the Standard indicated below. Members of IEC and ISO maintain registers of cur- rently valid International Standards.
ISO 951:1 979, Pulses in bags – Sampling.
7.1 .1 Carry out the examination described in 7.1.2 or 7.1.3 (a rapid sensitive method) as soon as poss- ible after sampling.
7.1 .2 Spread out the Sample and smell it. If no strong foreign odour .is detected, return the Sample to the Container and seal it, leave it for 24 h and then re-examine the Sample. The Sample may be further examined during or after grinding. If, after these operations, no foreign odour tan be detected with certainty, put about 3 g to 5 g of the ground Sample into a flask of 50 ml to 100 ml ca- pacity. Examine the ground Sample heated to a temperature not higher than 60 ‘C by cautiously moving the open flask over a flame or repeatedly shaking it and immersing it in a water-bath.
7.1.3 Put a small quantity of the ground or un- ground product in a beaker, pour in some warm water (60 “C to 70 OC) and cover the beaker. After 2 min to 3 min decant the water, and note whether foreign odours are present.
8.1.1 Procedure
Spread out part of the laboratory Sample on a warm plate (about 40 “C) and cover immediately with a bell jar in Order to prevent the escape of insects. NOTE 2 In warm climates it may be advisable to cool the Sample and then to sieve it quickly using a sieve of aperture size appropriate to the Sample and through which the smaller insects will pass. The adult insects tan easily be collected in a test tube and, if it is desired to know whether living insects are present, the closed test tube tan be warmed for a few minutes by hand. If no living insects are observed within 15 min, open if possible 100 obviously infested seeds to check the possible presence of living or dead insects and Iarvae. Examine the Sample also for webbing prod- uced by the Iarvae of the house moth and related species.
9.1.2 Chemical method Soak the selected seeds in water at room tempera- ture for 3 h. The test tan be accelerated by boiling the seeds for 20 min instead of soaking them. If the swelling of the seeds proceeds slowly, extend the period of soaking or boiling as necessary. Score the seed coats of seeds that do not swell. When the seeds have swollen, decant the water and place the seeds in a glass vessel containing a potassium carbonate solution or a 50 g/l sodium hydroxide Solution. After 5 min to IO min, a dark discoloration (brown or black) tan be observed on the rogues or on their hilum, whereas the harvest peas do not Change in colour.