6639/2 nternational Standard (ISO) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAR OPFAHM3AUMA NO CTAHAAPTM3ALWMORGANISATION INTE RNATIONALE DE NORMALISATION Cereals and pulses - Determination of hidden insect infestation Part 2: Sampling Ceréales et legumineuses -- Détermination de I'infestation cachee par les insectes -- Partie 2: Echantillonnage First edition - 1986-12-01 UDC 633.1 : 635.65 : 632.7 Ref.No.ISO6639/2-1986 (E) ISO6639/2-1986 Descriptors: agricultural products, cereal products, leguminous grains, tests, determination, insects, contamination, sampling. Price based on 4pages n for Standardization No reproduction or networking permited without license from IHS Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with iSO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6639/2 was prepared by Technical Committee ISO/TC 34, Agricultural foodproducts. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1986 Printed in Switzerland CopyrhenatioaOganizationforStandadizatio No reproduction or networking permitted without license from IHS Not for Resale ISO 6639/2-1986 (E) INTERNATIONAL STANDARD Cereals and pulses - Determination of hidden insect infestation - Part 2: Sampling O Introduction sampling, whichever is the more convenient. If the consignment is received in several barges, raitway waggons, lorries, stacks, etc., it is This International Standard describes methods of determining usually more convenient to treat each part as a separate lot for hidden insect infestation in cereals and pulses. It consists of the sampling purposes. Any parts of a consignment known to be of following parts : different origin and/or history are sampled as separate lots. Part 1: General principles. It should be noted that the definition of "lot" for the purposes of sampling for determination of hidden insect infestation differs from the Part 2: Sampling. grain and pulses for the determination of other characteristics. Part3:Referencemethod. Part4:Rapidmethods. 3.3 increment : A small quantity of grain taken from a single position in the lot. Scope and field of application 3.4 bulk sample: The quantity of grain obtained by com- This part of ISo 6639 specifies methods of sampling cereals bining and mixing the increments taken from a specific lot. and pulses, in bags or in bulk, for the determination of hidden insectinfestation. 3.5 laboratory sample : The quantity of grain removed from The methods are applicable as a routine to grain in any form of the bulk sample, or an increment (see 10.1), intended for store or vehicle at any level of trade from producer to examination. consumer. 2 References General principles Iso 950, Cereals - Sampling (as grain). NOTE Usually there is little or no prior information on the size or distribution of any insect population that may be present in a lot to be Iso951, Pulses in bags - Sampling. sampled. In these circumstances, it is not possible to adopt a sampling scheme which is soundly based on statistical theory. Therefore, sampling schemes described in this part o