SIST EN ISO 24333:2010
(Main)Cereals and cereal products - Sampling (ISO 24333:2009)
Cereals and cereal products - Sampling (ISO 24333:2009)
This International Standard specifies requirements for the dynamic or static sampling, by manual or mechanical means, of cereals and cereal products, for assessment of their quality and condition. It is applicable to sampling for the determination of heterogeneously distributed contaminants, undesirable substances, and parameters usually homogeneously distributed like those used to assess quality or compliance with specification. It can be used to determine insects in a grain lot.
Getreide und Getreideerzeugnisse - Probenahme (ISO 24333:2009)
Diese Internationale Norm giltist für die dynamische oder statische Probenahme von Getreide und Getreide¬erzeugnissen mit manuellen oder mechanischen Mitteln zwecks Einschätzung der Qualität und Beschaffen¬heit anwendbar. Sie ist geeignet für statische Schüttgüter mit einer Tiefe von bis zu 9 m. Getreideschüttgüter mit einer Tiefe von mehr als 9 m sollten im fließenden Getreidestrom beprobt werden.
Diese Norm ist für die Probenahme zur Bestimmung von heterogen verteilten Kontaminanten, unerwünschten Substanzen und Parametern anwendbar, um die Qualität oder die Übereinstimmung mit der Spezifikation zu bewerten.
Diese Norm kann für den Nachweis von Insekten in einer Getreidepartie angewendet werden, es ist aber ratsam, den Befallsdruck während der Getreidelagerung durch geeignete Maßnahmen wie das Aufstellen von Fallen zu beurteilen.
Diese Norm ist nicht für Saatgetreide oder gentechnisch veränderte Organismen (GVO) geeignet.
ANMERKUNG 1 Die Probenahme von Saatgetreide wird durch Regeln der ISTA (International Seed Testing Association) abgedeckt.
ANMERKUNG 2 Zum Zeitpunkt der Veröffentlichung gibt es keine Studie, die die Einbeziehung von GVO in den Anwendungsbereich dieser Norm unterstützt.
Céréales et produits céréaliers - Échantillonnage (ISO 24333:2009)
L'ISO 24333:2009 spécifie des exigences relatives à l'échantillonnage dynamique ou statique, par des moyens manuels ou mécaniques, des céréales et produits céréaliers, en vue de l'évaluation de leur qualité et de leur état.
Elle est applicable à l'échantillonnage réalisé en vue de la détermination de contaminants répartis de façon hétérogène, de substances indésirables et de paramètres généralement répartis de façon homogène comme ceux utilisés pour évaluer la qualité ou la conformité à une spécification.
Elle peut être utilisée afin de déterminer l'infestation par des insectes d'un lot de grains.
Elle est applicable à l'échantillonnage réalisé en vue de l'évaluation de la qualité et de l'état des lots d'organismes génétiquement modifiés (OGM) mais n'est pas appropriée pour déterminer la présence fortuite d'organismes génétiquement modifiés dans des produits non génétiquement modifiés.
Elle n'est pas applicable aux semences.
Žito in žitni proizvodi - Vzorčenje (ISO 24333:2009)
Ta mednarodni standard določa zahteve za dinamično ali statično, ročno ali mehansko vzorčenje žita in žitnih proizvodov za ocenjevanje njihove kakovosti in stanja. Velja za vzorčenje pri določevanju heterogeno razporejenih onesnaževalcev, neželenih snovi in parametrov, ki so običajno homogeno razporejeni, kot so parametri, ki se uporabljajo za ocenjevanje kakovosti ali skladnosti s specifikacijo. Lahko se uporablja za določevanje žuželk v lotu zrn.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Getreide und Getreideerzeugnisse - Probenahme (ISO 24333:2009)Céréales et produits céréaliers - Échantillonnage (ISO 24333:2009)Cereals and cereal products - Sampling (ISO 24333:2009)67.060QMLKCereals, pulses and derived productsICS:Ta slovenski standard je istoveten z:EN ISO 24333:2009SIST EN ISO 24333:2010en,fr,de01-marec-2010SIST EN ISO 24333:2010SLOVENSKI
STANDARD
SIST EN ISO 24333:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 24333
December 2009 ICS 67.060 English Version
Cereals and cereal products - Sampling (ISO 24333:2009)
Céréales et produits céréaliers - Échantillonnage (ISO 24333:2009)
Getreide und Getreideerzeugnisse - Probenahme (ISO 24333:2009) This European Standard was approved by CEN on 11 December 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 24333:2009: ESIST EN ISO 24333:2010
EN ISO 24333:2009 (E) 2 Contents Page Foreword .3SIST EN ISO 24333:2010
EN ISO 24333:2009 (E) 3 Foreword This document (EN ISO 24333:2009) has been prepared by Technical Committee ISO/TC 34 "Food products" in collaboration with Technical Committee CEN/TC 338 “Cereal and cereal products”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2010, and conflicting national standards shall be withdrawn at the latest by June 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 24333:2009 has been approved by CEN as a EN ISO 24333:2009 without any modification.
SIST EN ISO 24333:2010
SIST EN ISO 24333:2010
Reference numberISO 24333:2009(E)© ISO 2009
INTERNATIONAL STANDARD ISO24333First edition2009-12-15Cereals and cereal products — SamplingCéréales et produits céréaliers — Échantillonnage
SIST EN ISO 24333:2010
ISO 24333:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
©
ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel.
+ 41 22 749 01 11 Fax
+ 41 22 749 09 47 E-mail
copyright@iso.org Web
www.iso.org Published in Switzerland
ii © ISO 2009 – All rights reserved
SIST EN ISO 24333:2010
ISO 24333:2009(E) © ISO 2009 – All rights reserved iii Contents Page Foreword.iv Introduction.v 1 Scope.1 2 Terms and definitions.1 3 General requirements.2 4 Equipment and devices.3 5 Sampling.3 5.1 General.3 5.2 Sampling of bulk products.3 5.3 Sampling of milled and other cereal products in packed units.8 6 Laboratory sample.11 6.1 Homogenization.11 6.2 Division of the aggregate sample.11 7 Packaging and labelling of samples.12 7.1 General.12 7.2 Labels for samples.12 8 Shipment of samples.13 9 Sampling report.13 10 Hygiene and safety.13 Annex A (informative)
Examples of mechanical sampling devices used on flowing grain.14 Annex B (informative)
Examples of instruments used to sample static products and instruments used to divide samples.18 Bibliography.28
SIST EN ISO 24333:2010
ISO 24333:2009(E) iv © ISO 2009 – All rights reserved 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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 24333 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 338, Cereal and cereal products, in collaboration with Technical Committee ISO/TC 34, Food products, Subcommittee SC 4, Cereals and pulses, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). This first edition of ISO 24333 cancels and replaces ISO 6644:2002[5] and ISO 13690:1999[7]. SIST EN ISO 24333:2010
ISO 24333:2009(E) © ISO 2009 – All rights reserved v Introduction Sampling is a procedure which requires both a method and equipment that are suitable for the task. Any analysis of the characteristics of a lot and any interpretation of the results would prove futile if the sample were not representative of the lot from which it was taken. Sampling is a procedure which requires a great deal of care. It is strongly recommended that the task be entrusted to personnel who have been trained to use the appropriate equipment.
SIST EN ISO 24333:2010
SIST EN ISO 24333:2010
INTERNATIONAL STANDARD ISO 24333:2009(E) © ISO 2009 – All rights reserved 1 Cereals and cereal products — Sampling 1 Scope This International Standard specifies requirements for the dynamic or static sampling, by manual or mechanical means, of cereals and cereal products, for assessment of their quality and condition. It is applicable to sampling for the determination of heterogeneously distributed contaminants, undesirable substances, and parameters usually homogeneously distributed like those used to assess quality or compliance with specification. It can be used to determine insects in a grain lot. NOTE 1 Other methods, e.g. trapping whilst grain is in storage, are more suitable to assess pest populations. It is applicable to sampling for assessment of the quality and condition of lots of genetically modified organisms (GMO) but is inappropriate for the determination of the presence of adventitious genetically modified material in non-GM product. It is not applicable to seed grain. NOTE 2 The sampling of seed grain is governed by the rules established by the ISTA (International Seed Testing Association). NOTE 3 At the time of publication, there is no study to support the inclusion of the sampling of non-GM product in order to determine adventitious GM presence within the scope of this International Standard. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 lot 〈cereals〉 identified quantity of material (cereal or cereal product) from which a sample can be taken and controlled to determine one (or several) characteristic(s) 2.2 sampling act of drawing or constituting a sample [ISO 3534-2:2006[3], 1.3.1] 2.3 increment 〈cereals〉 amount of material taken at one time at each individual sampling point throughout a lot NOTE Adapted from ISO 3534-2:2006[3], 5.2.7. SIST EN ISO 24333:2010
ISO 24333:2009(E) 2 © ISO 2009 – All rights reserved 2.4 aggregate sample composite sample 〈cereals〉 aggregation of two or more increments (2.3), taken by experimental sampling (2.2) throughout a lot (2.1), combined and homogenized NOTE Adapted from ISO 3534-2:2006[3], 5.3.4. 2.5 laboratory sample 〈cereals〉 sample prepared by homogenizing and dividing an aggregate sample (2.4) for sending to the laboratory and intended for inspection or testing NOTE Adapted from ISO 6206:1979[4], 3.2.10. 2.6 homogenization thorough blending by mechanical or manual means so that contaminants and physical properties are evenly distributed throughout the aggregate or laboratory sample 2.7 packed unit quantity of grain or milled product packed in a sack, a bag or a retail pack 2.8 sampling error 〈cereals〉 that part of total estimation of error of a characteristic due to the heterogeneity of the characteristics, the nature of sampling and to known and acceptable deficiencies in the sampling plan NOTE Adapted from ISO 7002:1986[6], A.42. 3 General requirements 3.1 In this International Standard, sampling includes the following stages: a) taking a defined number of increments to constitute an aggregate sample; b) homogenization of the aggregate sample; c) reduction of the aggregate sample into laboratory sample(s). 3.2 Since the composition of the lots of cereals is rarely homogeneous and since certain contaminants are distributed in a non-uniform way, a sufficient number of increments shall be taken and carefully mixed to constitute an aggregate sample from which it will subsequently be possible to obtain one or several laboratory sample(s). For non-flowing commodities (static), particular care shall be taken to ensure that these increments are distributed regularly throughout the grain mass, both at the surface and deep down. 3.3 Precautions shall be taken to ensure that all equipment used is clean, dry and free from foreign odours. The sampling procedures shall be carried out in such a way that the sampled material is protected from any source of accidental contamination caused by rain, dust, etc. 3.4 All the sampling procedures shall be carried out over a sufficiently short period of time to avoid any modification of the volatile substances in the samples. If one of the sampling stages takes a long time, the increments, individually or combined, shall be kept in sealed containers. SIST EN ISO 24333:2010
ISO 24333:2009(E) © ISO 2009 – All rights reserved 3 3.5 In the event of arbitration, samples shall be taken jointly by representatives of both the purchaser and the vendor, or by a third party nominated by common accord. 3.6 Precautions shall be taken to guarantee the integrity of all samples between the moment they are taken and the moment they are used in the laboratory. 4 Equipment and devices There are many different types of sampling equipment or devices. The most suitable equipment should be chosen taking into account the product to be sampled, the quantity required and the containers to be used. Annex A describes the general types of mechanical sampling devices used on flowing grain, and shows illustrations of examples of such devices. Annex B gives examples of instruments used to sample static products, and examples of instruments used to divide samples. Annex A and B are not exhaustive. Mechanical sampling devices shall have suitable points of access for the examination, cleaning, maintenance, and repair of all surfaces subject to wear. The points of access should be made of materials which do not generate an electrostatic charge. For maize, suction sampling devices should have a twin bore tube with an air supply. These suction sampling devices may also be used for other cereals. 5 Sampling 5.1 General Sampling in bulk concerns both the sampling of flowing cereals and the sampling of static cereals. In both cases, the sample can be taken using mechanical or manual means. Sampling from packed units (2.7) only concerns static sampling and only uses manual means. The number of increments and the masses are given in Tables 1 and 2 for grain, in Tables 3 and 4 for milled and other cereal products and in Table 5 for milled and other cereal products in packed units. One laboratory sample (2.5) is required by lot or sub-lot of 1 500 t maximum. EXAMPLE For a lot of 6 000 t, analyse at least four laboratory samples. NOTE The ranges of masses indicated in Tables 1 to 5 come from ISO/TR 29263[9]. 5.2 Sampling of bulk products 5.2.1 General Whenever possible, sampling should be carried out when the products are flowing (e.g. during loading or unloading) so that all the constituent parts of the lot have the same probability of being sampled. When mechanical means are not available, implement a manual sampling plan. The methods (mechanical or manual) of taking samples from flowing lots shall be adapted to the speed at which the products are flowing (see Tables 1 and 3). For static grain, whichever method of sampling is used, the increments should be taken at regular intervals over the entire width and depth, up to 9 m. Sample lots of bulk grain which are more than 9 m deep when they are flowing. SIST EN ISO 24333:2010
ISO 24333:2009(E) 4 © ISO 2009 – All rights reserved For lorries and trailers, it is recommended that samples be taken statically. In order for the aggregate sample to be representative, the number of increments shall be as high as possible. Tables 1 to 4 specify the minimum numbers of increments to be carried out in different situations. 5.2.2 Sampling of flowing bulk products 5.2.2.1 General. Since the characteristics and make-up of the lot can vary, the increments shall be taken from the whole lot, i.e. as long as the material is flowing. 5.2.2.2 Mechanical sampling. Adjust the equipment so that the size of the increments or the frequency of sampling can be varied over a wide range. A series of fixed-size increments shall be taken at pre-determined intervals according to the flow and in such a way that each part of the lot has the same chance of entering the sampling device intake. EXAMPLE Crosscut sampling devices meet this requirement irrespective of the type of flow. 5.2.2.3 Manual sampling. Take increments at regular intervals. 5.2.3 Sampling of static bulk products For static sampling, the means and methods of taking samples shall take into account the height of the product to be sampled. Up to a depth of 2 m, manual probes can be used. Up to a depth of 2,5 m, mechanical sampling devices can be used if the principle of sampling according to which they function does not create any segregation at the probe tube intake and does not cause damage to the grains. Otherwise, if the height of the product exceeds 2,5 m, only suction sampling devices shall be used. Sample lots of bulk grain which are more than 9 m deep when they are flowing. The lot should be sampled over its entire depth using a grid method (see Figures 1 and 2). In the current state-of-the-art, the sampling probes used for grain are not correctly adapted to the powdery nature of flours. 5.2.4 Number and mass of samples of grain 5.2.4.1 Number and mass of increments The number and the mass of the increments are given in Tables 1 and 2. All the increments taken together constitute the aggregate sample which shall be homogenized and divided (6.1 and 6.2) to form the laboratory sample. 5.2.4.2 Mass of laboratory samples The recommended mass of a laboratory sample is determined by the type and the requirements of the tests that are to be carried out (see Tables 1 and 2). For analysis of contaminants, the mass of the laboratory sample shall be from 1 kg to 10 kg. For analysis of other characteristics, it shall be at least 1 kg (3 kg for samples taken with a view to trial milling). SIST EN ISO 24333:2010
ISO 24333:2009(E) © ISO 2009 – All rights reserved 5 5.2.4.3 Sampling of flowing bulk products by mechanical or manual means The mechanical sampling device shall be set up so that increments of the size specified in Table 1 below can be obtained. The size of these increments and samples is given for information only and is not intended to replace national specifications or requirements. Table 1 — Sampling procedure to obtain the minimum mass of laboratory sample for flowing grain Sampling of flowing grain by mechanical or manual means Method Range of mass of increment Minimum number of incrementsa Minimum mass of laboratory sample for contaminants Minimum mass of laboratory sample for other analyses Mechanical sampling 300 g to 1 900 g — 20 per lot or sub-lot of 500 t — 25 per lot or sub-lot of 1 500 t for large batches of size greater than 1 500 t For contaminants: — 20 per lot or sub-lot of 500 t — 25 per lot or sub-lot of 1 500 t for large batches of size greater than 1 500 t Manual sampling 300 g to 1 900 g For other analyses: — 3 per lot or sub-lot of 500 t — 4 per lot or sub-lot of 1 500 t for large batches of size greater than 1 500 t For ochratoxin A and aflatoxins: 10 kg For pesticides, heavy metals, dioxins: 1 kg For other contaminantsb: 3 kg 1 kg to 3 kg according to analytical requirements a Frequency according to grain flow. b Other contaminants like deoxynivalenol (DON), fumonisins, zearalenone; for the determination of DON, the mass of laboratory sample can be 1 kg. 5.2.4.4 Sampling of static bulk products The number of samples to be taken for laboratory analysis and arbitration shall be subject to an agreement between the parties concerned. The number and size of increments can be those indicated in Table 2. If the mass of the laboratory sample cannot be complied with, the number of increments shall be increased. Figure 1 shows examples of the distribution of eight sampling points and Figure 2 for 25. SIST EN ISO 24333:2010
ISO 24333:2009(E) 6 © ISO 2009 – All rights reserved Table 2 — Sampling procedure to obtain the minimum mass of laboratory sample for static grain Sampling of static bulk grain (mechanical sampling systems recommended) in trailers or lorries, wagons, ships or bulk tankers, silos or warehouses Size of lot or sub-lot m Range of mass of incrementa Minimum number of incrementsb Minimum mass of laboratory sample for contaminants Minimum mass of laboratory samplefor other analyses m u15 t 3 sampling points 15 < m u30 t 8 sampling points 30 < m u45 t 11 sampling points 45 < m u100 t 15 sampling points 100 < m u300 t 18 sampling points 300 < m u500 t 20 sampling points 500 < m u1 500 t 25 sampling points Per lot or sub-lot of 1 500 t 400 g to 3 000 g 25 sampling points For ochratoxin A and aflatoxins: 10 kg For pesticides, heavy metals, dioxins: 1 kg For other contaminantsc: 3 kg 1 kg to 3 kg according to the analytical requirements a If taken mechanically, the mass of the sample can be appropriate to the equipment. b For grain bulks of great depth, a sample taken every 2 m over a sampling height corresponds to one increment. Repeat the procedure as many times as necessary. c Other contaminants like DON, fumonisins, zearalenone; for the determination of DON, the mass of laboratory sample can be 1 kg.
a)
For lorries “in one piece” (e.g. dumper truck, semi-trailer)
Chassis Trailer b)
For lorries distributed in chassis and trailer Figure 1 — Examples of the distribution of sampling points for 8 points
Figure 2 — Examples of the distribution of sampling points for 25 points SIST EN ISO 24333:2010
ISO 24333:2009(E) © ISO 2009 – All rights reserved 7 5.2.5 Number and mass of samples of milled and other cereal products See Tables 3 and 4. Table 3 — Sampling procedure to obtain the minimum mass of laboratory sample for flowing milled and other cereal products Sampling of flowing milled and other cereal products by mechanical or manual means Method Indicative mass of increment Minimum number of increments Minimum mass of laboratory sample for contaminants Minimum mass of laboratory sample for other analyses Mechanical sampling 300 g to 1 900 g 15 per lot or sub-lot of 100 t (frequency according to flow) Manual sampling 300
g to 1 900 g 15 per lot or sub-lot of 100 t: i.e. for a flow u 20 t/h, minimum of 3 per houri.e. for a flow > 20 t/h, minimum of 3 per 20 t For powdery products: 1 kg For agglomerated products (e.g.: pellets…): 3 kg 1 kg to 3 kg according to the analytical requirements NOTE 1 Additional increments may be required to reach the minimum mass of laboratory sample. NOTE 2 As it is assumed that powdery products are more homogeneous than grains, a laboratory sample of 1 kg is sufficient for contaminant analysis.
Table 4 — Sampling procedure to obtain the minimum mass of laboratory sample for static milled and other cereal products Sampling of static bulk milled and other cereal products (mechanical sampling systems recommended) in trailers or lorries, wagons Size of sub-lot or lot m Indicative mass of increment Minimum number of increments Minimum mass of laboratory sample for contaminants Minimum mass of laboratory sample for other analyses m u15 t 3 sampling points 15 < m u30 t 3 sampling points per compartment 30 < m u45 t 5 sampling points per compartment m > 45 t 400 g to 3 000 g 8 sampling points per compartment For powdery products: 1 kg For agglomerated products (e.g.: pellets…): 3 kg 1 kg to 3 kg according to the analytical requirements NOTE 1 Additional increment may be required to reach the minimum mass of laboratory sample. NOTE 2 As it is assumed that powdery products are more homogeneous than grains, a laboratory sample of 1 kg is sufficient for contaminant analysis. It is recommended to sample milled and other cereal products when flowing, during manufacturing or upon shipment. The sampling in silos is not recommended. SIST EN ISO 24333:2010
ISO 24333:2009(E) 8 © ISO 2009 – All rights reserved 5.3 Sampling of milled and other cereal products in packed units 5.3.1 “Crates boxes” or sacks and bags to be sampled A lot is constituted by a group of basic units (“packed unit”) which originate from one or several sources of manufacture which have the same traceability identification code on the individual packaging. The packed units are generally transported in crates boxes or pallets which contain an appropriate number of basic units. The method applicable to sacks (see 5.3.3) shall be used to define the appropriate number of crates boxes or pallets that are to be sampled. 5.3.2 Increments or packed units The packed unit shall be the increment sampled at random from the overall contents of the lot selected for sampling. IMPORTANT — Avoid selecting packed units which occupy the same position in several crates boxes or pallets. 5.3.3 Number and mass of increments The increments shall be taken from the centre and over the whole length of each packed unit to be sampled using a tapered sampling probe specially designed for sacks (see B.1.2). They shall be taken from the number of sacks specified below. The following equation shall be used as a guide for determining the frequency of sampling per lot, F(n), for lots marketed in individual packages (sacks, retail packages, etc.). Take an incremental sample from every nth sack or bag (decimal figures should be rounded to the nearest whole number), where n is the number of packed units between two increments.
BI AP ()mmFnmm= where mB is the mass, in kilograms, of the lot; mI is the mass, in kilograms, of the increments (approximately 0,100 kg); mA is the mass, in kilograms, of the aggregate sample; NOTE For analyses of contaminants, mA is approximately 1 kg for powdery products and 3 kg for agglomerated products (e.g. pellets), and 1 kg to 3 kg for other analyses. mP is the mass, in kilograms, of the individual package. The frequency of sampling per lot calculated with a mass of increment of 0,100 kg corresponds to a minimum number of increments to be taken. If the mass of the increment is greater than 0,100 kg, the frequency of sampling calculated with 0,100 kg shall be applied. Practical examples of a calculated frequency of sampling for lots of 25 t, 50 t and 100 t are given in Table 5 and Figure 3. SIST EN ISO 24333:2010
ISO 24333:2009(E) © ISO 2009 – All rights reserved 9 Table 5 — Sampling procedure to obtain the minimum mass of laboratory sample for milled and other cereal products in packed units: practical examples for lots of 25, 50 and 100 tonnes and an average mass of 800 kg per pallet Lot size Mass of individual sacks Mass of increment Calculated frequency of sampling for contaminant analysis on agglomerated product Equivalent per pallet Calculated frequency of sampling for contaminants analysis on powdered products or for other analyses on any type of product Equivalent per pallet kg kg kg 1 increment every nth packed unit 1 sample shall be all n bags, or 1 sample shall be all x pallets 1 increment every nth packed unit 1 sample shall be all n bags, or 1 sample shall be
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.