EN ISO 5537-2004 en Dried milk - Determination of moisture content (Reference method)《奶粉 水含量的测定(参照法) ISO 5537-2004》.pdf

1、BRITISH STANDARD BS EN ISO 5537:2004 Dried milk Determination of moisture content (Reference method) The European Standard EN ISO 5537:2004 has the status of a British Standard ICS 67.100.10 BS EN ISO 5537:2004 This British Standard was published under the authority of the Standards Policy and Strat

2、egy Committee on 17 June 2004 BSI 17 June 2004 ISBN 0 580 43933 X National foreword This British Standard is the official English language version of EN ISO 5537:2004. It is identical with ISO 5537:2004. The UK participation in its preparation was entrusted to Technical Committee AW/5, Milk and milk

3、 products, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue

4、under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct

5、application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informe

6、d; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 7 and a back cover. The BSI copyrig

7、ht notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO5537 June2004 ICS67.100.10 Englishversion DriedmilkDeterminationofmoisturecontent(Reference method)(ISO5537:

8、2004) LaitsecDterminationdutauxdhumidit(Mthodede rfrence)(ISO5537:2004) ThisEuropeanStandardwasapprovedbyCENon7May2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodateli

9、stsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguag

10、eandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,

11、 Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.N

12、o.ENISO5537:2004:ENE IS55 O4002:73 E() 2 Foreword This document (EN ISO 5537:2004) has been prepared by Technical Committee ISO/TC 34 “Agricultural food products“ in collaboration with Technical Committee CEN/TC 302 “Milk and milk products - Methods of sampling and analysis“, the secretariat of whic

13、h is held by NEN. 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 December 2004, and conflicting national standards shall be withdrawn at the latest by December 2004. According to the CEN/CENELEC

14、Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, N

15、etherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 5537:2004 has been approved by CEN as EN ISO 5537:2004 without any modifications. ENISO5537:2004 Reference numbers ISO 5537:2004(E) IDF 26:2004(E) OSI DI dnaF 4

16、002INTERNATIONAL STANDARD ISO 5537 IDF 26 First edition 2004-06-01 Dried milk Determination of moisture content (Reference method) Lait sec Dtermination du taux dhumidit (Mthode de rfrence) ENISO5537:2004IS:7355 O4002(E) ID:62 F4002(E) DPlcsid Fremia ihTs PDF file may ctnoian emdebt dedyfepcaes. In

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22、o gr Plbuisdehi n Switlrez dnaii ISO dnaID 4002 FA ll rihgtsser edevrENISO5537:2004IS:7355 O4002(E) ID:62 F4002(E) I SO dna ID 4002 F All irhgts seredevr iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). T

23、he 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-go

24、vernmental, 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.

25、 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 v

26、ote. 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 5537 IDF 26 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5,

27、 Milk and milk products, and the International Dairy Federation (IDF), in collaboration with AOAC International. It is being published jointly by ISO and IDF and separately by AOAC International. ENISO5537:2004IS:7355 O4002(E) ID:62 F4002(E) iv I SO dna ID 4002 F All irhgts seredevrForeword IDF (the

28、 International Dairy Federation) is a worldwide federation of the dairy sector with a National Committee in every member country. Every National Committee has the right to be represented on the IDF Standing Committees carrying out the technical work. IDF collaborates with ISO and AOAC International

29、in the development of standard methods of analysis and sampling for milk and milk products. Draft International Standards adopted by the Action Teams and Standing Committees are circulated to the National Committees for voting. Publication as an International Standard requires approval by at least 5

30、0 % of the National Committees casting a vote. ISO 5537 IDF 26 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF), in collaboration with AOAC International. It is being published jointly by ISO and IDF

31、 and separately by AOAC International. All work was carried out by the Joint ISO/IDF/AOAC Action Team Action Team, Water, of the Standing Committee, Main components in milk, under the aegis of its project leader, Mr G.J. Beutick (NL) and Mr R.J. de Knegt (NL). This first edition of ISO 5537 IDF 26 c

32、ancels and replaces the first edition of IDF 26A:1993, which has been technically revised. ENISO5537:2004NITERNATNOIAL STANDARD IS:7355 O4002(E) ID:62 F4002(E)I SO dna ID 4002 F All irhgts seredevr 1Dried milk Determination of moisture content (Reference method) WARNING The use of ISO 5537 IDF 26 ma

33、y involve the use of hazardous materials, operations, and equipment. This standard does not purport to address all the safety risks associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of l

34、ocal regulatory limitations prior to use. 1 Scope This International Standard specifies a method for the determination of the moisture content of all types of dried milk. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 moisture content mass f

35、raction of substances determined by the procedure specified in this International Standard NOTE The moisture content is expressed as a percentage by mass. 3 Principle A test portion is dried in a drying oven set at 87 C for 5 h while dry air is passed through the test portion. The loss of mass of th

36、e test portion (which is related to the content of “non-chemically bound” water) is determined. 4 Apparatus Usual laboratory apparatus and, in particular, the following. 4.1 Analytical balance, capable of weighing to the nearest 1 mg, with a readability of 0,1 mg. 4.2 Drying oven, capable of being m

37、aintained at 87 C 1 C throughout the working space, with forced ventilation, thermostatically controlled, with the following equipment (see also Figure A.1). 4.2.1 Metal block, provided with channels of diameter 4,3 mm for holding the columns (4.4) in the drying oven. 4.2.2 Copper tubes, of length 1

38、 500 mm, of internal diameter 2 mm, connected to the metal block in the drying oven. 4.2.3 Constant pressure regulator, provided with restrictors, capable of delivering 33 ml/min of dry air to each column in the drying oven. ENISO5537:2004IS:7355 O4002(E) ID:62 F4002(E) 2 I SO dna ID 4002 F All irhg

39、ts seredevr4.2.4 Tube, made of polycarbonate, of length 350 mm, of diameter 40 mm, filled with silica gel with hygrometric indicator. The silica gel should have been dried at 150 C for more than 12 h before use. Using the dry compressed air (4.11), no colour change of the hygrometric indicator shoul

40、d be noticed. 4.3 Desiccator, containing freshly dried silica gel with hygrometric indicator. 4.4 Columns, made of hard polypropylene (Phenomenex 121310211) 1) , of length 90 mm, of internal diameter 20 mm, provided with two polyethene filters (Phenomenex 12121023) 1) , narrowed towards one end to f

41、it onto the block (4.2.1). 4.5 Synthetic stoppers, made of soft polyethylene (Emergo 20273 B198 and 20371 U1) 1) . 4.6 Container, suitable for holding the columns (4.4). 4.7 Container, suitable for holding the synthetic stoppers (4.5). 4.8 Rod, made of polyvinyl chloride (PVC), of length 120 mm, of

42、diameter 18 mm, suitable for placing the polyethylene filters in the column (4.4). 4.9 Tweezers, suitable for removing the polyethylene filters from the column (4.4). 4.10 Soap-film meter, suitable for measuring a flow of 33 ml/min. 4.11 Dry compressed air, minimum pressure of 200 kPa, moisture cont

43、ent of u 0,01 mgH 2 O per litre at atmospheric pressure, free of any organic material. Use metal tubes only to connect the source of compressed air to the equipment in the drying oven (4.2). 4.12 Container, made of glass, provided with an airtight lid. NOTE The apparatus mentioned in 4.2 and those i

44、n 4.4 to 4.8 are available commercially (e.g. Elbanton and Funke Gerber) 2) . 5 Sampling It is important that the laboratory receive a sample which is truly representative and has not been damaged or changed during transport or storage. Sampling is not part of the method specified in this Internatio

45、nal Standard. A recommended sampling method is given in ISO 707. 6 Preparation of test sample Transfer the whole test sample to a dry, hermetically closed container (4.12) of capacity approximately twice the volume of the sample. Mix intensively by rotating and shaking the container. Use a statistic

46、al sampling plan if there is evidence of sample inhomogeneity even after the intensive mixing mentioned above. 1) Phenomenex and Emergo are examples of suitable products available commercially. 2) Elbanton and Funke Gerber are the trade names of products supplied by Elbanton b.v., Uitingstraat 18, 5

47、331 EJ, Kerkdriel (NL) and Funke-Dr.N.Gerber Labortechnik GmbH, Ringstrasse 42, 12105, Berlin, respectively. The information in footnotes 1) and 2) is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO or IDF of the product named. Equivale

48、nt products may be used if they can be shown to lead to the same results. ENISO5537:2004IS:7355 O4002(E) ID:62 F4002(E) I SO dna ID 4002 F All irhgts seredevr 37 Procedure 7.1 Preparation of column 7.1.1 Set the constant pressure regulator at approximately 100 kPa. Measure, using the soap-film meter (4.10), the airflow of each channel. Calculate the average flow per channel. Adjust the pressure, if necessary, to obtain an average airflow of 33 ml/min per channel. 7.1.2 Remove both synthetic stoppers from the column (4.4