BS-7142-4-1989 ISO-8262-3-1987.pdf
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1、BRITISH STANDARD BS 7142-4: 1989 ISO 8262-3: 1987 Methods for Analysis of milk-based products Part 4: Determination of fat content of liquid, concentrated and dried milk products by the Weibull-Berntrop gravimetric method Licensed Copy: London South Bank University, London South Bank University, Fri
2、 Dec 08 13:51:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7142-4:1989 This British Standard, having been prepared under the direction of the Dairying Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 October 1989 BSI 11-1999 The follow
3、ing BSI references relate to the work on this standard: Committee reference DAC/3 Draft for comment 86/52574 DC. ISBN 0 580 17463 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Dairying Standards Policy Committee (DAC/-) to Technical
4、Committee DAC/3, upon which the following bodies were represented: AFRC Institute of Food Research, Reading Laboratory Association of British Preserved Milk Manufacturers Association of Public Analysts Association of Public Analysts of Scotland Creamery Proprietors Association Department of Trade an
5、d Industry (Laboratory of the Government Chemist) Ice Cream Alliance Limited Intervention Board for Agricultural Produce Joint Committee of the Milk Marketing Board and the Dairy Trade Federation Milk Marketing Board Milk Marketing Board for Northern Ireland Ministry of Agriculture, Fisheries and Fo
6、od Royal Association of British Dairy Farmers Royal Society of Chemistry Society of Chemical Industry Society of Dairy Technology Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:51:50 GMT+00:00
7、 2006, Uncontrolled Copy, (c) BSI BS 7142-4:1989 BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii 0Introduction1 1Scope and field of application1 2Reference1 3Definition1 4Principle1 5Reagents and materials1 6Apparatus2 7Sampling2 8Procedure2 9Expression of res
8、ults4 10Notes on procedure5 11Test report5 12Bibliography5 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:51:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7142-4:1989 ii BSI 11-1999 National foreword This Part of
9、BS 7142, which has been prepared under the direction of the Dairying Standards Policy Committee, is identical with ISO 8262 “Milk products and milk-based foods Determination of fat content by the Weibull-Berntrop gravimetric method (Reference method) Part 3: Special cases”, prepared by ISO/TC 34, Ag
10、ricultural food products, of the International Organization for Standardization (ISO). The method described in ISO 8262-3 was developed jointly with the International Dairy Federation (IDF) and the Association of Official Analytical Chemists (AOAC). The Technical Committee has reviewed the provision
11、s of ISO 1737, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard for ISO 1737 is BS 1742 “Methods for analysis of condensed milks”. It is envisaged that an identical dual numbered standard will be pu
12、blished. Additional information. Although not specified in the ISO text, it is strongly recommended that duplicate determinations are undertaken. Provided that the duplicate values, calculated as described in 9.1, comply with the repeatability requirement of 9.2.1, the results should be reported as
13、the mean value, and in such cases, the test report (see clause 11) should include a reference to the fact that such a result has been reported. Cross-references International StandardCorresponding British Standard ISO 707:1985BS 809:1985 Methods for sampling of milk and milk products (Identical) ISO
14、 1211:1984BS 1741 Methods for chemical analysis of liquid milk and cream Part 3:1987 Determination of fat content of liquid milk (Identical) ISO 1443:1973BS 4401 Methods of test for meat and meat products Part 4:1970 (1986) Determination of total fat content (Method A, technically equivalent) ISO 17
15、35:1987BS 770 Methods for chemical analysis of cheese Part 3:1989 Determination of fat content (reference method) (Identical) ISO 1736:1985BS 1743 Methods for analysis of dried milk and dried milk products Part 11:1986 Determination of fat content (gravimetric reference method) (Identical) ISO 2450:
16、1985BS 1741 Methods for chemical analysis of liquid milk and cream Part 4:1987 Determination of fat content of cream (Identical) ISO 5725:1986BS 5497 Precision of test methods Part 1:1987 Guide for the determination of repeatability and reproducibility for a standard test method by inter-laboratory
17、tests (Identical) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:51:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7142-4:1989 BSI 11-1999iii When results reported are the mean of two values that comply with the repeatability requirement, the difference be
18、tween the results reported for fat content, obtained on samples of the same test material by two different analysts in two different laboratories, should not exceed the values stated in 9.2.2. A British Standard does not purport to include all the necessary provisions of a contract. Users of British
19、 Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 6, an inside back cover and a back cover. T
20、his standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:51:50 GMT+00:00 2006, Uncontrolled Copy, (c)
21、BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:51:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7142-4:1989 BSI 11-19991 0 Introduction This International Standard has been prepared within the framework of producing a series of reference meth
22、ods, which are harmonized to the greatest possible extent, for the gravimetric determination of the fat content of milk, milk products and milk-based foods. These methods are based on either the Rse-Gottlieb (RG), or the Weibull-Berntrop (WB) or the Schmid-Bondzynski-Ratzlaff (SBR) principle. For th
23、is part of ISO 8262, dealing with milk-based and with liquid, concentrated or dried milk products in poor condition and/or containing insoluble non-milk ingredients, a method based on the WB principle has been chosen because a) when a distinct quantity of free fatty acids is present, or when the pro
24、duct contains lumps and/or non-milk ingredients insoluble in ammonia, the extraction of fat is incomplete and thus the RG procedure is not suitable; b) a considerable lactose content, giving rise to some ether-extractable compounds in the digestion with acid and thus to too high values for the fat c
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