BS-5766-3-1999 ISO-6491-1998.pdf
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1、BRITISH STANDARD BS 5766-3:1999 ISO 6491:1998 Methods for analysis of animal feeding stuffs Part 3: Determination of phosphorus content (spectrometric method) ICS 65.120 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:46:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-3:1999 This Bri
2、tish Standard, having been prepared under the direction of the Consumer Products and Services Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 May 1999 BSI 03-2000 ISBN 0 580 32124 X National foreword This British Standard reproduces verbatim
3、 ISO 6491:1998 and implements it as the UK national standard. It supersedes BS 5766-3:1981 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AW/10, Animal feeding stuffs, which has the responsibility to: aid enquirers to understand the text; present to
4、the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtai
5、ned 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 Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” fa
6、cility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obli
7、gations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be
8、indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:46:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-3:1999 BSI 03-2000i Contents Page National forewordInside front cove
9、r Forewordiii Text of ISO 64911 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:46:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:46:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, M
10、on Dec 04 14:46:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-3:1999 ii BSI 03-2000 Contents Page Forewordiii 1Scope1 2Normative references1 3Principle1 4Reagents1 5Apparatus1 6Sampling1 7Preparation of test sample2 8Procedure2 9Expression of results3 10Precision3 11Test report3 Annex A (inf
11、ormative) Results of interlaboratory test4 Annex B (informative) BibliographyInside back cover Table A.1 Statistical results of interlaboratory test4 Descriptors: Agricultural products, food, animal feeding products, chemical analysis, determination of content, phosphorus, spectrometric method. Lice
12、nsed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:46:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-3:1999 BSI 03-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Int
13、ernational 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 w
14、ith ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as
15、an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 6491 was prepared by Technical Committee ISO/TC 34, Agricultural food products, Subcommittee SC 10, Animal feeding stuffs. This second edition replaces the first edition (ISO
16、6491:1980), which has been technically revised. Annex A and Annex B of this International Standard are for information only. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:46:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:4
17、6:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-3:1999 BSI 03-20001 1 Scope This International Standard specifies a spectrometric method for the determination of the phosphorus content of animal feeding stuffs. The method is applicable to animal feeding stuffs with a phosphorus content less
18、than 50 g/kg. It is particularly appropriate for the analysis of products with low phosphorus content. For products with higher phosphorus content, application of a gravimetric method is advised, using for instance quinoline phosphomolybdate. 2 Normative references The following standards contain pr
19、ovisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the
20、 possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3696:1987, Water for analytical laboratory use Specification and test methods. ISO 6498:1998, Animal feeding stuffs Preparatio
21、n of test samples. 3 Principle A test portion of the sample is either ashed with lime and heated with acid (in the case of organic feeding stuffs) or wet oxidized with a mixture of sulfuric and nitric acids (in the case of mineral compounds and liquid feeding stuffs). An aliquot portion of the acid
22、solution is mixed with molybdovanadate reagent and the absorbance of the yellow solution obtained is measured at a wavelength of 430 nm. 4 Reagents Use only reagents of recognized analytical grade. 4.1 Water, complying to at least grade 3 in accordance with ISO 3696. 4.2 Calcium carbonate 4.3 Hydroc
23、hloric acid, c(HCl) . 6 mol/l. 4.4 Nitric acid, c(HNO3) . 1 mol/l. 4.5 Nitric acid, c(HNO3) = 14 mol/l, (HNO3) . 1,40 g/ml. 4.6 Sulfuric acid, c(H2SO4) = 18 mol/l, (H2SO4) = 1,84 g/ml. 4.7 Ammonium heptamolybdate solution Dissolve in hot water 100 g of ammonium heptamolybdate tetrahydrate (NH4)6Mo7O
24、244H2O. Add 10 ml of ammonia c(NH4OH) = 14 mol/l, (NH4OH) = 0,91 g/ml and dilute to 1 l with water. 4.8 Ammonium monovanadate solution Dissolve 2,35 g of ammonium monovanadate (NH4VO3) in 400 ml of hot water. Stirring constantly, slowly add 7 ml of nitric acid (4.5) and dilute to 1 l with water. 4.9
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