BS ISO 8070-2007 Milk and milk products - Determination of calcium sodium potassium and magnesium contents - Atomic absorption spectrometric method《牛奶和奶制品 钙、钠、钾和镁含量的测定 原子吸.pdf
《BS ISO 8070-2007 Milk and milk products - Determination of calcium sodium potassium and magnesium contents - Atomic absorption spectrometric method《牛奶和奶制品 钙、钠、钾和镁含量的测定 原子吸.pdf》由会员分享,可在线阅读,更多相关《BS ISO 8070-2007 Milk and milk products - Determination of calcium sodium potassium and magnesium contents - Atomic absorption spectrometric method《牛奶和奶制品 钙、钠、钾和镁含量的测定 原子吸.pdf(24页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD BS ISO 8070:2007 Milk and milk products Determination of calcium, sodium, potassium and magnesium contents Atomic absorption spectrometric method ICS 67.100.10 BS ISO 8070:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on
2、28 September 2007 BSI 2007 ISBN 978 0 580 56933 3 National foreword This British Standard is the UK implementation of ISO 8070:2007. It supersedes BS 1743-20:1988 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AW/5, Chemical analysis of milk and milk
3、 products. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer i
4、mmunity from legal obligations. Amendments issued since publication Amd. No. Date Comments Reference numbers ISO 8070:2007(E) IDF 119:2007(E)INTERNATIONAL STANDARD ISO 8070 IDF 119 Second edition 2007-08-15 Milk and milk products Determination of calcium, sodium, potassium and magnesium contents Ato
5、mic absorption spectrometric method Lait et produits laitiers Dtermination des teneurs en calcium, sodium, potassium et magnsium Mthode spectromtrique par absorption atomique BS ISO 8070:2007ii iii Contents Page Foreword iv Foreword. v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions.
6、1 4 Principle. 1 5 Reagents 2 6 Apparatus 2 7 Sampling 3 8 Preparation of test sample. 4 8.1 Milk and whey 4 8.2 Buttermilk 4 8.3 Yogurt 4 8.4 Cream. 4 8.5 Dried milk. 4 8.6 Butter 4 8.7 Cheese . 5 8.8 Caseins and caseinates . 5 9 Procedure 5 9.1 Test portion . 5 9.2 Decomposition of organic matter
7、. 6 9.3 Determination 7 10 Calculation and expression of results 8 10.1 Calculation. 8 10.2 Expression of test results 9 11 Precision 9 11.1 Repeatability 9 11.2 Reproducibility 9 12 Test report . 10 Annex A (informative) Interlaboratory trials 11 Bibliography . 14 BS ISO 8070:2007iv Foreword ISO (t
8、he 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 commit
9、tee 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 electrotech
10、nical 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
11、 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
12、 any or all such patent rights. ISO 8070 IDF 119 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF). It is being published jointly by ISO and IDF. This second edition of ISO 8070 IDF 119 cancels and re
13、places the first edition (ISO 8070:1987), which has been technically revised. BS ISO 8070:2007 v Foreword IDF (the 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
14、 on the IDF Standing Committees carrying out the technical work. IDF collaborates with ISO 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 Comm
15、ittees for voting. Publication as an International Standard requires approval by at least 50 % of the IDF National Committees casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IDF shall not be held responsible for id
16、entifying any or all such patent rights. ISO 8070 IDF 119 was prepared by the International Dairy Federation (IDF) and Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products. It is being published jointly by IDF and ISO. All work was carried out by the Joint ISO-IDF
17、Action Team Minor compounds, of the Standing Committee on Minor components and characterization of physical properties, under the aegis of its project leaders, Mr L. Nol (FR) and Mr. M. Carl (DE). This edition of ISO 8070 IDF 119 cancels and replaces IDF 119A:1987 and IDF 154:1992, which have been t
18、echnically revised. BS ISO 8070:2007 blank 1 Milk and milk products Determination of calcium, sodium, potassium and magnesium contents Atomic absorption spectrometric method 1 Scope This International Standard specifies a flame atomic absorption spectrometric method for the determination of calcium,
19、 sodium, potassium and magnesium contents in milk and milk products. The method is applicable for milk and whey, buttermilk, yogurt, cream, dried milk, butter, cheese, casein and caseinate. 2 Normative references The following referenced documents are indispensable for the application of this docume
20、nt. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 648, Laboratory glassware One-mark pipettes ISO 1042, Laboratory glassware One-mark volumetric flasks ISO 3696, Water for analytical
21、 laboratory use Specification and test methods 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 calcium, sodium, potassium, magnesium contents mass fraction of substances determined by the procedure specified in this International Standard NOT
22、E The respective contents are expressed in milligrams per gram. 4 Principle The organic matter is decomposed by dry ashing or by wet digestion using nitric acid either in an open microwave-assisted wet digestion system or in a pressurized microwave-assisted wet digestion system or in a pressurized p
23、olytetrafluoroethylene (PTFE) decomposition vessel or any appropriate instrumentation in wet digestion. The ash containing calcium, sodium, potassium, and magnesium is dissolved in a nitric acid solution in the case of dry ashing, or the digests diluted in the case of wet digestion. The test and cal
24、ibration solutions are atomized into an airacetylene flame of an atomic absorption spectrometer and their absorption is measured at appropriate wavelengths. BS ISO 8070:20072 5 Reagents Use reagents of recognized analytical grade, unless otherwise specified, and water complying with grade 2 in accor
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