BS-5766-11-1986 ISO-6490-1-1985.pdf
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1、BRITISH STANDARD BS 5766-11: 1986 ISO 6490-1: 1985 Methods for Analysis of animal feeding stuffs Part 11: Determination of calcium by titration ISO title: Animal feeding stuffs Determination of calcium content Part 1: Titrimetric method UDC 636.085:546.41:543.242.5 Licensed Copy: sheffieldun sheffie
2、ldun, na, Mon Dec 04 14:29:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-11:1986 This British Standard, having been prepared under the direction of the Food and Agriculture Standards Committee, was published under the authority of the Board of BSI and comes into effect on 28 November 1986 BS
3、I 12-1999 The following BSI references relate to the work on this standard: Committee reference FAC/14 Draft for comment 83/56072 DC ISBN 0 580 15443 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Food and Agriculture Standards Commit
4、tee (FAC/-) to Technical Committee FAC/14, upon which the following bodies were represented: Association of Public Analysts Department of Trade and Industry (Laboratory of the Government Chemist) Grain and Feed Trade Association Limited Ministry of Agriculture, Fisheries and Food National Farmers Un
5、ion Overseas Development Administration (Tropical Development and Research Institute) Pet Food Manufacturers Association Royal Association of British Dairy Farmers United Kingdom Agricultural Supply Trade Association Ltd. United Kingdom Renderers Association Ltd. Amendments issued since publication
6、Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:29:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-11:1986 BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope and field of application1 2References1 3Principle1 4
7、Reagents1 5Apparatus1 6Sampling1 7Procedure1 8Expression of results2 9Notes on procedure2 10Test report2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:29:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-11:1986 ii BSI 12-1999 National forewo
8、rd This Part of BS 5766 has been prepared under the direction of the Food and Agriculture Standards Committee. It is identical with ISO 6490-1:1985 “Animal feeding stuffs Determination of calcium content Part 1: Titrimetric method” published by the International Organization for Standardization (ISO
9、), in the preparation of which the United Kingdom played a full part. In the United Kingdom, animal feeding stuffs are controlled by legislation. The method in this Part of BS 5766 is technically equivalent to the method given in the Feeding Stuffs (Sampling and analysis) Regulations 1982, SI 1982 N
10、o. 11441). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the
11、following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. In British Standards it is current practice to use the symbol “L” for litre (and in its submultiples) rather than “l” and to use the spelling
12、 “sulphur”, etc. instead of “sulfur”, etc. Wherever the words “International Standard” and “part of ISO 6490” appear, referring to this standard, they should be read as “Part of BS 5766”. When ISO 6497, referred to in clause 6, is published it is intended to implement it as a dual-numbered (identica
13、l) British Standard. In the meantime, parties concerned are recommended to reach agreement on sampling. The Technical Committee has reviewed the relevant provisions of ISO 6498:1983, referred to in 7.1 and has decided that they are acceptable for use in conjunction with this standard. The United Kin
14、gdom did not approve ISO 6498 but, in the present context, samples prepared in accordance with either ISO 6498 or BS 5766 “Methods for analysis of animal feedings stuffs” Part 10 “Preparation of test samples” are equally acceptable. A British Standard does not purport to include all the necessary pr
15、ovisions 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 obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2
16、, 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 indicated in the amendment table on the inside front cover. 1) Published by HMSO. Cross-references International StandardCorresponding British Standard
17、ISO 6490-2:1983BS 5766 Methods for analysis of animal feeding stuffs Part 6:1984 Determination of calcium by atomic absorption spectrometry (Identical) Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:29:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5766-11:1986 BSI 12-19991 1 Scope and
18、field of application This part of ISO 6490 specifies a titrimetric method for the determination of the calcium content of animal feeding stuffs. The method is applicable to all animal feeding stuffs having calcium contents greater than 1 g/kg. 2 References ISO 6490-2, Animal feeding stuffs Determina
19、tion of calcium content Part 2: Atomic absorption spectrometric method. ISO 6497, Animal feeding stuffs Sampling2). ISO 6498, Animal feeding stuffs Preparation of test samples. 3 Principle Ashing of a test portion, treatment of the ash with hydrochloric acid and precipitation of the calcium as calci
20、um oxalate. Dissolution of the precipitate in sulfuric acid and titration with standard volumetric potassium permanganate solution of the oxalic acid formed. 4 Reagents All reagents shall be of recognized analytical quality and the water used shall be distilled water or water of at least equivalent
21、purity. 4.1 Hydrochloric acid, approximately 30 % (m/m) (20 = 1,15 g/ml). 4.2 Nitric acid, concentrated (20 = 1,40 g/ml). 4.3 Sulfuric acid, approximately 20 % (m/m) (20 = 1,13 g/ml). 4.4 Ammonia solution, approximately 33 % (m/m) (20 = 0,89 g/ml). 4.5 Ammonium oxalate, cold saturated solution. 4.6
22、Citric acid monohydrate, 300 g/l solution. 4.7 Ammonium chloride, 50 g/l solution. 4.8 Bromocresol green, 0,4 g/l solution. 4.9 Potassium permanganate, standard volumetric solution, c (1/5 KMnO4) = 0,1 mol/l. 5 Apparatus Usual laboratory apparatus, and in particular 5.1 Electric muffle furnace, with
23、 air circulation, capable of being maintained at 550 20 C. 5.2 Incineration dish, made of platinum, silica or porcelain. 5.3 Sintered glass filter crucible, of porosity grade P 16 (pore size 10 to 16 4m). 5.4 Boiling water-bath 5.5 Beakers, of capacity 250 ml. 5.6 Volumetric flask, of capacity 250 m
24、l. 5.7 Analytical balance 6 Sampling Take the laboratory sample as specified in ISO 6497. 7 Procedure 7.1 Preparation of the test sample Prepare the test sample in accordance with ISO 6498. 7.2 Test portion Weigh, to the nearest 1 mg, approximately 5 g of the test sample (or more if necessary), into
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