BS 4401-6-1996 Methods of test for meat and meat products - Determination of chloride content (Volhard method)《肉及肉制品试验方法 第6部分 氯化物测定(伏哈德法)》.pdf
《BS 4401-6-1996 Methods of test for meat and meat products - Determination of chloride content (Volhard method)《肉及肉制品试验方法 第6部分 氯化物测定(伏哈德法)》.pdf》由会员分享,可在线阅读,更多相关《BS 4401-6-1996 Methods of test for meat and meat products - Determination of chloride content (Volhard method)《肉及肉制品试验方法 第6部分 氯化物测定(伏哈德法)》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD BS 4401-6:1996 ISO 1841-1:1996 Methods of test for Meat and meat products Part 6: Determination of chloride content (Volhard method) ICS 67.120.10BS4401-6:1996 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Board, was pub
2、lished under the authority of the Standards Board and comes into effect on 15September1996 BSI 11-1998 First published November 1970 Second edition October 1981 Third edition 1996 The following BSI references relate to the work on this standard: Committee reference AW/6 Draft for comment 94/504478 D
3、C ISBN 0 580 26068 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AW/6, Chemical analysis of meat and meat products, upon which the following bodies were represented: Association of Public Analysts British Meat Manufac
4、turers Association British Poultry Meat Federation Ltd. Department of Trade and Industry (Laboratory of the Government Chemist) Leatherhead Food Research Association Meat and Livestock Commission Ministry of Agriculture, Fisheries and Food National Federation of Meat and Food Traders Royal Society o
5、f Chemistry Worshipful Company of Butchers Amendments issued since publication Amd. No. Date CommentsBS4401-6:1996 BSI 11-1998 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Definition 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Sampling 1 7 Preparation o
6、f test sample 2 8 Procedure 2 9 Calculation 2 10 Precision 2 11 Test report 3 Annex A (informative) Bibliography 4 List of references Inside back coverBS4401-6:1996 ii BSI 11-1998 National foreword This Part of BS 4401 has been prepared by Technical Committee AW/6 and is identical with ISO1841-1:199
7、6 Meat and meat products Determination of chloride content Part1: Volhard method published by the International Organization for Standardization (ISO) and in the preparation of which the United Kingdom played a full part. It is a revision of BS 4401-6:1981 which is withdrawn and from which it differ
8、s in that precision data from an international collaborative trial has been included. A potentiometric method for the determination of chloride content in meat and meat products is given in BS4401-16. ISO 5725:1986, to which informative reference is made in the text, has been superseded by ISO 5725-
9、1:1994, ISO 5725-2:1994, ISO 5725-3:1994, ISO 5725-4:1994 and ISO 5725-6:1994 which are identical with BS ISO 5725 Accuracy (trueness and precision) of measurement methods and results, BSISO5725-1:1994 General principles and definitions, BS ISO 5725-2:1994 Basic methods for the determination of repe
10、atability and reproducibility of a standard measurement method, BS ISO 5725-3:1994, Intermediate measures of the precision of a standard measurement method, BS ISO 5725-4:1994, Intermediate measures of the precision of a standard measurement method, BSISO5725-4:1994 Basic methods for the determinati
11、on of the trueness of a standard measurement method, and BS ISO 5725-6:1994 Use in practice of accuracy values. 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 Briti
12、sh Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard Informative ISO 3100-1:1991 BS 5348 Methods for sampling meat and meat products Part 1:1991 Taking primary samples (Identical) Summary of pages This document
13、 comprises a front cover, an inside front cover, pages i and ii, pages1 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 indicated in the amendment table on the inside front cover.BS4401-6:1996 BSI
14、 11-1998 1 1 Scope This part of ISO 1841 specifies a method for the determination of the chloride content of meat and meat products, including poultry, with sodium chloride contents equal to or greater than 1,0 % (m/m). 2 Definition For the purposes of this part of ISO 1841, the following definition
15、 applies. 2.1 chloride content of meat and meat products total chloride content determined by the method specified in this part of ISO1841. It is expressed as sodium chloride as a percentage by mass 3 Principle Extraction of a test portion with hot water and precipitation of the proteins. After filt
16、ration and acidification, addition of an excess of silver nitrate solution to the extract, and titration of this excess with potassium thiocyanate solution. 4 Reagents Use only reagents of recognized analytical grade unless otherwise specified. 4.1 Water, distilled and halogen-free. Halogen-free tes
17、t: Add 1ml of silver nitrate c(AgNO 3 ) 0,1 mol/l and 5ml of nitric acid c(HNO 3 ) 4mol/l to 100ml of water. No more than a slight turbidity shall be produced. 4.2 Nitrobenzene or nonan-1-ol. 4.3 Nitric acid, c(HNO 3 4 mol/l. Mix 1 volume of concentrated nitric acid (1,39g/ml # r 20# 1,42g/ml) with
18、3 volumes of water. 4.4 Solutions for precipitation of proteins 4.4.1 Reagent A Dissolve in water 106 g of potassium hexacyanoferrate(II) trihydrate K 4 Fe(CN) 6 3H 2 O. Transfer quantitatively to a 1000ml one-mark volumetric flask (5.2) and dilute to the mark with water. 4.4.2 Reagent B Dissolve in
19、 water 220 g of zinc acetate dihydrate Zn(CH 3 COO) 2 .2H 2 O and add 30ml of glacial acetic acid. Transfer quantitatively to a 1000ml one-mark volumetric flask (5.2) and dilute to the mark with water. 4.5 Silver nitrate, standard volumetric solution, c(AgNO 3 )=0,1mol/l. Dissolve in water 16,989 g
20、of silver nitrate, previously dried for 2h at 150C2C and allowed to cool in a desiccator. Transfer quantitatively to a1000ml one-mark volumetric flask (5.2) and dilute to the mark with water. Store this solution in a dark glass container out of direct sunlight 4.6 Potassium thiocyanate, standard vol
21、umetric solution, c(KSCN)=0,1mol/l. Dissolve in water about 9,7g of potassium thiocyanate. Transfer quantitatively to a 1000ml one-mark volumetric flask (5.2) and dilute to the mark with water. Standardize the solution to the nearest 0,0001mol/l against the silver nitrate solution (4.5) using the am
22、monium iron(III) sulfate solution (4.7) as indicator. 4.7 Ammonium iron(III) sulfate Prepare a saturated aqueous solution at room temperature from the dodecahydrate NH 4 Fe(SO 4 ) 2 12H 2 2O 5 Apparatus Usual laboratory apparatus and, in particular, the following. 5.1 Homogenizing equipment, mechani
23、cal or electrical, capable of homogenizing the test sample. This includes a high-speed rotational cutter, or a mincer fitted with a plate with holes not exceeding4,5mm in diameter. 5.2 One-mark volumetric flasks, of capacity 1 000ml and 200ml. 5.3 Conical flasks, of capacity about 250ml. 5.4 Burette
24、, of capacity 25ml or 50ml. 5.5 One-mark pipettes, of capacity 20ml. 5.6 Boiling water bath. 5.7 Analytical balance, capable of weighing to an accuracy of 0,001g. 6 Sampling It is important that the laboratory receive a sample which is truly representative and has not been damaged or changed during
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