BS-7319-4-1990 ISO-2480-1972.pdf
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1、BRITISH STANDARD BS 7319-4: 1990 ISO 2480:1972 Analysis of sodium chloride for industrial use Part 4: Method for determination of sulphate content Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:34:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7319-4:1990
2、This British Standard, having been prepared under the direction of the Chemicals Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 1990 BSI 12-1999 The following BSI references relate to the work on this standard: Committee refere
3、nces CIC/22, FAC/23 Draft for comment 88/55617 DC ISBN 0 580 18533 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/22, upon which the following bodies were represe
4、nted: British Association for Chemical Specialities Chemical Industries Association Man-made Fibres Producers Committee Soap and Detergent Industry Association Textile Research Council (FCRA) The following bodies were also represented in the drafting of the standard, through Technical Committee FAC/
5、23: AFRC Institute of Food Research Creamery Properietors Association Department of Trade and Industry (Laboratory of the Government Chemist) Food and Drink Federation Milk Marketing Board for Northern Ireland Royal Association of British Dairy Farmers Salt Manufacturers Association Amendments issue
6、d since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:34:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7319-4:1990 BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Field of
7、application1 3Reference1 4Principle1 5Reagents1 6Apparatus1 7Procedure1 8Expression of results2 9Special case: Determination of sulphate in a principal solution prepared in an acid medium2 10Test report2 Publication(s) referred toInside back cover Licensed Copy: London South Bank University, London
8、South Bank University, Fri Dec 08 13:34:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7319-4:1990 ii BSI 12-1999 National foreword BS 7319 has been prepared under the direction of the Chemicals Standards Policy Committee, at the request of Technical Committee FAC/23, Salt, primarily to provide ap
9、propriate methods for determination of vacuum salt for food use as specified in BS 998:1990. The methods for determination were previously published as appendices to BS 998:1969. A list of the Parts of BS 7319 is given in Part 1. This Part of BS 7319 is identical with ISO 2480:1972 “Sodium chloride
10、for industrial use Determination of sulphate content Barium sulphate gravimetric method” published by the International Organization for Standardization (ISO). It supersedes Appendix J of BS 998:1969, which is withdrawn. Additional information Reagents. With reference to clause 5, the reagents used
11、should be of recognized analytical grade; water complying with grade 3 of BS 3978 is suitable. Units relating to concentration. The units used in this standard are based on normality (N). The corresponding values, expressed as amounts of substance concentrations, are as follows. Sampling. It is reco
12、mmended that test samples should be taken in accordance with BS 5309-4. Calculation of results on a moisture free basis. The sulphate content, expressed as sodium sulphate (Na2SO4) in milligrams per kilogram on a moisture free basis, is calculated by multiplying the result obtained in accordance wit
13、h 8.1 by where H is the moisture content in % (m/m) determined in accordance with BS 7319-2. 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 no
14、t of itself confer immunity from legal obligations. Cross-reference International StandardCorresponding British Standard ISO 2479:1972BS 7319 Analysis of sodium chloride for industrial use Part 3:1990 Method for determination of matter insoluble in water or in acid (Identical) ClauseAs printedExpres
15、sed as amounts of substance concentration 5.16 Nc(HCl) = 6.0 mol/L 5.112 Nc(HCl) = 12.0 mol/L 5.236 Nc(H2SO4) = 18.0 mol/L 5.3Nc(BaCl2) = 0.50 mol/L 5.514 Nc(HNO3) = 14.00 mol/L 106 100H - Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, a
16、n 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. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:34:06
17、GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7319-4:1990 BSI 12-19991 1 Scope This International Standard specifies a gravimetric method for the determination of sulphate content of sodium chloride for industrial use. 2 Field of application 2.1 General case The method is applicable to the determina
18、tion of sulphate soluble in water, in sodium chloride for industrial use. 2.2 Special case Determination of sulphate in a principal solution prepared in an acid medium. NOTEWhatever the conditions adopted, all related determinations shall be carried out in the same medium, except the determination o
19、f chlorides which shall always be carried out in an aqueous solution. 3 Reference ISO 2479, Sodium chloride for industrial use Determination of matter insoluble in water or acid and preparation of principal solutions for other determinations. 4 Principle Dissolution of a test portion and separation
20、of the insoluble residue. Precipitation of the sulphate ions as barium sulphate in a boiling acid medium. Filtration, washing and ignition of the precipitate. Weighing of the barium sulphate. 5 Reagents Distilled water or water of equivalent purity shall be used in the test. 5.1 Hydrochloric acid, a
21、pproximately 6 N solution. Dilute 50 ml of hydrochloric acid, 1,19 g/ml (approximately 38 % (m/m) solution, or approximately 12 N), to 100 ml. 5.2 Sulphuric acid, 1,84 g/ml (approximately 96 % (m/m) solution or approximately 36 N). 5.3 Barium chloride, approximately N solution. Dissolve 122 g of bar
22、ium chloride dihydrate in water in a 1 000 ml one-mark volumetric flask, dilute to the mark and mix. 5.4 Silver nitrate, 5 g/l nitric solution. Dissolve 0,5 g of silver nitrate in a little water, add 10 ml of nitric acid solution, 1,40 g/ml approximately, and dilute to 100 ml. 5.5 Nitric acid 1,40 g
23、/ml (approximately 68 % (m/m) solution, or approximately 14 N). 6 Apparatus Ordinary laboratory apparatus and 6.1 Electric furnace, capable of being controlled at 800 25 C. 6.2 Desiccator, containing pumice moistened with sulphuric acid, silica gel, or phosphorus pentoxide. 6.3 Platinum or porcelain
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