BS 6092-12-1981 Methods of sampling and test for sodium and potassium silicates for industrial use - Limit test for sulphate content of sodium metasilicate《工业用硅酸钠和硅酸钾取样和试验方法 第12部分 .pdf

1、BRITISH STANDARD BS 6092-12: 1981 Methods of Sampling and test for sodium and potassium silicates for industrial use Part 12: Limit test for sulphate content of sodium metasilicate NOTEIt is recommended that this Part be read in conjunction with the information in the “General introduction” publishe

2、d separately as BS 6092-0. UDC 661.683/.684:546.32284 + 546.33284:543.061:546.226BS6092-12:1981 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authorityofthe Executive Board and comes into effect on 27February1981 BSI 12-1

3、999 The following BSI references relate to the work on this standard: Committee reference CIC/22 Draft for comment 73/55424 DC ISBN 0 580 12049 X A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct ap

4、plication. 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, an inside back cover and a back cover. This standard has been updated (see copyright

5、date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS6092-12:1981 BSI 12-1999 i Contents Page 1 Scope 1 2 References 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 P

6、rocedure 1 7 Expression of results 1 Publications referred to Inside back coverii blankBS6092-12:1981 BSI 12-1999 1 1 Scope This Part of BS6092describes a limit test for determining the compliance with the sulphate limit specified in BS3984for the Services grade of this material. NOTEThis limit is e

7、quivalent to a sulphate content, expressed as a percentage by mass of sodium sulphate (Na 2 SO 4 ), of 0.21. There is no International Standard corresponding to this Part of BS 6092. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Princ

8、iple The turbidity produced by reacting a solution of the test portion with barium chloride solution is compared visually with that similarly produced by a standard sulphate solution. 4 Reagents The following reagents are required and shall be of recognized analytical quality. Water complying with t

9、he requirements of BS3978shall be used throughout. 4.1 Dimethylformamide. WARNING. Toxic and irritant. Avoid breathing vapour. Avoid contact with skin and eyes. 4.2 Hydrochloric acid, approximately5N solution. 4.3 Barium sulphate reagent. Mix15ml of0.5M barium chloride solution,55ml of water, and20m

10、l of sulphate-free ethanol 95% (V/V). Add5ml of a0.181g/l solution of potassium sulphate; dilute to100ml with water and mix thoroughly. Prepare this reagent freshly for each series of tests. 4.4 Standard sulphate solution. Dilute2.8ml of0.1N sulphuric acid solution to1000ml with water and mix thorou

11、ghly. 5 Apparatus Ordinary laboratory apparatus and the following are required. Matched Nessler cylinders, 50 ml capacity complying with the requirements of BS612. 6 Procedure 6.1 Test portion. Weigh, to the nearest0.01g,1g of the sample. 6.2 Test. Dissolve the test portion (6.1) in about25ml of wat

12、er, heating if necessary to complete the dissolution. Cool the solution to room temperature. Add5ml of the dimethylformamide(4.1) followed by8ml of the hydrochloric acid solution (4.2) and mix. A clear solution should be obtained. Transfer the solution quantitatively to a100ml one-mark volumetric fl

13、ask, dilute to the mark with water, and mix thoroughly. Transfer25ml of this solution to one of the Nessler cylinders. Transfer25ml of the standard sulphate solution(4.4) to the second Nessler cylinder and add2ml of the hydrochloric acid solution (4.2). To each cylinder add15ml of water and5ml of th

14、e barium sulphate reagent (4.3) and dilute to50ml with water. Stir both solutions thoroughly with glass rods, and allow them to stand for5min. Compare the turbidities produced in the two cylinders. 7 Expression of results Report whether or not the turbidity produced in the sample solution exceeds th

15、at produced in the standard sulphate solution.2 blankBS6092-12:1981 BSI 12-1999 Publications referred to BS 612, Nessler cylinders. BS 3978, Water for laboratory use. BS 6092-12: 1981 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body respons

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