1、BRITISH STANDARD BS 6092-5: 1981 ISO 1692:1976 Methods of Sampling and test for sodium and potassium silicates for industrial use Part 5: Determination of total alkali content ISO title: Sodium and potassium silicates for industrial use Determination of total alkalinity Titrimetric method NOTEIt is
2、recommended that this Part be read in conjunction with the information in the “General introduction” published separately as BS6092-0. UDC 661.683/.684:546.32284 + 546.33284:543.241.2BS6092-5:1981 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, wa
3、s published under the authority ofthe Executive Board and comesinto effect on 27February1981 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference CIC/22 Draft for comment 73/55424 DC ISBN 0 580 12039 2 Amendments issued since publication Amd. No. Date of
4、issue CommentsBS6092-5:1981 BSI 12-1999 i Contents Page National foreword ii 1 Scope and field of application 1 2 References 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Procedure 1 7 Expression of results 1 8 Accuracy of the method 1 9 Test report 1 Annex ISO publications relating to sodium and pot
5、assium silicates for industrial use 2 Publications referred to Inside back coverBS6092-5:1981 ii BSI 12-1999 National foreword This Part of BS6092 is identical with ISO1692 “Sodium and potassium silicates for industrial use Determination of total alkalinity Titrimetric method”, published in1976 by t
6、he International Organization for Standardization (ISO). 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 St
7、andards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they
8、 should be read as “British Standard”. There is no British Standard corresponding directly to ISO1686 to which reference is made in6.1. Technically equivalent information on sampling is given in BS6092-0. The standards listed in the Annex are intended for information only. Corresponding British Stan
9、dards are listed in BS6092-0. Additional information Water complying with the requirements of clause4 is specified in BS3978 “Water for laboratory use”. In the revised edition of BS3984:1966 “Specification for sodium silicates” details will be given of the volume of sample solution required to give
10、a titration reading of about20ml (see6.3). 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 not of itself confer immunity from legal obligations
11、. Cross-references International Standard Corresponding British Standard BS 6092 Methods of sampling and test for sodium and potassium silicates for industrial use ISO 1690:1976 Part 3:1981 Determination of silica content (gravimetric method) (Identical) ISO 2122:1972 Part 6:1981 Preparation of solu
12、tions of not readily soluble products and determination of matter insoluble in water (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and
13、 may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6092-5:1981 BSI 12-1999 1 1 Scope and field of application This International Standard specifies a titrimetric method for the determination of the total alkalinity of sodium and potassium
14、 silicates for industrial use. 2 References ISO 1686, Sodium and potassium silicates for industrial use Samples and methods of test General. ISO 1690, Sodium and potassium silicates for industrial use Determination of silica content Gravimetric method by insolubilization. ISO 2122, Sodium and potass
15、ium silicates for industrial use Preparation of solutions of products not easily soluble in boiling water and determination of matter insoluble in water. 3 Principle Titration of the total alkalinity of a test portion with a standard volumetric solution of hydrochloric acid, in the presence of methy
16、l orange as indicator. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Hydrochloric acid, 1N standard volumetric solution. 4.2 Methyl orange, 0,5g/l solution. NOTEThe methyl orange may be replaced by any oth
17、er indicator having the end-point in the same pH range. 5 Apparatus Ordinary laboratory apparatus. 6 Procedure 6.1 Test portion Weigh, to the nearest0,01g,10 1g of the test sample (seeISO1686). NOTE 1Where the silica content is also to be determined, the test portion will be constituted by the aliqu
18、ot of the test solution prepared according to ISO1690. NOTE 2In the case of products not easily soluble in boiling water, the test sample will be constituted by the test solution prepared according to ISO2122. 6.2 Preparation of test solution Place the test portion (6.1) in a250ml one-mark volumetri
19、c flask, dissolve with water, dilute to the mark and mix. 6.3 Determination Take a volume of the sample solution (6.2) such that the volume of the standard volumetric hydrochloric acid solution (4.1) required to neutralize it is about20ml. Add 5 drops of the methyl orange solution (4.2) and titrate
20、with the standard volumetric hydrochloric acid solution until the indicator changes from yellow to orange-pink. 7 Expression of results The total alkalinity, expressed as a percentage by mass of sodium oxide (Na 2 O) or of potassium oxide (K 2 O), as appropriate, is given by the formulae Sodium oxid
21、e (in the case of sodium silicates) Potassium oxide (in the case of potassium silicates) where V is the volume, in millilitres, of the standard volumetric hydrochloric acid solution (4.1) used for the titration; m is the mass, in grams, of the test portion (or the mass, in grams, of test portion con
22、tained in the aliquot part of the test solution (5.2) used); 0,0310is the mass, in grams, of sodium oxide corresponding to1ml of exactly1N hydrochloric acid solution; 0,0471is the mass, in grams, of potassium oxide corresponding to1ml of exactly1N hydrochloric acid solution. NOTEIf the concentration
23、 of the standard volumetric solution used is not exactly as specified in the list of reagents, an appropriate correction shall be made. 8 Accuracy of the method The results obtained using this method are reproducible to the nearest 0,2% (m/m), in absolute value. 9 Test report The test report shall i
24、nclude the following particulars: a) the reference of the method used; b) the results and the method of expression used; c) any unusual features noted during the determination; d) any operations not included in this International Standard or the International Standards to which reference is made, or
25、 regarded as optional. V 100 m -0,031 03,10 V m - = V 100 m -0,047 14,71 V m - = BS6092-5:1981 2 BSI 12-1999 Annex ISO Publications relating to sodium and potassium silicates for industrial use ISO 1686, Samples and methods of test General. ISO 1687, Determination of density at20 C of samples in sol
26、ution Method using density hydrometer and method using pyknometer. ISO 1688, Determination of dry matter Gravimetric method. ISO 1689, Calculation of the ratio or . ISO 1690, Determination of silica content Gravimetric method by insolubilization. ISO 1691, Determination of carbonate content Gas-volu
27、metric method. ISO 1692, Determination of total alkalinity Titrimetric method. ISO 2122, Preparation of solution of products not easily soluble in boiling water and determination of matter insoluble in water. ISO 2123, Determination of dynamic viscosity. ISO 2124, Determination of silica content Tit
28、rimetric method. ISO 3200, Determination of sulphate content Barium sulphate gravimetric method. ISO 3201, Determination of iron content 1,10-Phenanthroline photometric method. SiO 2 Na 2 O - SiO 2 K 2 O -BS6092-5:1981 BSI 12-1999 Publications referred to See national foreword.BS 6092-5: 1981 ISO 16
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