1、BRITISH STANDARD BS 6092-10: 1981 Methods of Sampling and test for sodium and potassium silicates for industrial use Part 10: Determination of matter insoluble in water NOTEIt is recommended that this Part be read in conjunction with the information in the “General introduction” published separately
2、 as BS6092-0. UDC 661.683/.684:546.32284 + 546.33284:543.725BS6092-10:1981 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authorityofthe Executive Boardand comes into effect on 27February1981 BSI 12-1999 The following BSI
3、references relate to the work on this standard: Committee reference CIC/22 Draft for comment 73/55424 DC ISBN 0 580 12044 9 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
4、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 date) and may have had
5、 amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS6092-10:1981 BSI 12-1999 i Contents Page 1 Scope 1 2 References 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Procedure 1 7 Expressio
6、n of results 1 Publications referred to Inside back coverii blankBS6092-10:1981 BSI 12-1999 1 1 Scope This Part of BS6092 describes a method of test for determining the matter insoluble in water for sodium and potassium silicates for industrial use. It is particularly applicable to sodium metasilica
7、te pentahydrate, but may be used for other silicates that are easily soluble in water. There is no International Standard corresponding to this Part of BS6092. NOTEBS 6092-6 specifies a method for the determination of matter insoluble in water for sodium and potassium silicates that are not easily s
8、oluble in boiling water. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Principle A solution of the test portion in carbon dioxide-free water is filtered through a tared filter crucible and the mass of the water-insoluble residue is ob
9、tained. 4 Reagents The following reagents are required and shall be of recognized analytical quality. Water complying with the requirements of BS3978, freshly boiled to free it from carbon dioxide, shall be used throughout. 4.1 Phenolphthalein indicator, 1% (m/V) solution in aqueous ethanol. Dissolv
10、e1g of phenolphthalein in60ml of95% (V/V) ethanol and dilute to100ml with water. 5 Apparatus Ordinary laboratory apparatus and the following are required. 5.1 Oven, capable of being controlled within the temperature range100 C to 105 C. 5.2 Crucible, sintered glass or porous porcelain, of porosity g
11、rade3, complying with the requirements of BS1752. 6 Procedure 6.1 Test portion. Weigh, to the nearest0.1g, about25 g of the sample. 6.2 Determination. Transfer the test portion(6.1) to a400ml beaker. Add250ml of water and warm, if necessary, until dissolution of all soluble matter is complete. Allow
12、 to stand for1h and filter the solution through the sintered glass or porous porcelain crucible (5.2) previously dried for1h in the oven (5.1) controlled at100 C to 105 C and weighed to the nearest milligram, transferring any insoluble matter from the beaker to the crucible with a jet of water. Wash
13、 the filter with5ml portions of water until the filtrate is no longer alkaline to the phenolphthalein indicator (4.1). Dry the crucible in the oven (5.1) controlled at100 C to105 C, for1h, allow it to cool in a desiccator and weigh to the nearest milligram. 7 Expression of results The matter insolub
14、le in water, expressed as a percentage by mass, is given by the formula: where m 0 is the mass of the test portion, ing; m 1 is the mass of the matter insoluble in water, ing. m 1 m 0 -100 2 blankBS6092-10:1981 BSI 12-1999 Publications referred to BS 1752, Laboratory sintered or fritted filters. BS
15、3978, Water for laboratory use. BS 6092, Methods of sampling and test for sodium and potassium silicates for industrial use. BS 6092-6, Preparation of solutions of not readily soluble products and determination of matter insoluble in water. BS 6092-10: 1981 BSI 389 Chiswick High Road London W4 4AL B
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