BS-6092-1-1981 ISO-1687-1976.pdf
《BS-6092-1-1981 ISO-1687-1976.pdf》由会员分享,可在线阅读,更多相关《BS-6092-1-1981 ISO-1687-1976.pdf(10页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 6092-1: 1981 ISO 1687:1976 Methods of Sampling and test for sodium and potassium silicates for industrial use Part 1: Determination of solution density at 20 C ISO title: Sodium and potassium silicates for industrial use Determination of density at 20 C of products in solution Me
2、thod using density hydrometer and method using pyknometer NOTEIt is recommended that this Part be read in conjunction with the information in the “General introduction” published separately as BS 6092-0. UDC 661.683/.684:546.32284 + 546.33284:531.756 Licensed Copy: sheffieldun sheffieldun, na, Wed D
3、ec 06 14:09:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6092-1:1981 This British Standard, having been prepared under the direction of the Chemicals Standards Committee, was published under the authority of the Executive Board and comes into effect on 27 February 1981 BSI 12-1999 The following
4、BSI references relate to the work on this standard: Committee reference CIC/22 Draft for comment 73/55424 DC ISBN 0 580 12036 8 National foreword This Part of BS 6092 is identical with ISO 1687 “Sodium and potassium silicates for industrial use Determination of density at 20 C of products in solutio
5、n Method using density hydrometer and method using pyknometer”, published in 1976 by the 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. So
6、me terminology and certain conventions are not identical with those used in British Standards; 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
7、. Where the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Cross-references There is no British Standard corresponding directly to IS0 1686 to which reference is made in 4.3. Technically equivalent information on sampling is given in BS
8、6092-0. The standards listed in the Annex are intended for information only. Corresponding British Standards are listed in BS 6092-0. Additional information Water. Water complying with the requirements of 4.3 is specified in BS 3978 “Water for laboratory use”. A British Standard does not purport to
9、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. Summary of pages This document comprises a front cover, an inside front cover, p
10、ages i and ii, pages 1 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. Amendments issued since publication Amd. No.Date of issueComments
11、 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6092-1:1981 BSI 12-1999i Contents Page National forewordInside front cover 1Scope and field of application1 2Reference1 3Method using density hydrometer1 4Method using pyknometer1 5Test rep
12、ort2 Annex ISO Publications relating to sodium and potassium silicates for industrial use3 Figure 1 Ordinary pyknometer2 Figure 2 Wide-neck pyknometer2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
13、 ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6092-1:1981 BSI 12-19991 1 Scope and field of application This International Standard specifies two methods for the determination of the density at 20 C of sodium and potassium sil
14、icates for industrial use. The two methods specified are the method using a density hydrometer and the method using a pyknometer; the latter is to be preferred in the case of dispute or of high viscosity solutions. 2 Reference ISO 1686, Sodium and potassium silicates for industrial use Samples and m
15、ethods of test General. 3 Method using density hydrometer 3.1 Principle Determination of the density at 20 C of a test sample by using a hydrometer. 3.2 Apparatus 3.2.1 Measuring cylinders, having an effective capacity of 500 ml and an outside diameter of approximately 50 mm. 3.2.2 Set of density hy
16、drometers, preferably having the following characteristics: nominal range of individual scales: 0,100 g/ml; scale subdivisions: 50 0,002 g/ml; maximum scale error at the temperature of test: 0,002 g/ml; overall length: 250 mm; length of scale (overall nominal range): 85 mm; bulb diameter: 18 to 20 m
17、m. 3.2.3 Thermometer, which allows a temperature of 20 C to be measured to 0,5 C. 3.3 Procedure Adjust the temperature of approximately 500 ml of the test sample (see ISO 1686) to 20 0,5 C. Pour this sample into the measuring cylinder (3.2.1), containing the thermometer (3.2.3), and then slowly inse
18、rt the appropriate hydrometer selected from the set described in 3.2.2. Ensure that the temperature of the liquid is between 19,5 and 20,5 C and remove the thermometer. When the hydrometer has reached its equilibrium position, depress it slightly, wait for its return to the equilibrium position, and
19、 record the graduation mark. 3.4 Expression of results The reading of the hydrometer is the density of the sample, expressed in grams per millilitre. Express the result to the nearest 0,01 g/ml. 3.5 Accuracy of the method Experience has shown that the accuracy of this method is within 0,02 g/ml. 4 M
20、ethod using pyknometer 4.1 Principle Measurement of the mass, at 20 C, of the volume of test sample contained in a pyknometer. Determination of this volume by measuring the corresponding mass of water at 20 C. Calculation of the ratio of the mass of the sample to its volume. 4.2 Apparatus Ordinary l
21、aboratory apparatus and 4.2.1 Ordinary pyknometer (see Figure 1), or wide-neck pyknometer, (see Figure 2) the channel of the stopper not being a capillary tube, of capacity 50 ml. 4.2.2 Water bath, capable of being controlled at 20 0,5 C. 4.3 Procedure Clean and dry the pyknometer (4.2.1) together w
22、ith its stopper and weigh the stoppered pyknometer to the nearest 0,001 g. Fill the pyknometer with distilled water boiled and cooled to 20 0,5 C, and place it in the water bath (4.2.2) controlled at 20 0,5 C. Allow at least 10 min for the temperature to reach equilibrium and remove the pyknometer f
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS-6092-1-1981 ISO-1687-1976 BS 6092 1981 ISO 1687 1976
链接地址:https://www.31doc.com/p-3771080.html