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1、BRITISH STANDARD BS 6075-1: 1981 ISO 979:1974 Methods of Sampling and test for sodium hydroxide for industrial use Part 1: Determination of sodium hydroxide content ISO title: Sodium hydroxide for industrial use Method of assay NOTEIt is recommended that this Part be read in conjunction with the inf
2、ormation in the “General introduction” published separately as BS 6075-0. UDC 661.322.1:546.33 36:543.79:543.241.2 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6075-1:1981 This British Standard, having been prepared under the direction
3、 of the Chemicals Standards Committee, was published under the authority of the Executive Board and comes into effect on 27 February 1981 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CIC/22 Draft for comment 73/54863 DC ISBN 0 580 12051 1 National
4、 foreword This Part of BS 6075 is identical with ISO 979 “Sodium hydroxide for industrial use Method of assay”, published in 1974 by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publica
5、tion as a British Standard without deviation. Some 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
6、full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. 50 ml, class A pipettes complying with the requirements of BS 1583:1961 “One-mark pipettes” and 50 ml burettes, class A complyi
7、ng with the requirements of BS 846:1980 “Burettes and bulb burettes”, are technically equivalent to the apparatus specified in 5.1 and 5.2, respectively. Additional information Water. Water complying with the requirements of clause 4 is specified in BS 3978 “Water for laboratory use”. A British Stan
8、dard 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. Summary of pages This document comprises a front cover,
9、 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 amendments incorporated. This will be indicated in the amendment table on the inside front cover. Cross-references International Standard
10、Corresponding British Standard BS 6075 Methods of sampling and test for sodium hydroxide for industrial use ISO 3195:1975Part 5:1981 Sampling and preparation of main test solution (Identical) ISO 3196:1975Part 6:1981 Determination of carbonate content (Identical) Amendments issued since publication
11、Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6075-1:1981 BSI 10-1999i Contents Page National forewordInside front cover 1Scope and field of application1 2References1 3Principle1 4Reagents1 5Apparatus1 6Pro
12、cedure1 7Expression of results1 8Test report1 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:16 GMT+00:00 2006, Uncontrolled Cop
13、y, (c) BSI BS 6075-1:1981 BSI 10-19991 1 Scope and field of application This International Standard specifies a method of assay of sodium hydroxide for industrial use. This assay can be expressed conventionally, as percentages by mass of NaOH, in two different ways: A total alkalinity (NaOH equiv.);
14、 B caustic alkalinity (NaOH c.), corresponding to the total alkalinity less the alkalinity due to carbonates. 2 References ISO 3195, Sodium hydroxide for industrial use Sampling Test sample Preparation of the main solution for carrying out certain determinations1). ISO 3196, Sodium hydroxide for ind
15、ustrial use Determination of carbonates content Titrimetric method1). 3 Principle Titration of the total alkalinity with standard volumetric hydrochloric acid solution in the presence of methyl orange as indicator. Calculation of the two amounts A and B defined in clause 1. 4 Reagents During the ana
16、lysis, use only reagents of recognized analytical reagent grade, and only distilled water or water of equivalent purity. 4.1 Hydrochloric acid, N standard volumetric solution. 4.2 Methyl orange, 0,5 g/l solution. 5 Apparatus Ordinary laboratory apparatus and 5.1 Pipette, 50 ml, accurate to 0,05 ml (
17、see ISO/R 648, class A). 5.2 Burette, 50 ml (see ISO/R 385, class A), with tapered jet, permitting a delivery of about 30 drops per millilitre. 6 Procedure 6.1 Test portion Transfer 50,0 ml of the main solution A2) , by means of the pipette (5.1), to a 500 ml conical flask. 6.2 Titration Add about 5
18、0 ml of water and 5 drops of the methyl orange solution (4.2) to the conical flask containing the test portion (6.1) and titrate with the standard volumetric hydrochloric acid solution (4.1) contained in the burette (5.2) until the colour changes from yellow to orange. 7 Expression of results 7.1 To
19、tal alkalinity (NaOH equiv.) The total alkalinity (A), expressed as a percentage by mass of sodium hydroxide (NaOH), is given by the formula where The result should be expressed to one decimal place. 7.2 Caustic alkalinity (NaOH c.) The caustic alkalinity (B), expressed as a percentage by mass of so
20、dium hydroxide (NaOH), is given by the formula B = A 1,818 b where The results should be expressed to one decimal place. 8 Test report The test report shall include the following particulars: a) the reference of the method used; b) the results and the method of expression used; 1) At present at the
21、stage of draft. 2) See 4.3 of ISO 3195. 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 used for the preparation of the main solution Aa. a See 4.3 of ISO 3195. A is the total alkalinity
22、 (7.1), expressed as a percentage by mass of sodium hydroxide (NaOH); b is the carbonates content, expressed as a percentage by mass of carbon dioxide (CO2) determined by the method specified in ISO 3196; 1,818 is the conversion factor of CO2 to 2NaOH. AV 1 000 50 - 100 m - -0 040 00,80 V m - -= Lic
23、ensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6075-1:1981 2 BSI 10-1999 c) any unusual features noted during the determination; d) any operation not included in this International Standard or the International Standards to which reference
24、is made, or regarded as optional. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6075-1:1981 BSI 10-1999 Publications referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:09:16 GMT+00:00 2006, Unco
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