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1、BRITISH STANDARD BS 3483-C3: 1982 ISO 787-4: 1981 Methods for Testing pigments for paints Part C3: Determination of acidity or alkalinity of the aqueous extract ISO title: General methods of test for pigments and extenders Part 4: Determination of acidity or alkalinity of the aqueous extract This Pa
2、rt should be read in conjunction with the General Introduction to BS 3483 issued separately. UDC 667.622:543.241.056 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C3:1982 This British Standard, having been prepared under the direct
3、ion of the Pigments, Paints and Varnishes Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1982 BSI 12-1999 First published March 1974 First revision November 1982 The following BSI references relate to the work on this standard: Committ
4、ee reference PVC/1 Draft for comment 80/50280 DC ISBN 0 580 12940 3 Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C3:1982 BSI 12-1999i Contents Page National forewor
5、dii 0Introduction1 1Scope and field of application1 2References1 3Reagents1 4Apparatus1 5Sampling1 6Procedure1 7Expression of results2 8Test report2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
6、 3483-C3:1982 ii BSI 12-1999 National foreword This revision of Part C3 of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO 787-4 “General methods of test for pigments and extenders Part 4: Determination of acidity or a
7、lkalinity of the aqueous extract” published in 1981 by the International Organization for Standardization (ISO). This Part of BS 3483 supersedes BS 3483-C3:1974 which is withdrawn. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a
8、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 full point
9、 on the baseline as the decimal marker. Wherever the words “This part of ISO 787” and “International Standard” appear, referring to this standard, they should be read as “This Part of BS 3483” and “British Standard” respectively. The Technical Committee has reviewed the provisions of ISO/R 385, to w
10、hich reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard for ISO/R 385 was BS 846:19621). Additional information. In 6.2.3 of ISO 787-4:1981, it is stated that the procedure (clause 6) is to be repeated if the
11、results of the duplicate determinations differ by more than 5 % of the higher value. In implementing this standard in the United Kingdom, it is recommended that, if repeat determinations are necessary, wherever possible both the sampling (clause 5) and the procedure (clause 6) should be repeated.2)
12、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. Summary of pages This document comprises
13、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 amendments incorporated. This will be indicated in the amendment table on the inside front cover. Cross-references Internat
14、ional StandardCorresponding British Standard BS 3483 Methods for testing pigments for paints ISO 787-3:1979Part C1:1980 Determination of matter soluble in water (hot extraction method) (Identical) ISO 787-8:1979Part C2:1980 Determination of matter soluble in water (cold extraction method) (Identical
15、) ISO 842:1974BS 4726:1971 Method for sampling raw materials for paints and varnishes (Technically equivalent) 1) Now withdrawn, having been superseded by BS 846:1980 “Specification for burettes”. 2) This change has been reported to the ISO in a proposal to amend the International Standard. Licensed
16、 Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C3:1982 BSI 12-19991 0 Introduction This document is a part of ISO 787, General methods of test for pigments and extenders. 1 Scope and field of application This part of ISO 787 specifies a gen
17、eral method of test for determining the acidity or alkalinity of the aqueous extract of a sample of pigment or extender. NOTEWhen this general method is applicable to a given pigment or extender, only a cross-reference to it should be included in the International Standard relating to that pigment o
18、r extender, with a note of any detailed modification which may be needed in view of the special properties of the material in question. Only when this general method is not applicable to a particular material should a special method for determination of acidity or alkalinity be specified. 2 Referenc
19、es ISO/R 385, Burettes. ISO 787, General methods of test for pigments and extenders Part 3: Determination of matter soluble in water Hot extraction method Part 8: Determination of matter soluble in water Cold extraction method. ISO 842, Raw materials for paints and varnishes Sampling. 3 Reagents Dur
20、ing the analysis use only reagents of recognized analytical grade and only distilled water or water of at least equivalent purity. 3.1 Hydrochloric acid, standard volumetric solution, c(HCl) = 0,05 mol/l. 3.2 Sodium hydroxide, standard volumetric solution, c(NaOH) = 0,05 mol/l, or potassium hydroxid
21、e, standard volumetric solution, c(KOH) = 0,05 mol/l. For method A: 3.3 Methyl red indicator, 1 g/l solution in 60 % (V/V) ethanol. 4 Apparatus Ordinary laboratory apparatus and 4.1 Burette, of capacity 50 ml, complying with the requirements of ISO/R 385. For method B: 4.2 pH measuring device, capab
22、le of measurement to 0,1 unit, calibrated against buffer solutions of known pH value at the temperature of the test. 5 Sampling Take a representative sample of the material to be tested as described in ISO 842. 6 Procedure Carry out the determination in duplicate. 6.1 Test solution Follow the proced
23、ure specified in ISO 787-3, to the stage of obtaining a perfectly clear filtrate. NOTEIf agreed or specified, the procedure described in ISO 787-8 (cold extraction method) may be followed. In this case, the period of stirring should be reduced to 5 min. 6.2 Determination NOTEIf the filtrate is colou
24、red the use of the indicator (6.2.1) is not suitable. The potentiometric method (6.2.2) should be used. 6.2.1 With indicator solution (method A) Add 5 drops of the methyl red indicator (3.3) to 100 ml of the test solution (6.1). If the solution is orange, consider it as being neutral. If the solutio
25、n is yellow (alkaline), titrate it with the hydrochloric acid solution (3.1) to an orange end-point. If the solution is red (acid), titrate it with the sodium or potassium hydroxide solution (3.2) to an orange end-point. NOTEBy agreement between the parties, another colour indicator can be used. 6.2
26、.2 Potentiometric determination (method B) Take 100 ml of the test solution (6.1), insert the electrodes of the pH measuring device and read the pH value. If the pH value is between 4 and 8, consider the solution as being neutral. If the pH value is more than 8 (alkaline), titrate the solution with
27、the hydrochloric acid solution (3.1) to a pH value just less than 8. If the pH value is less than 4 (acid), titrate the solution with the sodium or potassium hydroxide solution (3.2) to a pH value just more than 4. 6.2.3 Repeat determinations 3)If the results of the duplicate determinations differ b
28、y more than 5 % of the higher value, the procedure (clause 6) should be repeated. 3) See the paragraph headed “Additional information” in the national foreword. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C3:1982 2 BSI 12-1999 7
29、Expression of results 7.1 Calculation Calculate the acidity (alkalinity) by the equation where Ais the acidity (alkalinity) expressed as millilitres of 0,1 mol/l alkali (hydrochloric acid) solution required to neutralise the extract of 100 g of product; mis the mass, in grams, of the sample taken to
30、 prepare the test solution (6.1); Vis the volume, in millilitres, of the sodium or potassium hydroxide solution (3.2) or hydrochloric acid solution (3.1). If the extract is neutral, report the result as “neutral”. For titrimetric measurements report the mean of the two determinations. 7.2 Precision
31、No precision data are currently available. 8 Test report The test report shall contain at least the following information: a) the type and identification of the product tested; b) a reference to this International Standard (ISO 787-4); c) the result of the test as indicated in clause 7; d) any devia
32、tion, by agreement or otherwise, from the procedure specified; e) the date of the test. A V2,5100 2m - -= 125 V m - -= Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C3:1982 BSI 12-1999 Publications referred to See the national fore
33、word. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C3: 1982 ISO 787-4: 1981 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standard
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