1、BRITISH STANDARD BS EN ISO 2495:2001 BS 283:1995 Incorporating Amendment No. 1 to BS 283:1995 (renumbers the BS as BS EN ISO 2495:2001) Specification for Iron blue pigments The European Standard EN ISO 2495:2000 has the status of a British Standard ICS 87.060.10 NO COPYING WITHOUT BSI PERMISSION EXC
2、EPT AS PERMITTED BY COPYRIGHT LAWBS EN ISO 2495:2001 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 November 1995 BSI 06-2001 The following BSI refer
3、ences relate to the work on this standard: Committee reference STI/1 Draft announced in BSI News February 1990 ISBN 0 580 24563 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee STI/1, Pigments, upon which the following b
4、odies were represented: British Cement Association British Coatings Federation Ltd. British Colour Makers Association British Precast Concrete Federation Ltd. British Ready Mixed Concrete Association Cement and Concrete Pigment Suppliers Association China Clay Association Oil and Colour Chemists Ass
5、ociation Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No. Date Comments 13110 June 2001 Implementation of the European StandardBS EN ISO 2495:2001 BSI 06-2001 i Contents Page Committees responsible Inside front cover Nationa
6、l foreword ii 1S c o p e 3 2 Normative references 3 3 Definition 3 4 Required characteristics and associated tolerances 3 5 Sampling 4 6 Identification 4 7 Determination of sum of iron (II) and iron (III) ions (basic iron content) and of hexacyanoferrate complex content 5 8 Determination of total ir
7、on content 10 9 Determination of volatile matter 12 10 Ease of dispersion 13 11 Test report 13 Annex A (informative) Decontamination of the waste solutions from the analysis 14 Annex ZA (normative) Normative references to international publications with their relevant European publications 15 Figure
8、 A.1 Apparatus for removal of mercury from waste solutions 14 Table 1 Essential requirements 4 Table 2 Conditional requirements 4BS EN ISO 2495:2001 ii BSI 06-2001 National foreword This British Standard is the official English language version of EN ISO 2495:2000, Iron blue pigments Specifications
9、and methods of test, published by the International Organization for Standardization (ISO). It has been prepared by Technical Committee STI/1. This edition supersedes BS 283:1965 which is withdrawn. The differences between BS 283:1965 and this standard are as follows. a) Some requirements are now es
10、sential and others only conditional. b) There are now no differences between requirements for bronzing and non-bronzing blues. c) Volatile content limits are different. d) Two methods for determination of total iron are now included. e) Determination of the volatile matter at 60 C and 105 C are now
11、included in the standard. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility
12、of the BSI Standards Electronic Catalogue. 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
13、. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN
14、 ISO 2495 March 2000 ICS 87.060.10 English version Iron blue pigments Specifications and methods of test (ISO 2495:1995) Pigments de bleu de Prusse Spcifications et mthodes dessai (ISO 2495:1995) Eisenblau-Pigmente Anforderungen und Prfverfahren (ISO 2495:1995) This European Standard was approved by
15、 CEN on 20 January 2000. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bilbiographical references concerning such national stand
16、ards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official version (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to t
17、he Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United
18、 Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 24
19、95:2000 EEN ISO 2495:2000 BSI 06-2001 2 Foreword The text of the International Standard from Technical Committee ISO/TC 35, Paints and varnishes, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 298, Pigments and ext
20、enders, the Secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2000, and conflicting national standards shall be withdrawn at the latest by September 20
21、00. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
22、 Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN ISO 2495:2000 BSI 06-2001 3 1 Scope This International Standard specifies the requirements and the corresponding methods of test for iron blue pigments. 2 Normative references The following standards contain provisions which, through re
23、ference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying t
24、he most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 385-1:1984, Laboratory glassware Burettes Part 1: General requirements. ISO 648:1977, Laboratory glassware One-mark pipettes. ISO 787-1:1982, General me
25、thods of test for pigments and extenders Part 1: Comparison of colour of pigments. ISO 787-2:1981, General methods of test for pigments and extenders Part 2: Determination of matter volatile at 105 C. ISO 787-3:1979, General methods of test for pigments and extenders Part 3: Determination of matter
26、soluble in water Hot extraction method ISO 787-4:1981, General methods of test for pigments and extenders Part 4: Determination of acidity or alkalinity of the aqueous extract. ISO 787-5:1980, General methods of test for pigments and extenders Part 5: Determination of oil absorption value. ISO 787-1
27、6:1986, General methods of test for pigments and extenders Part 16: Determination of relative tinting strength (or equivalent colouring value) and colour on reduction of coloured pigments Visual comparison method. ISO 842: 1) , Raw materials for paints and varnishes Sampling. ISO 1042:1983, Laborato
28、ry glassware One-mark volumetric flasks. ISO 3696:1987, Water for analytical laboratory use Specification and test methods. ISO 8780-2:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 2: Dispersion using an oscillatory shaking machine. 3 Definition
29、 For the purposes of this International Standard, the following definition applies. 3.1 iron blue pigment a pigment formed by the reaction of iron salts with cyanoferrate(II) or cyanoferrate(III) ions and followed, if necessary, by treatment with oxidizing agents 4 Required characteristics and assoc
30、iated tolerances 4.1 Composition The pigment shall be essentially an iron blue pigment as defined in clause 3. The pigment, after drying as described in 9.1 and examination as described in clauses 7 and 8, shall comply with the following requirements: a) The sum of the iron(II) and iron(III) ions (b
31、asic iron content), together with the iron cyanoferrate complex content expressed as Fe(CN) 6 shall be not less than 70 % (m/m). b) The total iron content (expressed as Fe) shall be not less than 30 % (m/m). 1) To be published. (Revision of ISO 842:1984)EN ISO 2495:2000 4 BSI 06-2001 The pigment, wh
32、en examined by the procedure described in clause 6, shall be free from added colouring matter. NOTE 1 The pigment may contain substances added during manufacture for the purpose of improving the quality or working properties, or both, of the pigment. 4.2 Appearance The material shall be in the form
33、of a soft dry powder or in such a condition that it may be readily reduced thereto by crushing under a palette knife, without grinding action. 4.3 Other characteristics 4.3.1 For iron blue pigments complying with this International Standard, the essential requirements are specified in Table 1 and th
34、e conditional requirements are listed in Table 2. The conditional requirements shall be specified by agreement between the interested parties. 4.3.2 The agreed reference pigment referred to in Table 2 shall comply with the requirements of Table 1. 5 Sampling Take a representative sample of the produ
35、ct to be tested, as described in ISO 842. Table 1 Essential requirements Table 2 Conditional requirements 6 Identification 6.1 Reagents During the analysis, use only reagents of recognized analytical grade and only water of at least grade 3 purity as defined in ISO 3696. WARNING Use the reagents in
36、accordance with the appropriate health and safety regulations. 6.1.1 Sodium hydroxide, 50 g/l solution. 6.1.2 Hydrochloric acid, diluted 1 + 1. Add 1 part by volume of concentrated hydrochloric acid approximately 37 % (m/m), 1,19 g/ml to 1 part by volume of water. 6.2 Apparatus Use ordinary laborato
37、ry apparatus and glassware. Characteristic Unit Requirement Method of test Volatile matter w(VM) % (m/m) 2,0 w(VM) 6,0 See clause 9 Matter soluble in water (hot extraction method) % (m/m) max. 2 ISO 787-3 Acidity or alkalinity of the aqueous extract ml of 0,1 mol/l solution per 100 g of pigment max.
38、 20 ISO 787-4 Characteristic Requirement Method of test Colour Equal to that of the agreed reference pigment (see 4.3.2) to within a tolerance agreed between the interested parties ISO 787-1 Colour on reduction ISO 787-16 Relative tinting strength Ease of dispersion Shall not be inferior to that of
39、the agreed reference pigment (see 4.3.2) See clause 10 Oil absorption value Shall not differ by more than 10 % from the value agreed between the interested parties ISO 787-5EN ISO 2495:2000 BSI 06-2001 5 6.3 Procedure Place approximately 0,1 g of the pigment in a 50 ml beaker and add 15 ml of the so
40、dium hydroxide solution (6.1.1). Heat the beaker until the liquid boils and continue to heat for 5 min. Check that the blue coloration has been completely destroyed by examining the liquid in the beaker against an illuminated white background. Ignore a reddish-brown precipitate which may be formed a
41、s this only indicates the presence of iron(III) hydroxide. NOTE 2 If the blue coloration is not completely destroyed, this indicates the presence of an added pigment that is not iron blue as defined in clause 3. Cool the liquid in the beaker and slowly add the hydrochloric acid (6.1.2) until the liq
42、uid is faintly acid to litmus. Examine the liquid for reformation of the characteristic iron blue coloration. 6.4 Assessment of results Record whether the pigment sample is completely decolorized by treatment with alkali and is reformed on acidification. 7 Determination of sum of iron(II) and iron(I
43、II) ions (basic iron content) and of hexacyanoferrate complex content For the determination of the basic iron content and hexacyanoferrate complex content, two methods are provided. Method A (7.1) shall be used as the referee method in cases of dispute. NOTE 3 It is recommended that mercury be remov
44、ed from the waste solutions before discharge to effluent drains. A suggested procedure is given in Annex A. 7.1 Method A 7.1.1 Principle A test portion is decomposed by cold aqueous potassium hydroxide solution to form insoluble iron hydroxide and soluble potassium hexacyanoferrate(II). The iron hyd
45、roxide is dissolved in hydrochloric acid. The iron(III) is reduced to iron(II) with tin(II) chloride solution and the iron(II) is titrated with potassium dichromate solution, using barium diphenylamine sulfonate as indicator. The potassium cyanoferrate(II) is oxidized to cyanoferrate(III) with potas
46、sium permanganate solution. Then potassium iodide solution is added and the iodine liberated is titrated with sodium thiosulfate solution. 7.1.2 Reagents During the analysis, use only reagents of recognized analytical grade and only water of at least grade 3 purity as defined in ISO 3696. WARNING Us
47、e the reagents in accordance with the appropriate health and safety regulations. 7.1.2.1 Hydrochloric acid, concentrated, approximately 37 % (m/m), 1,19 g/ml. 7.1.2.2 Hydrochloric acid, diluted 1 + 1. Add 1 part by volume of the concentrated hydrochloric acid (7.1.2.1) to 1 part by volume of water.
48、7.1.2.3 Mixture of sulfuric and orthophosphoric acids Mix 310 ml of concentrated sulfuric acid approximately 96 % (m/m), 1,84 g/ml) carefully with 250 ml of concentrated orthophosphoric acid (H 3 PO 4 ) approximately 85 % (m/m), 1,70 g/ml. Add the resultant mixture slowly to about 400 ml of water an
49、d then dilute with water to 1 litre. 7.1.2.4 Potassium hydroxide solution, 10 % (m/m). 7.1.2.5 Potassium iodide solution, 10 % (m/m). 7.1.2.6 Sodium acetate solution Dissolve 500 g of crystalline sodium acetate in 1 000 ml of water. 7.1.2.7 Mercury(II) chloride, saturated solution (60 g/l to 100 g/l).EN ISO 2495:2000 6 BSI 06-2001 7.1.2.8 Tin(II) chloride, 100 g/l solution. Dissolve 50 g of SnCl 2 2H 2 O in 300 ml of concentrated hydrochloric acid (7.1.2.1) and dilute with wa
