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1、BRITISH STANDARD BS 6857:1987 ISO 4620:1986 Specification for Cadmium pigments for paints Cadmium pigments Specification and methods of test UDC 667.622.11:661.848 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:35:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6857:1987 This British Sta
2、ndard, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 July 1987 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PVC
3、/1 Draft for comment 80/53927 DC ISBN 0 580 16016 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pigments, Paints and Varnishes Standards Committee (PVC/-) to Technical Committee PVC/1 upon which the following bodies were represented:
4、 Aluminium Powder and Paste Association British Colour Makers Association British Precast Concrete Federation Ltd. Cement Makers Federation Chemical Industries Association Oil and Colour Chemists Association Paintmakers Association of Great Britain Ltd. Red Lead and Litharge Manufacturers Associatio
5、n Titanium Pigment Manufacturers Technical Committee Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:35:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6857:1987 BSI 12-1999i Contents Page Committees responsibleInside front
6、 cover National forewordii 1Scope and field of application1 2References1 3Definition1 4Classification2 5Required characteristics and their tolerances2 6Sampling2 7Determination of total cadmium and zinc contents2 8Determination of selenium content4 9Determination of sulfur content5 10Calculation of
7、the total content of cadmium, zinc, selenium and sulfur6 11Preparation of the hydrochloric acid extract6 12Determination of “soluble” antimony content6 13Determination of “soluble” arsenic content6 14Determination of “soluble” barium content6 15Determination of “soluble” cadmium content6 16Determina
8、tion of “soluble” chromium content8 17Determination of “soluble” lead content8 18Determination of “soluble” mercury content8 19Determination of “soluble” selenium content8 20Determination of “soluble” zinc content8 21Test report10 Table 1 Essential requirements3 Table 2 Conditional requirements3 Tab
9、le 3 Standard matching solutions9 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:35:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6857:1987 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Pigm
10、ents, Paints and Varnishes Standards Committee. It is identical with ISO 4620:1986 “Cadmium pigments Specifications and methods of test”, published by the International Organization for Standardization (ISO). It has been assumed in the drafting of this standard that it will be used and applied by th
11、ose who are appropriately qualified and experienced. The substances and procedures described may be injurious to health if adequate precautions are not taken. This standard refers only to its technical suitability and does not absolve the user from statutory obligations relating to health and safety
12、. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following
13、. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. The symbol “l” has been used to denote litre (and in its submultiples). In British Standards it is current practice to use the symbol “L” and to use t
14、he spelling “sulphur”, etc., instead of “sulfur”, etc. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Cross-references International StandardsCorresponding British Standards BS 3483 Methods for testing pigments for paints IS
15、O 787-1:1982Part A1:1983 Comparison of colour (Identical) ISO 787-2:1981Part B6:1982 Determination of matter volatile at 105 C (Identical) ISO 787-5:1980Part B7:1974 Determination of oil absorption value (Identical) ISO 787-7:1981Part B3:1974 Determination of residue on sieve (water method, using a
16、manual procedure) (Identical) ISO 787-8:1979Part C2:1980 Determination of matter soluble in water (cold extraction method) (Identical) ISO 787-9:1981Part C4:1982 Determination of pH value of an aqueous suspension (Identical) ISO 787-16:1986Part A4:1974 Comparison of relative tinting strength (or equ
17、ivalent colouring value) and colour on reduction in linseed stand oil using the automatic muller (Technically equivalent) ISO 787-20:1975Part B5:1974 Comparison of ease of dispersion (oscillatory shaking method) (Technically equivalent) ISO 787-21:1979Part C8:1980 Comparison of heat stability (Ident
18、ical) ISO 842:1984BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:35:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6857:1987 BSI 12-1999iii The Technical Committee has reviewed the provisions of the fol
19、lowing International Standards, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this British Standard. Related British Standards are given in parentheses. Pending publication of ISO 3856-8 and ISO 3856-9 any suitable methods for the determ
20、ination of soluble selenium and soluble arsenic should be used in combination with BS 3900-B5. It is intended to implement ISO 3856-8 and ISO 3856-9 as British Standards when they are published. Additional information. In order to carry out some of the tests described in this standard it is necessar
21、y for a reference sample to be supplied or agreed by the parties concerned (see clause 5 and Table 2). NOTEIn clause 2, in the titles of ISO 3856-2 and ISO 3856-6, “spetrophotometric” and “spetrometric” should read “spectrophotometric” and “spectrometric” respectively. In the note at the beginning o
22、f clause 7, line 5, “interesed” should read “interested”. International StandardsCorresponding British Standards ISO 1042:1983BS 1792:1982 Specification for one-mark volumetric flasks (Identical) BS 3900 Methods of test for paints ISO 3856-1:1984Part B6:1986 Determination of “soluble” lead content (
23、Identical) ISO 3856-2:1984Part B7:1986 Determination of “soluble” antimony content (Identical) ISO 3856-3:1984Part B8:1986 Determination of “soluble” barium content (Identical) ISO 3856-4:1984Part B9:1986 Determination of “soluble” cadmium content (Identical) ISO 3856-6:1984Part B11:1986 Determinati
24、on of total chromium content of liquid matter (Identical) ISO 3856-7:1984Part B12:1986 Determination of “soluble” mercury content (Identical) ISO 4793:1980BS 1752:1983 Specification for laboratory sintered or fritted filters including porosity grading (Identical) BS 3900 Methods of test for paints I
25、SO 6713:1984Part B5:1986 Preparation of acid extracts from liquid paints or coating powders (Identical) ISO 385-1:1984(BS 846:1985. Specification for burettes) ISO 648:1977(BS 1583:1986. Specification for one-mark pipettes) ISO 3696a(BS 3978:1966. Specification for water for laboratory use) ISO 3856
26、-8a(No British Standard) ISO 3856-9aBS 4404:1968. Method for the determination of arsenic (silver diethyldithiocarbamate procedure) a In preparation. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:35:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6857:1987 iv BSI 12-1999 A British Stand
27、ard 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,
28、an inside front cover, pages i to iv, pages 1 to 10, 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. Licensed Copy: sheffieldun sheffieldun, n
29、a, Wed Dec 06 15:35:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6857:1987 BSI 12-19991 1 Scope and field of application This International Standard specifies the requirements and the corresponding methods of test for cadmium pigments suitable for general use. 2 References ISO 385-1, Laboratory
30、glassware Burettes Part 1: General requirements. ISO 648, Laboratory glassware One-mark pipettes. ISO 787, General methods of test for pigments and extenders Part 1: Comparison of colour of pigments; Part 2: Determination of matter volatile at 105 C; Part 5: Determination of oil absorption value; Pa
31、rt 7: Determination of residue on sieve Water method Manual procedure; Part 8: Determination of matter soluble in water Cold extraction method; Part 9: Determination of pH value of an aqueous suspension; Part 16: Determination of relative tinting strength (or equivalent colouring value) and colour o
32、n reduction of coloured pigments Visual comparison method; Part 20: Comparison of ease of dispersion (oscillatory shaking method); Part 21: Comparison of heat stability of pigments using a stoving medium. ISO 842, Raw materials for paints and varnishes Sampling. ISO 1042, Laboratory glassware One-ma
33、rk volumetric flasks. ISO 3696, Water for laboratory use Specifications.1) ISO 3856, Paints and varnishes Determination of “soluble” metal content Part 1: Determination of lead content Flame atomic absorption spectrometric method and dithizone spectrophotometric method; Part 2: Determination of anti
34、mony content Flame atomic absorption spectrometric method and Rhodamine B spectrophotometric method; Part 3: Determination of barium content Flame atomic emission spectrometric method; Part 4: Determination of cadmium content Flame atomic absorption spectrometric method and polarographic method; Par
35、t 6: Determination of total chromium content of the liquid portion of the paint Flame atomic absorption spectrometric method; Part 7: Determination of mercury content of the pigment portion of the paint and of the liquid portion of water-dilutable paints Flameless atomic absorption spectrometric met
36、hod; Part 8: Determination of selenium content Flame atomic absorption spectrometric method and X-ray fluorescence method;2) Part 9: Determination of arsenic content Atomic absorption and silver diethyldithiocarbamate spectrometric methods.1) ISO 4793, Laboratory sintered (fritted) filters Porosity
37、grading, classification and designation. ISO 6713, Paints and varnishes Preparation of acid extracts from paints in liquid or powder form. 3 Definition cadmium pigment an inorganic coloured pigment consisting predominantly of cadmium sulfide or of mixed crystals of cadmium sulfide and cadmium seleni
38、de, in which the cadmium may be partially replaced by zinc NOTE 1To adjust the relative tinting strength and/or to obtain certain application properties, cadmium pigments may contain colourless additives. NOTE 2Cadmium pigments are characterized by a very low solubility in water and diluted acids an
39、d by a very high heat stability. NOTE 3Yellow cadmium pigments consist mainly of mixed crystals of cadmium sulfide and zinc sulfide (Pigment yellow No. 37, part 2, ref. 77 199)3) or of cadmium sulfide (Pigment orange No. 20, part 2, ref. 77 199).3) Orange to maroon cadmium pigments consist mainly of
40、 mixed crystals of cadmium sulfide and cadmium selenide (Pigment red No. 108, part 2, ref 77 2023). 1) At present at the stage of draft. 2) In preparation. 3) Classification according to the Colour Index. The Colour Index is published by the Society of Dyers and Colourists, Bradford, England and the
41、 American Association of Textile Chemists and Colorists, Lowell, Mass. (USA), revised edition 1971. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 15:35:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6857:1987 2 BSI 12-1999 4 Classification This International Standard specifies the followi
42、ng three types of pigment, which shall be free from organic materials, other coloured inorganic pigments and brightening agents: Type 1: Cadmium pigments, concentrated. These pigments contain not more than 30 % (m/m) of extenders to adjust their relative tinting strength. Type 2: Cadmium pigments, e
43、xtended. These pigments contain not more than 70 % (m/m) of extenders to facilitate processing. Type 3: Cadmium pigments, unextended. These are essentially pure and do not contain any extenders. NOTEType 1 and type 2 pigments are generally suitable for use in paints, plastics, rubber, etc. Type 3 pi
44、gments are mainly suitable for use in ceramics. 5 Required characteristics and their tolerances 5.1 For cadmium pigments complying with this International Standard, the essential requirements are specified in Table 1 and the conditional requirements are referred to in Table 2. For the conditional re
45、quirements to be specified, prior agreement between the interested parties is necessary. 5.2 The agreed reference pigment, which is referred to in Table 2, shall conform with the requirements specified in Table 1. 6 Sampling Take a representative sample of the product to be tested as described in IS
46、O 842. 7 Determination of total cadmium and zinc contents NOTEThe method given in this clause allows the separate determination of the alkali earth metals present. However, it should be used only for cadmium pigments with a zinc content greater than 5 %. For pigments with lower zinc contents, a suit
47、able atomic absorption spectrometric method should be agreed between the interesed parties. 7.1 Principle Dissolution of a test portion in hydrochloric acid and nitric acid. After neutralization, addition of potassium cyanide and titration of the alkali earth metals with EDTA solution. Addition of f
48、ormaldehyde solution to destroy the cadmium and zinc cyanide complexes. Titration of the sum of cadmium and zinc ions with EDTA solution. Destruction of the cadmium-EDTA complex in the titrated solution with sodium diethyldithiocarbamate and precipitation of the cadmium with ammonia solution. Back-t
49、itration of the excess of EDTA corresponding to the cadmium, with magnesium sulfate solution. 7.2 Reagents During the analysis, use only reagents of recognized analytical grade and only water of at least grade 3 purity according to ISO 3696. WARNING Use the reagents in accordance with the appropriate health and safety regulations. 7.2.1 Hydrochloric acid, approximately 37 % (m/m), approximately 1,18 g/ml. 7.2.2 Hydrochloric acid, diluted, c(HCl) approximately 0,1 mol/l. 7.2