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1、BRITISH STANDARD BS ISO 3625:1994 Implementation of ISO 3625:1994 Photography Processing chemicals Specifications for potassium hydroxide ICS 37.040.30 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 3625:1994 This British Standard, h
2、aving been prepared under the direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference CPW/42 Draft
3、 for comment 91/48770 DC ISBN 0 580 24852 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee CPW/42, Photography International coordination, upon which the following bodies were represented: British Film Institute British
4、Institute of Professional Photography British Photographic Association Sira Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Institute of Non-destructive Testing Chemical Industries Association Department of the Environment
5、 (Water Directorate) Royal Photographic Society Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 3625:1994 BSI 01-2000i Contents Page Committees responsibleInside front cover Nat
6、ional forewordii Forewordiii Text of ISO 36251 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 3625:1994 ii BSI 01-2000 National foreword This British Standard reproduces verbatim ISO 3625:1994 and implements it as the UK national sta
7、ndard. It supersedes BS 3753:1978, which is withdrawn. This British Standard is published under the direction of the Consumer Products and Services Sector Board whose Technical Committee CPW/42 has the responsibility to: aid enquirers to understand the text; present to the responsible international
8、committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BS
9、I, 389 Chiswick High Road, London W4 4AL. 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.
10、 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 4 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 tab
11、le on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3625:1994(E) ii BSI 01-2000 Contents Page Forewordii
12、i Introduction1 1Scope1 2Normative references1 3General2 3.1Physical properties2 3.2Hazardous properties2 3.3Handling and storage2 4Requirements2 5Reagents and glassware2 6Sampling2 7Test methods2 7.1Assay2 7.1.1Specification2 7.1.2Reagents2 7.1.3Apparatus3 7.1.4Procedure3 7.1.5Expression of results
13、3 7.2Heavy metals content3 7.2.1Specification3 7.2.2Procedure3 7.3Iron content3 7.3.1Specification3 7.3.2Procedure3 7.4Halides3 7.4.1Specification3 7.4.2Procedure3 7.5Carbonate3 7.5.1Specification3 7.5.2Reagents3 7.5.3Apparatus3 7.5.4Procedure3 7.5.5Expression of results4 7.6Appearance of solution4
14、7.6.1Specification4 7.6.2Procedure4 Table 1 Summary of requirements2 Descriptors: Photography, photographic materials, photographic chemicals, potassium hydroxide, specifications, materials specifications, purity criteria, tests, chemical analysis. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov
15、 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3625:1994(E) BSI 01-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out
16、through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO coll
17、aborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval b
18、y at least 75 % of the member bodies casting a vote. International Standard ISO 3625 was prepared by Technical Committee ISO/TC 42, Photography. This second edition cancels and replaces the first edition (ISO 3625:1976), which has been technically revised. Licensed Copy: sheffieldun sheffieldun, na,
19、 Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3625:1994(E) BSI 01-20001 Introduction 0.1 This International Standard is one of a series that establishes criteria
20、of purity for chemicals used in processing photographic materials. General test methods and procedures cited in this International Standard are compiled in parts 1, 5, 6 and 7 of ISO 10349. This International Standard is intended for use by individuals with a working knowledge of analytical techniqu
21、es, which may not always be the case. Some of the procedures utilize caustic, toxic or otherwise hazardous chemicals. Safe laboratory practice for the handling of chemicals requires the use of safety glasses or goggles, rubber gloves and other protective apparel such as face masks or aprons where ap
22、propriate. Normal precautions required in the performance of any chemical procedure are to be exercised at all times but care has been taken to provide warnings for hazardous materials. Hazard warnings designated by a letter enclosed in angle brackets, , are used as a reminder in those steps detaili
23、ng handling operations and are defined in ISO 10349-1. More detailed information regarding hazards, handling and use of these chemicals may be available from the manufacturer. 0.2 This International Standard provides chemical and physical requirements for the suitability of a photographic-grade chem
24、ical. The tests correlate with undesirable photographic effects. Purity requirements are set as low as possible consistent with these photographic effects. These criteria are considered the minimum requirements necessary to assure sufficient purity for use in photographic processing solutions, excep
25、t that if the purity of a commonly available grade of chemical exceeds photographic processing requirements and if there is no economic penalty in its use, the purity requirements have been set to take advantage of the availability of the higher-quality material. Every effort has been made to keep t
26、he number of requirements to a minimum. Inert impurities are limited to amounts which will not unduly reduce the assay. All tests are performed on samples “as received” to reflect the condition of materials furnished for use. Although the ultimate criterion for suitability of such a chemical is its
27、successful performance in an appropriate use test, the shorter, more economical test methods describes in this International Standard are generally adequate. Assay procedures have been included in all cases where a satisfactory method is available. An effective assay requirement serves not only as a
28、 safeguard of chemical purity but also as a valuable complement to the identity test. Identity tests have been included whenever a possibility exists that another chemical or mixture of chemicals could pass the other tests. All requirements listed in clause 4 are mandatory. The physical appearance o
29、f the material and any footnotes are for general information only and are not part of the requirements. 0.3 Efforts have been made to employ tests which are capable of being run in any normally equipped laboratory and, wherever possible, to avoid tests which require highly specialized equipment or t
30、echniques. Instrumental methods have been specified only as alternative methods or alone in those cases where no other satisfactory method is available. Over the past few years, great improvements have been made in instrumentation for various analyses. Where such techniques have equivalent or greate
31、r precision, they may be used in place of the tests described in this International Standard. Correlation of such alternative procedures with the given method is the responsibility of the user. In case of disagreement in results, the method called for in the specification shall prevail. Where a requ
32、irement states “to pass test”, however, alternative methods shall not be used. 1 Scope This International Standard establishes criteria for the purity of photographic-grade potassium hydroxide (DANGER: )1) and describes the tests to be used to determine the purity. 2 Normative references The followi
33、ng standards contain provisions which, through reference 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 encour
34、aged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 10349-1:1992, Photography Photographic-grade chemicals Test methods Part 1: General. 1) Hazard warning
35、codes are defined in ISO 10349-1:1992, clause 4. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3625:1994(E) 2 BSI 01-2000 ISO 10349-5:1992, Photography Photographic-grade chemicals Test methods Part 5: Determination of heavy metals and
36、 iron content. ISO 10349-6:1992, Photography Photographic-grade chemicals Test methods Part 6: Determination of halide content. ISO 10349-7:1992, Photography Photographic-grade chemicals Test methods Part 7: Determination of alkalinity or acidity. 3 General 3.1 Physical properties Potassium hydroxid
37、e, KOH, comes in the form of white sticks, pellets, flakes, granules or powder. It has a relative molecular mass of 56,11. 3.2 Hazardous properties Potassium hydroxide is corrosive (DANGER: ). Avoid contact with eyes, skin, and clothing. Avoid breathing dust. Refer to the Manufacturers Material Safe
38、ty Data Sheet (MSDS) for additional information. 3.3 Handling and storage Potassium hydroxide should be stored in a properly labelled and tightly sealed plastic container. Potassium hydroxide readily absorbs moisture with the liberation of heat. Potassium hydroxide reacts violently with acids. 4 Req
39、uirements A summary of the requirements is shown in Table 1. 5 Reagents and glassware All reagents, materials and glassware shall conform to the requirements specified in ISO 10349-1 unless otherwise noted. The hazard warning symbols used as a reminder in those steps detailing handling operations ar
40、e defined in ISO 10349-1. These symbols are used to provide information to the user and are not meant to provide conformance with hazardous labelling requirements as these vary from country to country. 6 Sampling See ISO 10349-1. 7 Test methods 7.1 Assay 7.1.1 Specification Content of KOH shall be 8
41、5,0 % (m/m) min. 7.1.2 Reagents 7.1.2.1 Hydrochloric acid, HCl, standard volumetric solution of 1,0 mol/l (36,46 g/l)2) 3). 7.1.2.2 Phenolphthalein indicator Dissolve 0,1 g of phenolphthalein in 50 ml of methanol or ethanol, then dilute to 100 ml with water. 7.1.2.3 Barium chloride solution, 100 g/l
42、. Dissolve 117 g of barium chloride dihydrate, BaCl22H2O, in 500 ml of water, then dilute to 1 litre with water. Neutralize with 0,1 mol/l hydrochloric acid or 0,1 mol/l sodium hydroxide using phenolphthalein indicator (7.1.2.2). 7.1.2.4 Carbon-dioxide-free water Repeat the preparation of carbon-dio
43、xide-free water as specified in ISO 10349-7. Table 1 Summary of requirements 2) Commercially available analysed reagent is recommended. If solutions are to be prepared, see any quantitative analytical chemistry text. 3) The solution can be prepared from hydrochloric acid, = 1,18 g/ml (approximately)
44、 (DANGER: ). TestLimitSubclause International Standard in which test method is given Assay (as KOH) Heavy metals (as Pb) Iron (Fe) Halides (as Cl) Carbonate (as CO) Appearance of solution 85,0 % (m/m) min. 0,003 % (m/m) max. 0,000 5 % (m/m) max. 0,3 % (m/m) max. 1,3 % (m/m) max. Clear and free from
45、insoluble matter except for a slight flocculence 7.1 7.2 7.3 7.4 7.5 7.6 ISO 3625 ISO 10349-5 ISO 10349-5 ISO 10349-6 ISO 3625 ISO 3625 NOTEm/m = mass/mass 2 3 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:43:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 3625:1994(E) BSI 01-20003 7.1
46、.3 Apparatus Usual laboratory apparatus and, in particular, the following. 7.1.3.1 One-mark volumetric flask, of 500 ml capacity. 7.1.3.2 Burette, of 50 ml capacity. 7.1.3.3 Pipette, of 50 ml capacity. 7.1.4 Procedure Weigh, to the nearest 0,01 g, a test portion of 19 g to 21 g and transfer to a bea
47、ker containing 250 ml of carbon-dioxide-free water (7.1.2.4). After the solid has dissolved and the solution cooled to room temperature, transfer the solution to a 500 ml volumetric flask and rinse several times with carbon-dioxide-free water (7.1.2.4). Dilute to volume with carbon-dioxide-free wate
48、r. Pipette a 50 ml aliquot of the sample solution into a 500 ml glass stoppered conical flask and dilute with 200 ml of carbon-dioxide-free water. Add 5 ml of barium chloride solution (7.1.2.3). Stopper the flask and shake. Allow the mixture to stand for 5 min. Add 3 drops of phenolphthalein indicat
49、or (7.1.2.2) and titrate with hydrochloric acid (7.1.2.1) to the first disappearance of the pink colour. Retain this solution for use in the carbonate test (7.5). 7.1.5 Expression of results The assay, expressed as a percentage by mass of KOH, is given by 56,11cV/m 7.2 Heavy metals content 7.2.1 Specification Maximum content of heavy metals shall be 0,003 % (m/m). 7.2.2 Procedure NOTE 1The standard for the iron test (7.3) is prepared in the same way as the heavy metals standard. Determine the percentage of heavy metals in accordan