1、 ANSI/I3A IT4.304-2002for Photography Processing Chemicals Specifications for Sodium Ferrocyanide DecahydrateANSI/I3AIT4.304-2002ANSI/I3A IT4.304-2002Revision and redesignation ofANSI/NAPM IT4.304-1987 (R1996)American National Standardfor Photography Processing Chemicals Specifications for Sodium Fe
2、rrocyanide DecahydrateSecretariatInternational Imaging Industry Association, Inc. (I3A)Approved June 10, 2002 American National Standards Institute, Inc.Approval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approval
3、havebeen met by the standards developer.Consensus is established when, in the judgement of the ANSI Board ofStandards Review, substantial agreement has been reached by directly andmaterially affected interests. Substantial agreement means much more thana simple majority, but not necessarily unanimit
4、y. Consensus requires that allviews and objections be considered, and that a concerted effort be madetowards their resolution.The use of American National Standards is completely voluntary; theirexistence does not in any respect preclude anyone, whether he has approvedthe standards or not, from manu
5、facturing, marketing, purchasing, or usingproducts, processes, or procedures not conforming to the standards.The American National Standards Institute does not develop standards andwill in no circumstances give an interpretation of any American NationalStandard. Moreover, no person shall have the ri
6、ght or authority to issue aninterpretation of an American National Standard in the name of the AmericanNational Standards Institute. Requests for interpretations should beaddressed to the secretariat or sponsor whose name appears on the titlepage of this standard.CAUTION NOTICE: This American Nation
7、al Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, orwithdraw this standard. Purchasers of American National Standards mayreceive current information on all standards by calling
8、 or writing the AmericanNational Standards Institute.American National StandardPublished byAmerican National Standards Institute, Inc.25 West 43rd Street, New York, NY 10036Copyright 2002 by American National Standards Institute, Inc.All rights reserved.No part of this publication may be reproduced
9、in anyform, in an electronic retrieval system or otherwise,without prior written permission of the publisher.Printed in the United States of AmericaiContentsPageForeword ii0 Introduction. iii1 Scope . 12 Normative references . 13 General. 14 Requirements . 25 Reagents and glassware 26 Sampling. 27 T
10、est methods 2Table1 Summary of requirements 2iiForeword (This foreword is not part of American National Standard ANSI/I3A IT4.304-2002.)This standard is one of a series of standards establishing criteria of purity for chemi-cals used in processing photographic materials. In the current review proces
11、s, thisseries of standards is being updated and revised in format. Many of the standards inthis series, but not all, also exist as standards of the International Organization forStandardization (ISO). The current updates and revisions are in accord with thatdone for the ISO standards. In an effort t
12、o promote the concept of international stan-dardization, references to ISO standards have been left in place. Suggestions for the improvement of this standard will be welcome. They should besent to the International Imaging Industry Association, Inc. (I3A), 550 MamaroneckAvenue, Suite 307, Harrison,
13、 NY 10528-1615, e-mail: i3astdsi3a.org. This standard was processed and approved for submittal to ANSI by I3A TechnicalCommittee IT4 on Photographic Processing. Committee approval of the standarddoes not necessarily imply that all committee members voted for its approval. At thetime it approved this
14、 edition of the standard, the IT4 Committee had the followingmembers:Joseph M. Rao, ChairmanJohn Gignac, SecretaryOrganization Represented Name of RepresentativeInternational Imaging Industry Association, Inc. (I3A) Jan CarlockLinda CrosbyKunihiro FujiwaraRonald A. KleinLaszlo PapaiAnthony Jarkowsky
15、 General Chemical Corporation. Mark DulikPhotographic Society of America, Inc. . Grant HaistPhoto Marketing Association International Herb SteinIndividual ExpertsPeter KrauseNorman NewmanJoseph M. RaoSubcommittee IT4-1 on Specifications for Photographic Chemicals, which was re-sponsible for this edi
16、tion, had the following members:Joseph M. Rao, Chairman-protem Jan CarlockLinda CrosbyMark DulikKunihiro FujiwaraNorman NewmanLaszlo PapaiHerb Steiniii0 Introduction0.1 This standard is one of a series that establishes criteria of purity for chemicalsused in processing photographic materials. Genera
17、l test methods and procedurescited in this standard are compiled in Parts 1 and 8 of ISO 10349.This standard is intended for use by individuals with a working knowledge of analyti-cal techniques, which may not always be the case. Some of the procedures utilizecaustic, toxic, or otherwise hazardous c
18、hemicals. Safe laboratory practice for thehandling of chemicals requires the use of safety glasses or goggles and other protec-tive apparel such as rubber gloves, face masks or aprons where appropriate. Normal precautions required in the performance of any chemical procedure shall beexercised at all
19、 times, but care has been taken in this standard to provide warningsfor hazardous materials. Hazard warnings designated by a letter enclosed in anglebrackets, , are used as a reminder in those steps detailing handling operationsand are defined in ISO 10349-1. More detailed information regarding haza
20、rds, han-dling, and use of these chemicals may be available from the manufacturer.0.2 This standard provides chemical and physical requirements for the suitability of aphotographic-grade chemical. The tests correlate with undesirable photographic ef-fects. Purity requirements are set as low as possi
21、ble consistent with these photo-graphic effects. These criteria are considered the minimum requirements necessaryto assure sufficient purity for use in photographic processing solutions, except that ifthe purity of a commonly available grade of chemical exceeds photographic process-ing requirements
22、and if there is no economic penalty in its use, the purity require-ments have been set to take advantage of the availability of the higher qualitymaterial. Every effort has been made to keep the number of requirements to a minimum. Inertimpurities are limited to amounts which will not unduly reduce
23、the assay. All tests areperformed on samples “as received“ to reflect the condition of materials furnished foruse. Although the ultimate criterion for suitability of such a chemical is its successfulperformance in an appropriate use test, the shorter, more economical test methodsdescribed in this st
24、andard are generally adequate.Assay procedures have been included in all cases where a satisfactory method isavailable. An effective assay requirement serves not only as a safeguard of chemicalpurity, but also as a valuable complement to the identity test. Identity tests have beenincluded whenever a
25、 possibility exists that another chemical or mixture of chemicalscould pass the other tests. All requirements listed in clause 4 are mandatory. The physical appearance of thematerial and any footnotes are for general information only and are not part of the re-quirements.0.3 Efforts have been made t
26、o employ tests that are capable of being run in any nor-mally equipped laboratory and, wherever possible, to avoid tests that require highlyspecialized equipment or techniques. Instrumental methods have been specifiedonly as alternative methods or alone in those cases where no other satisfactorymeth
27、od is available. Over the past few years, great improvements have been made in instrumentation forvarious analyses. Where such techniques have equivalent or greater precision, theymay be used in place of the tests described in this standard. Correlation of such alter-native procedures with the given
28、 method is the responsibility of the user. In case ofdisagreement in results, the method called for in the specification shall prevail.Where a requirement states “to pass test“, however, alternative methods shall not beused. AMERICAN NATIONAL STANDARD ANSI/I3A IT4.304-20021 American National Standar
29、d for Photography Processing Chemicals Specifications for Sodium Ferrocyanide Decahydrate 1 Scope This standard establishes criteria for the purity of photographic-grade sodium ferrocyanide decahydrate and specifies the tests to be used to determine the purity. 2 Normative references The following s
30、tandards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibil
31、ity of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid standards. ISO 10349-1:1992, Photography Photographic-grade chemicals Test methods Part 1: General. ISO 10349-8:1992, Photography Photographic-grade chemicals Test
32、methods Part 8: Determination of volatile matter. 3 General 3.1 Physical properties Sodium ferrocyanide decahydrate, Na4Fe(CN)6G194G3G20G19G3G432O, exists in the form of pale-yellow to yellow crystals. It has a relative molecular mass of 484.07. 3.2 Hazardous properties Caution must be exercised in
33、handling sodium ferrocyanide. To avoid the generation of very toxic hydrogen cyanide: DO NOT MIX this chemical with hot or concentrated acids; DO NOT EXPOSE solutions containing this chemical to sunlight. 3.3 Storage Sodium ferrocyanide decahydrate loses part of its water of crystallization when it
34、is stored in paper bags or exposed to ordinary laboratory conditions. There is no substantial loss in weight when this chemical is stored in moisture-proof bags or in plastic liners. ANSI/I3A IT4.304-20022 4 Requirements A summary of the requirements is shown in Table 1. Table 1 Summary of requireme
35、nts Test Limit Subclause Standard in which test method is given Assay Minimum: 98.0% Maximum: 102.0% 7.1 ANSI/I3A IT4.304 Mass fraction of volatile matter Minimum: 35.2% Maximum: 39.2% 7.2 ISO 10349-8 Mass fraction of insoluble matter Maximum: 0.03% 7.3 ANSI/I3A IT4.304 5 Reagents and glassware All
36、reagents, materials, and glassware shall conform with the requirements specified in ISO 10349-1 unless otherwise noted. The hazard warning symbols, used as a reminder in those steps detailing handling operations, are defined in ISO 10349-1. These symbols are used to provide information to the user a
37、nd are not meant to provide conformance with hazardous labeling requirements, as these vary from country to country. 6 Sampling See ISO 10349-1. 7 Test methods 7.1 Assay 7.1.1 Specification The minimum mass fraction content of sodium ferrocyanide decahydrate shall be 98.0%; the maximum mass fraction
38、 shall be 102.0%. 7.1.2 Reagents 7.1.2.1 Sulfuric acid, H2SO4, 1.84 g/ml (DANGER: ).1)7.1.2.2 Potassium permanganate, KMnO4, standard volumetric solution of 0.02 mol/l (3.16 g/l). 7.1.3 Apparatus 7.1.3.1 Burette, of 50 ml capacity. 7.1.4 Procedure Use a test portion of the sample of about 2 g weighe
39、d to the nearest 0.0001 g. Transfer the test portion to a 600 ml beaker, add 400 ml of water, and dissolve. Add 10 ml of sulfuric acid (7.1.2.1) () and titrate with standard potassium permanganate solution (7.1.2.2) until the first trace of brown color is visible. _ 1)Hazard warning codes are define
40、d in ISO 10349-1, clause 4. ANSI/I3A IT4.304-20023 7.1.5 Expression of results The assay, expressed as a percentage by the mass of Na4Fe(CN)6 10H2O, is given by where V is the volume, in milliliters, of the potassium permanganate (7.1.2.2) used to reach the titration endpoint; m is the mass, in gram
41、s, of the test portion; 4.841 is a conversion factor for the mass of Na4Fe(CN)6 10H2O equivalent to 1 mole of potassium permanganate (i.e., 48.41) x the conversion factor for milliliters to liters (i.e., 0.001) x the conversion factor to percentage (i.e., 100). 7.2 Mass fraction of volatile matter 7
42、.2.1 Specification The minimum mass fraction content of volatile matter shall be 35.2%; the maximum mass fraction shall be 39.2%. 7.2.2 Procedure Determine the percentage of volatile matter in accordance with ISO 10349-8. Use a test portion of about 10.0 g, weighed to the nearest 0.001 g, and heat i
43、n an oven at 150oC + 5oC for 4 h. 7.3 Mass fraction of insoluble matter 7.3.1 Specification The maximum mass fraction of insoluble matter shall be 0.03%. 7.3.2 Procedure Dissolve a 20 g + 0.1 g test portion of the sample in 300 ml of water. Using a tared sintered-bottom glass crucible of medium porosity, filter the resulting solution. Wash the residue thoroughly with water, dry the residue at 150oC for 4 h, cool it in a desiccator, and weigh. The weight of the residue shall not be more than 0.006 g. mV841.4
