ANSI-IT4.234-1986.pdf
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1、A N S I PHLI.234 86 07241150 CIOLL354 2 M 19 ANSI PH4.234-1986 Revision of ANSI PH4.234-1980 American National Standard for photography (chemicals) - trisodium phosphate, dodecahydrate Approved October 16, 1986 Secretariat: National Association of Photographic Manufacturers, I nc Warning and Safety
2、Precautions Some of the chemicals specified in the test proce- dures in this standard are corrosive, toxic, or otherwise hazardous. Specific caution, warning, and danger notices are given in the footnotes but, in addition, the normal precautions required dur- ing the performance of any chemical proc
3、edure must be exercised at all times. It is recommended that anyone using these chemicals obtain from the manufacturers pertinent information about the hazards, handling, and use of these chemicals. Such information is usually furnished by the chemicalmanufacturer in the form of a material safety da
4、ta sheet. I Page 1 of 4 pages Introduction (This Introduction is not part of American National Standard PH4.234-19 86 .) This standard is one of a series that establishes criteria of purity for chemicals used in processing photographic materials. Although the ultimate criterion for suitability of a
5、photographic-g;ade chemical is its successful perfor- mance in an appropriate test, the shorter, more eco- nomical tests described herein are generally adequate. This standard is a revision of American National Standard Specification for Photographic Grade Triso- dium Phosphate, Dodecahydrate, (Na3P
6、04 12H20), NaOH), ANSI PH4.234-1980. In this latest revision, the section on “Physical Appearance” has been re- placed with a section on “General Information.” The section on “Reagents for Test Methods” has been re- named “Reagents, Materials, and Glassware.” Strength of standard solutions is now ex
7、pressed as molarity. Also, minor changes in precaution notations have been made, and the general format has been changed to be in agreement with the style outlined in the Directives for the Technical Work of the International Organiza- tion for Standardization (ISO). An American National Standard im
8、plies a consensus of those substantially concerned with its scope and provisions, An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Stan- dard does not in any respect preclude anyone, whether he h
9、as approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review and users are cautioned to obtain the latest editions. The American National Standards In
10、stitute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shaii have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. CAUTIO
11、N NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of ap- proval, Purchasers of American Nati
12、onal Standards may receive current information on all standards by calling or writing the American Na- tional Standards Institute. 0 1987 by American National Stand- 1430 Eroadwav. New York, N.Y, I0018 ANSISC187/4 *I Copyright American National Standards Institute Provided by IHS under license with
13、ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 01:40:51 MDTNo reproduction or networking permitted without license from IHS -,-,- A N S I PH4.234 Bb B Il724350 0033355 4 Page 2 of 4 pages i. Scope This standard establishes criteria for purity of photo- graphic-
14、grade trisodium phosphate, dodecahydrate and describes the tests to be used to determine the purity. 2. General Information 2.1 Physical Properties. Trisodium phosphate, dodeca- hydrate exists in the form of colorless or white crystals. The chemical formula is Na3P04 12H20 and the rela- tive molar m
15、ass is 380.12. 2.2 Hazardous Properties. Trisodium phosphate, do- decahydrate, is a strong base. It is corrosive. Contact with skin and eyes should be avoided. The dust should not be inhaled. 2.3 Handling and Storage Conditions. No special pre- cautions are required for handling and storage of tri-
16、sodium phosphate, dodecahydrate, beyond those that are applicable to any chemical material. 3. Summary of Requirements Assay (as Na,P04 12H20) 98.0% (m/m) minimum* Excess alkali (as NaOH) 2.5% (m/m) maximum Insoluble matter 0.02% (m/m) maximum Halides (as CI) 0.05% (m/m) maximum Heavy metals (as Pb)
17、 0.001% (m/m) maximum Iron (Fe) 0.001% (m/m) maximum Appearance of solution To pass test *This salt, when stored under ordinary conditions, may lose some water of crystallization. Any loss in water wi result in an assay of more than 100% Na,P04*12H,O but does not affect the determination of the rela
18、tive amount of free alkali present. NOTE: m/m = mass per mass (weight per weight) 4, Reagents, Materials, and Glassware 4.1 Reagents 4.1.1 Reagents shall be handled in conformity with health and safety precautions, as shown on containers or as given in other sources of such information. Proper label
19、ing of prepared reagents includes name, date of preparation, expiration date, restandardization date, and adequate health and safety precautions. The dis- Sold under names such as sodium phosphate, tribasic, dodeca- hydrate; trisodium orthophosphate, dodecahydrate; TSP. posa1 of reagents and all mat
20、erials shall conform to ap- plicable environmental regulations. 4.1.2 Reagents used in the test procedures shall be certified reagent-grade chemicals and shall meet the specifications given in Reagent Chemicals2 published by the American Chemical Society (ACS) in 1981, or chemicals of a purity accep
21、table for the analysis. The acids and ammonia solutions referred to in all the instructions shall be of full strength unless dilution is specified. Dilution is specified in terms of molarity, M, when standardization is required. The number of sig- nificant figures to which molarity is known shall be
22、 sufficient to ensure that the reagent does not limit the reliability of the test method. When dilution is indi- cated as (1 t X), it means that one volume of the speci- fied reagent is added to X volumes of distilled water. 4.2 Water. Whenever water is specified in the test pro- cedures, only disti
23、lled water or water of at least equal purity shall be used. 4.3 Glassware, All glassware subject to heating shall be of heat-resistant glass; for example, Pyrex or equiva- lent. 5. Test Procedures The test procedures described in Sections 6 through 12 shall be followed to determine whether the test
24、samples meet the purity requirements listed in Section 3. Tests shall be made in their “as received” condition. In the last several years, there have been great im- provements in instrumentation for various analyses. Where such techniques have the equivalent accuracy and precision, they may be used
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