ANSI-IT4.186-1987.pdf
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1、c A N S I PH4*l8h 87 0724350 OOLl270 7 Revision of ANSI PH4.1861980 O American National Standard s a An American National Standard implies 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 con
2、sumer, and the general public. The existence of an American National Stan- dard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American Nation
3、al Standards are subject to periodic review and users are cautioned to obtain the latest editions. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or a
4、uthority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Instituterequire that action be ta
5、ken to reaffirm, revise, or withdraw this standard no later than five years from the date of ap- proval. Purchasers of American Nationai Standards may receive current information on aU standards by calling or writing the American Na- tional Standards Institute. : for photography (chemicals) - hydrox
6、ylamine sulfate Approved October 16, 1986 Secretariat: National Association of Photographic Manufacturers, Inc I I Warning and Safety Precautions Some of the chemicals specified in the test proce- dures in this standard are corrosive, toxic, or otherwise hazardous. Specific caution, warning, and dan
7、ger notices are given in the footnotes but, in addition, the normal precautions required dur- ing the performance of any chemical procedure must be exercised at ail times. It is recommended that anyone using these chemicals obtain from the manufacturers pertinent information about the hazards, handl
8、ing, and use of these chemicals. Such information is usually furnished by the chemical manufacturer in the form of a material safety data sheet. I Page 1 of 4 pages Introduction (This Introduction is not part of American National Standard PH4.186-1987.) This standard is one of a series that establis
9、hes criteria of purity for chemicals used in processing photographic materials. Although the ultimate criterion for suitability of a photographic-grade chemical is its successful perfor- mance in an appropriate use test, the shorter, more economical tests described herein are generally adequate. Thi
10、s standard is a revision of American National Standard Specification for Photographic Grade Hy- droxylamine Sulfate, (NH20H), H2 SO4 (hydroxyl- ammonium sulfate) (oxammonium sulfate), ANSI PH4.186-1980. In this latest revision, the section on “Physical Appearance” has been replaced with a sec- yllni
11、uulnmm-q American National Standards Institute, 1430 Broadway, New York. J,Y. 10018 ANSI 5C281/4 7 / Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 01:37:09 MDTNo reproduction or
12、 networking permitted without license from IHS -,-,- Page 2 of 4 pages tion on “General Information, The section on “Re- agents for Test Methods” has been renamed “Reagents, Materials, and Glassware.” Strength of standard solu- tions is now expressed as molarity. Also, minor changes in precaution no
13、tations have been made, and the gen- eral format has been changed to be in agreement with the style outlined in the Directives for the Technical Work of the International Organization for Standardi- zation (ISO). 1. Scope This standard establishes criteria for the purity of pho- tographic-grade hydr
14、oxylamine sulfate and describes the tests to be used to determine the purity. 2. General Information 2.1 Physical Properties. Hydroxylamine sulfate exists in the form of colorless or white crystals or powder, The chemical formula is (NH, OH), H, SO4 and the relative molar mass is 164.14. 2.2 Hazardo
15、us Properties. Hydroxylamine sulfate is irritating to eyes and skin and is harmful if swallowed. Aqueous solutions are very acidic. 2.3 Storage and Handling. Hydroxylamine sulfate should be stored in a cool dry place where contact with alkalines is unlikely. Under alkaline conditions (pH 7 or higher
16、), free hydroxylamine is liberated. The decom- position of hydroxylamine under alkaline conditions can be rapid and explosive. 3. Summary of Requirements Assay (“,OH), aHzSO4 97.0 (m/m) minimum Residue after ignition 0.05% (m/m) maximum Heavy metals (as Pb) 0.001% (m/m) maximum Iron (Fe) 0.001% (m/m
17、) maximum Ammonium (NH4) To pass test NOTE: m/m = Mass per mass (weight per weight) 4. Reagents, Materials, and Glassware 4.1 Reagents health and safety precautions, as shown on containers 4.1.1 Reagents shall be handled in conformity with or as given in other sources of such information. Proper lab
18、eling of prepared reagents includes name, date of preparation, expiration date, restandardization date, and adequate health and safety precautions, The dis- posal of reagents and all materials shall conform to applicable environmental regulations. . certified reagent grade chemicals and shall meet t
19、he specifications given in Reagent Chemicals published by the American Chemical Society (ACS) in 198 1, or chemicals of a purity acceptable for the analysis. The acids and ammonia solutions referred to in ail the in- structions shall be of full strength unless dilution is specified, Dilution is spec
20、ified in terms of molarity,M, when standardization is required, The number of signif- icant figures to which molarity is known shall be suffi- cient to ensure that the reagent does not limit the reli- ability of the test method. When dilution is indicated as (1 + X), it means that one volume of the
21、specified reagent is added to X volumes of distilled water. 4.1.2 Reagents used in the test procedures shall be 4.2 Water. Whenever water is specified in the fest pro- cedures, only distilled water or water of at least equal purity shall be used. 4.3 Glassware. All glassware subject to heating shall
22、 be of heat-resistant glass, for example, Pyrex or equivalent. 5. Test Procedures The test procedures described in Sections 6 through 10 shall be followed to determine whether the test sample meets the purity requirements listed in Section 3. Tests shall be made on samples in their “as received” con
23、dition. 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 in place of the tests described in this standard. 6. Assay 97.0% (m/m) minimum (NH, OH)z H z SO4 6.1 Rea
24、gent - Standard Potassium Permanganate Solu- tion, 0.02M (3.16 g/L). Analyzed reagent solution is recommended. This is commercially available from several vendors. i Sold under names such ns oxammonium sulfate, Iiydroxyl- ammonium dihydroxylamine sulfate. Available from American Chemical Society, 11
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