ANSI IT4.303-1984 Photography (Chemicals) - Potassium Persulfate《摄影(化学品).过硫酸钾》.pdf
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1、t ANSI/I3AIdd) Rewsion of sNSI PH4.303-1977 ! American National Standard for photography (chemicals) - potassium persulfate Approved June 12, 1984 Secretariat: Natlonal Association of Photographic Manufacturers, Inc Warning and Safety Precautions Some of the chemicals specified in the test proze- du
2、res m this standard are caustic. to-.uz. or other- wise hazardous. Speclfrc caution, warning, and danger notrces are given m the footnotes but. in addltlon. the normal precautions requned durmg the performance of any chemical procedure shall be excrclsed at all tmies It 1s recommended that anyone us
3、mg these chemicals obtains from the manufacturers pertinent mformdtlon about the halards. handlmg. and use of these chemrcals. Such Information IS usually furmshed by the chemical manufacturer in the form of a manufac- turers material safety data sheet (OSHA Form 20 or equivalent). I 1 Page 1 of 4 p
4、ages Introduction (Thz Introductmn is not part of American NatIonal Standard ANSI/AK PH4.303-1984.) Ttus standard 1s one of a selles that establishes the mm- mum criteria of purity for chemicals used in processing photograptnc materials. Although the ultimate criterion for stntablhty of a photograpt
5、uc-grade chemical 1s Its successful perfor- mance m an appropriate use test. the shorter. more economIcal tests described m tlus standard are gener- ally adequate. This standard IS a revlslon of American NatIonal Standard Speclficatlon for Photographlc Grade Potas- slum Persulfate (Potassmm Peroxydl
6、sulfate). Kz Sz 0,. ANSI PH4.303.1977 In this latest revlslon. the section on physlcdl appearance has been replaced with a sec- tlon on general InformatIon. mmor changes m precau- tlun notations have been made. and the general format has been changed to be m agreement with the style outhncd in the D
7、IrectIves for the Techmcal Work of the International Orgamzatlon for Standardrzatlon (ISO). An Amerwan National Stmdard lmphes a conenrus of those wbstantlally concerned wth 115 scope md provwons An American National Standard 1s Intended a) a gmde to ald the manufacturer, the consumer, and the gener
8、al pubhc. The existence of an American National Stan- dard does not m any respect preclude anyone, whether he has approved the standard or not, from manufacturmg, marketmg, purchasmg, or using products, processes, or procedures not conformmg to the standard American NaUonaJ Standards are subJect to
9、penodlc review and users are cauttoned to obtain the latest edltwns The American NatIonal Standards Institute does not develop standards and wll m no cxcumstances gwe an mterpretation of any American National Standard. Moreover, no person shall hdve the right or authority to lseue an mterpretatlon o
10、f an Amenc.m Naflonal St.mdard m the name of the Amencan Natwnal Standards InWtute. CAUTION NOTICE: T?w American National Standard may bc rewed or wthdrawn at any time. The procedures of the American Natxmal Standards Institute requtre that actmn be taken to reaffirm. rewe. or wthdraw this standard
11、no later than five years from the date of ap- proval. Purchasers of American Natlonal Standards may receive current mformatlon on all standards by callmg or wrltmg the American Na- tmnal Standards Institute. CopyrIght 0 1994 by American National Standards Institute, 1430 Broadway, New York, N.Y. 100
12、19 4NSISC884/4 Page 2 of 4 pages 1. Scope This standard estabhshes crlterla for the purity of photographlc-grade potassmm persulfate and describes the tests to be used to determme the purny. 2. General Information 2.1 Physical Properties. Potassium persulfate exists m the form of white odorless crys
13、tals. granules. or pow- der and 1s water soluble. The chemical formula IS K2 Sz O8 The relative molar mass IS 270.3. 2.2 Hazardous Properties. Potassium persulfate IS a potent oxidlzmg agent. particularly m the presence of strong alkalies. It reacts with many materials: therefore. care shall be exer
14、cised in its use It decomposes under heat to give off oxygen and toxic sulfur trloxlde. 2.3 Handling and Storage Conditions. For storage pur- poses. potassmm persulfate shall be labeled as an oxtdiz- mg material. Store m a cool. dry locatlon separate from combustible. organic. or other readily oxldi
15、Lable mate- rials. 3. Specification Assay (Kz Sz OS ) 98.03 (m/m) mimmum Halides (as Cl). 0 006:; (m/m) maximum Heavy Metals (as Pb), 0 OOSF (m/m) maxnnum Iron (Fe) 0 005% (mini) maxmium Appearance of 12 Solution To pass test NOTE m/m = mass per mass 4. Reagents, Materials. and Glassware 4.1 Reagent
16、s 4.1.1 Reagents shall be handled 111 conformity to health and safety precautions as shown on containers or as given m other sources of such Information Proper labelmg of prepared reagents Includes adequate health and safety precautions. The discharge of reagents shall conform to applicable environm
17、ental regulations. 4.1.2 Reagents used m the test procedures shall be certified reagent-grade chemicals and shall meet the speclflcatlons given m Reagent Chemicals, pubhshed by the Amertcan Chemtcal Societ) (ACS) tn 1981. or chemicals of a purity acceptable to the analysis. The _- Avadable from Amer
18、an Chcmlc.d Socxt) 1155 Sixteenth Street. NM. WashIngon. DC 20036 ANSIIASC PH4.303-1984 acids and ammonia solutions referred to in all the in- structions shall be of full strength unless dilution 1s specified. Dllutlon is specified m terms of norm for example. Pyrex or equivalent. 5. Tests Tests sha
19、ll be made on the samples m the “as received” condition The test procedures described m Sections 6 through 10 shall be followed to determine whether the test sam- ple meets the purity requirements hsted in Section 3. In the last several years. there have been great Im- provemcnts in instrumentation
20、for various analyses. Where such techniques have the equivalent accuracy and preclslon. they may be used m place of the tests described In this standard. 6. Assay 98.0% (m/m) minimum K2 S2 O8 6.1 Standard Sodium Thiosulfate Solution, 0.1 N (NalSzO,). Dissolve 25 grams of sodium thiosulfate. pentahyd
21、rate (Na2 SZ O3 * 5H2 0). and 2 to 3 grams of sodium tetraborate. pentahydrate (Naz Bz O4 * 5H2 0). m 1 liter of boding water. Allow to cool. 6.2 Salicylic Acid Solution, 1% by Weight. Add 10 grams of sahcyhc acid* to 500 mllihters (mL) of dis- tilled water. Stir until dissolved. Dilute to 1 liter w
22、ith water, 6.3 Starch Indicator Solution. Stir 5 grams of soluble starch with 100 mL of 19 sahcyllc acid solution (6.2) Add 300 to 300 mL of boiling water and boll until the stalch dissolves Dilute to 1 hter with water. WARNING: Corrosive, CDUSCS burns. Avwd contact wth eyes, tkm. and clothmp. Wash
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