ARMY MIL-S-12210 A-1956 STRONTIUM OXALATE《草酸锶》.pdf

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1、RIIL-S-12210A 11 JULY 1956 SUPERSEDING 11 SEPTJBBER 1952 12210( ORD) MILITARY SPECIFICATION Q STRONTIUM OXALATE ThZs spec Standard, for MIL-G-2550-General Specification for Ammunition Except Small Arms Ammuni- tion. Testing Purposes. MILITARY STANDARDS MILITARY MIL-STD-129-Marking for Shipment and S

2、torage. (Copies of specifications, standards, drawings, and publications, required by contractors in connection with specific procurement functione, should be ob- tained from the procuring activity or as dird by the contracting officer.) 3. REQUIREMENTS 3.1 Material. Strontium oxalate shall con- for

3、m to the requirementa specified hereafter. 3.1.1 Physical and chemW propertes. Strontium oxalate shall conform to the physi- cal and chemical properties listed in table I for the specified grade, when tested as apeci- fied in 4.4. 3.1.2 Irnpur&%?s. Strontium oxalate shall be free of barium compounds

4、, and shall con- tain not more than a slight amount of cal- cium compounds. Conformance with these requirements shall be determined by the flame test specified in 4.4.7. TABLE I. Chemical and phgstkal popertke. Test -paramph Grade B Property Grade A Color white White Moisture, percent, maximum (max.

5、) 0.25 10.0 4.4.2 Strontium oxalate, percent, minimum (min.) 94.0 84.0 4.3.3 Iron, percent, max . 0.01 4.4.4 Ammonium compounds, percent None 4.4.5 Granulation 4.4.6 Through No. 60 sieve, percent, min . 99.0 Through No. 140 sieve, percent, min. 99.0 R Provided by IHSNot for ResaleNo reproduction or

6、networking permitted without license from IHS-,-,-MllrS-12210A 40 QUALITY ASSURANCX PROVISIONS 4.1 Lot. A lot shall consist of strontium oxalate of the same grade, from not more than one manufacturing batch. A batch shall consist of that quantity of material which has been eubjected to some unit che

7、mical procese or physical mixing process intended to make the final product substantially uni- form 42 Sampling. Ten percent of the con- tainers comprised in a lot, but in no case more than 10 containers, shall be selected so as to be representative of the lot. Approxi- mately 4 ounces of the materi

8、al shall be re- moved from each container in such manner as to obtain portions from the top, middle, and bottom levels of the container, Each riample shall be mixed separately with all lumps in the material broken up so that the entire sample passe., through a No. 10 U.S. sieve conforming to Specifi

9、cation RR-S-366. Each sifted sample shall be divided in half, with one portion placed in LI bottle labeled 80 that the container from which the sample wae obtained can be identified. The remain- ing portions of the primary samples shall be combined, mixed thoroughly, and quartered successively until

10、 a composit sample weigh- ing approximately 4 ounces is obtained. This sample shall be placed in a glass bottle, tightly sealed with a rubber stopper, and the bottle labeled to show the name and grade o9 the niaterial, name of manufacturer, plant, and contract or order number. All acceptance tests (

11、see 4.4) shall be performed on the composite sample. However, if it be- conies apparent during sampling that the lot irr not uniform, the inspector may require that any of the primary samples be tested for compliance with the requirements of this specification. All primary samples shall be held for

12、future testing should the composite sample fail tu comply with the requirements. 4.3 Ineption. Inspection shall be as 4.4 TeiJt procedures. 4.4.1 Reagents. Analytical reagent grade chemicnle aiid distilled water shall be used . specified in Specification MIGG-2550. 2 throughout the tests. Blank dete

13、rminations shall be run in parallel with each test, using the same quantities of reagents used in the test, and corrections shall be applied when significant. 4.4.2 Moisture. The total moisture content (water of crystallization and surface mois- ture) of the material shall be determined as follows :

14、 Weigh approximately 5 grams (gm) of the sample, to the nearest milligram, in a tared weighing dish that has been previously dried at looo to 105OC. Dry the sample for 12 hours in a vacuum of at least 25 inches of mercury and at a temperature of 55O & loC. At the end of the 12-hour period remove the

15、 dish from the oven, cool in a desiccator, and weigh. Calculate the loss in weight of the sample to percent moisture content of the material. (Note: Keep the dried material for use in the strontium oxalate test (see 4.4.3). 4.4.3 Strontium oxalate. The strontium oxalate content shall be determined a

16、s fol- lows : Weigh accurately, in a tared porcelain or platinum crucible that has been previously ignited, a 1-gram portion of the dry material saved from the moisture determination (see 4.4.2). Add 5 mi. of concentrated sulfuric acid and 6 ml. of concentrated nitric acid. Cover the crucible with a

17、 watch glass and carefully evaporate the solution on a hot plate until white fumes are evolved. Remove from the hot plate, cool, add 5 ml. of con- centrated nitric acid, and again carefully evaporate to white fumes. Continue heating until the fumes practically cease, then care- fully heat to dryness

18、 over an open ame, and ignite for 15 miniltes at dull red heat. Cool in a desiccator and weigh. Calculate the weight of strontium sulfate to percentage of strontium oxalate in the dried sample, as follows : Percent strontium oxalate = 95.654 W where : A =weight of strontium sulfate, in grams. W = we

19、ight of sample, in grams., Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-12210A 4.4.4 Iron (Grade A only). The iron con- tent of Grade A material shall be determined as follows : Dissolve an accurately weighed portion of approximately 1 gram

20、of the sample in 5 ml. of concentrated sulfuric acid. (Iron-free reagents should be used through- out this determination. Sulfuric acid con- taining a trace of iron may be used without causing appreciable error if the portions of acid, used as directed, are accurately meas- ured, and taken from the

21、same source.) Heat to complete solution, except for a slight amount of carbon, and cool. Add a few milliliters of concentrated nitric acid and heat until fumes of sulfur trioxide appear. Repeat the treatment with nitric acid until the resulting solution is either colorless or has a light straw color

22、 when finally brought to fumes. Cool and cautiously.add approxi- mately 25 ml. of distilled water. Allow the precipitate to settle out and decant through a filter into a 100-ml. volumetric flask. Add 5 ml. of concentrated sulfuric acid to the residue in the beaker, heat to solution, cool, add approx

23、imately 25 ml. of distilled water, and filter into the same flask. Wash the precipitate with distilled water. Add dilute potassium permanganate solution (O. 1N con- centration is satisfactory) to the combined filtrate and washings in the flask, until a faint pink coloration persists for several minu

24、tes, and then dilute to the 100-ml. mark. Use 2 suitable colorless-glass cylinders of 100- 1. capacity for comparison of the color standard and the sample solutions. In one of the cylinders measure accurately 5 mi. of a standard sulfuric acid-iron solution, con- taining a known quantity of approxima

25、tely 0.00001 gram of ferric iron per ml:, and add 40 ml. of 25-percent sulfuric acid solution. (Note : A standard solution containing 0.00001 gram of ferric iron per ml. may be conveniently prepared as follows : Weigh ac- curately a portion of ferrous ammonium sul- fate (FeSO, (“,) ?SO, * 6H,O), of

26、known purity, to equal 0.0703 gram of the pure salt. Add 50 ml. of 1-to-3 sulfuric acid solution. Warm slightly and add dilute potassium permanganate solution dropwise until a faint pink color persists for several minutes. Di- irl, - A 1- lute the solution to 1 liter with distilled water). To the se

27、cond cylinder add 50 ml. of the sample solution and 20 ml. of the 26- percent sulfuric acid-iron solution. Have the solutions in both cylinders at about 25OC. and add to each solution, avoiding delay between additions, 10 ml. of normal ammonium sul- focyanate solution (containing 76.1 grams of the s

28、ulfocyanate per liter of solution). Dilute to the 100-ml. mark, mix thoroughly, and compare colorimetrically at once. (Note : The coloration fades rapidly if the solutions are hot, but slowly at room temperature. Therefore heat should be avoided and colorimetric comparison made immediately upon the

29、addition of the ammonium sulfocy- anate solution). Report the sample as con- taining less than 0.01 percent iron if the color of the standard solution is darker than that of the sample. 4.4.5 Ammonium compownds (Grade A only). The presence ,of ammonium com- pounds in the material shall be determined

30、 as follows: Warm a small portion (approxi- mately 1 gram) of the sample with a few milliters of 20-percent potassium hydroxide solution. Report the presence of ammonium compounds if the odor of ammonia is de- tected. 4.4.6 Granulation. Place a portion of the sample weighing 25.0 r+ 0.1 grams on the

31、 specified standard testing sieve conforming to Specification RR-S-366 (see table 1). Shake and rub the sample lightly with a spatula so as to break up aggregates of the material, working as much of the sample as possible through the sieve. Determine the weight of the material retained on the sieve,

32、 and calculate the percentage that has passed through. 4.4.7 Impwritzes. The presence of impuri- ties in the material shall be determined by ame test as follows: Ignite a portion of the sample to destroy the organic matter. Mois- ten with concentrated hydrochloric acid and subject to a Aame test, us

33、ing a platinum wire. The flame shall show the scarlet coloration characteristic of strontium, with no detect- able green coloration due to barium. Only 3 i- s . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a short flash of yellowish-red coloration

34、, due to calcium, is permissible. 4.8 Resubmieeion and retest, If the com- posite sample, or any primary sample sub- jected to test, fails to pass the test, the lot shall be rejected. The contractor shall have the option of having a partial or complete analysis made on samples from any or all of the

35、 containers in the lot at no expense to the Government, The contractor may then re- move the defective portions of the lot and resubmit the lot for acceptance. The resub- mitted lot shall be accepted provided that new samples, selected in accordance with 4.2, pass all the tesia required by this spec

36、ifica- tion and that 3 additional primary sample8 pasa any test or tests failed by material on original submission. 5. PREPGRATXON FOR DELn7ERY 5.1 Packaging, 5.1.1 Level C. Unless otherwise specied, atrontfum oxalate shall be packaged in com- mercial packages, 52 Packing. 5.2.1 Level C. Unless othe

37、rwise specified, unit packages of the material (see 6.1) shall bo packed in standard commercial containere, so constructed as to insure acceptance by common or other carriers, for safe trans- portation, at the lowest rate of the carrier, to the specified point of delivery. 4 5.3 Marking. In addition

38、 to any special markings required by the contract or order, the unit packages and the shipping con- tainers shall be marked in accordance with Standard MIGSTD-129. 6. NOTES 6.1 Ordering data. Procurement docu- (a) Title, number, and date of this (b) Grade of material required (see (c) Any special ma

39、rkings required (see Notice. When Government drawings, epecuica- tions, or other data are used for any purpose other than in connection with a definitely related Govern- ment procurement operation, the United States Government thereby incur no responsibility nor any obiigation whatsoever: and the fa

40、ct that the Govern- ment may have formulated, furnished, or in any way supplied the said drawinga, epecificationa, or other data is not ta be regarded by implication or other- wise as in any manner licensing the holder or any other peraon or corporation or conveying any rights or permiseion ta manuf

41、acture, use, or sell any patented invention that may be in any way-related thereto. Cuatodlans: Army-rnance Corps ments should specify the following: specification. 1.2). 5.3). Preparing activity: Army-Ordnance Carpe Navy4ureau of Oninance Other interest: hY-c Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-