ARMY MIL-L-13788-1954 LEAD SALICYLATE《水杨酸铅》.pdf

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1、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-hL 13788 (Ord) 3.1 Form.-Soft crystals. 3.2 Color.- White. 3.3 Lead content.-43.0 percent, minimum. 3.4 Saicyate content. -55.1 percent , minimum. 3.5 Volatile matter.O.25 percent, maximum. 3.6 Grznulat

2、ion.-Not more than 0.1 percent of the lead salicylate shall bei retained on e. U. S. Standard No. 325 sieve. 3.7 Workmanship.-lhe lead salicylate shall be free of foreign material such as dirt, grit and other extraneous material. 4. QUALITY ASSURANCE PROVIsIOliS 4.1 3.4 lot shall consist o: materid

3、from the same batch or blending operation, subjected to the same processing operations and conditions. 4.2 :Sampling.-Ten percent, but in no case more than 10 nor fewer than 3,of the containerstshall be selected by the inspector so as to be representative of the lot, If there are fewer than 3 contai

4、ners in the lot, all the containers shall be sampled. The material shall bs mixed to a ipriFtorm consistency throughout and approximately 8 ounces of it shall be taken from each selected container. Each of these primary samples shall be placed Baa sn airtight container and labeled so that the contai

5、ner from which it was %,alien cati be identified. ounces shall be mada from equal porbions of the primary samples. sample shall be %horoughIy mhed and placed i an airtight container labeled to show the name of the material, manufactures, plant, contract or purchase order number and lot size. All acc

6、eptance tests shall be made on the composite sample. it becomes apparent dining sampling that the lot is not uniform, the inspector may require that any primary sample be tested for compliance with the requirements of the specification. should the composite sample fail to comply with the requirement

7、s. approxbately 1 am of the sample to a 150-mi beaker. Add 10 ml of distilled water, and then add slowly, mith stirring, 20 ml of a solution consisting of equal parts by volume of concentrated nitric acid and concentrated sulfuric acid. Place the beaker and contents on a hot plate and heat until den

8、se white fumes of sulfur trioxide are evolved. acid, and heat again until dense fumes of sulfur trioxide are evolved. addition of nitric acid and heating to fumes until all the organic matter is destroyed and the sulfur;ic acid solution is practically colorless. Remove the beaker from the hot plate

9、and allow it to cool. Wash down the side walls of the beaker with about 10 ml of distilled water, and again heat to fumes of sulfur trioxide. and contents to cool, then cautiously dilute to about 100 ml with distilled water. Again allow the mixture to cool, add 25 m of ethyl alcohol, and let stand f

10、or at least 2 hours. crucible. acid solution directed from a wash bottle. sulfuric acid solution and twice with 95-percent ethyl alcohol. Aspirate the crucible A composite sample of approximately 8 The composite However, if All primary samples shall be held for possible future examination 4.3 Inspec

11、tion.-Inspection shall be as specified in Specification %IL-G-2550, 4.4 Determination of lead content.-Transfer an accurately weighed portion of Allow the beaker to cool for about 2 minutes, add 5 rnl of concentrated nitric Repeat the Allow the beaker Filter the precipitate of lead sulfate, using a

12、tared gooch type Transfer the precipitate to the crucible with a stream of 1:20 sulfuric Wash the precipitate three times with the . 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-L37 68 m 7797706 OLL6531 2 m 7 MIL-L- 137% (grd) and contents

13、 until the dor of alcohol is no Longer detectable with the vacuum line turned off. furnace at 550 to 600% for 15 minutes, cool in a desiccator and weigh. Calculate the gain in weight of the crucible to percent lead in the sample as follows: Dry in an oven for 30 minutes at looo to 15OC, ignite in a

14、muffle Percent lead = 60.3% W where : A = gm of ignited residue W = gm of sample 4.5 Determination of salicylate content. -Transfer an accurately weighed psrtioo of approximately 0.20 gram of the sample to a 500 ml iodine flask. pissolve the sample in 10 ml of i sodium hydroxbde solution, and dilute

15、 to approximately i50 ml with distilled water. and i5 gm KBr per liter), measured accurately from a pipette, to the contents 02 the flask. pour a few nCi of for 30 and the fact that the Gout furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by i

16、mplication or otherwise as in any menner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use or sell any patented invention that may in any way be related I thereto. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-