1、MIL-S-24521A( SH) 20 June 1986 SUPERSEDING MIL-S -2452 1 (SHIPS) 2 September 1975 (See 6.5) NILITARY SPECIFICATION SODIUM NITRITE, TECHNICAL This specification is approved for use within the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies o
2、f the Department of Defense. 1. SCOPE 1.2 Scope. This specification covers technical grade sodium nitrite for use as an anti-corrosive agent in boiler preparation. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a
3、part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation, SPECIFICATIONS FEDERA
4、L PPP-D-723 - Drums, Fiber. PPP-C-2020 - Chemicals, Liquid, Dry and Paste: Packaging of. STANDARDS FEDERAL FED-STD-313 - Material Safety Data Sheet Preparation and Submission of. I I Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving t
5、his document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 6810 DISTRI
6、BUTION STATEMENT A Approved for public release; distribution unlimited I THIS DOCUMENT CONTAINS - a- - PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S -2452 IA (SH) 11 I LITARY NIL-STD-105 - Sampling Procedures and Tables for Inspection
7、by NIL-STD-129 - Marking for Shipment and Storage. MIL-STD-147 - Palletized Unit Loads. Attributes. 2.1.2 Other Government documents. The following other Government documents forms a part of this specification to the extent specified herein. otherwise Specified, the issues shall be those in effect o
8、n the date of the solicitation. Unless DEPARTNENT OF TRANSPORTATION (DOT) Code of Federal Regulations (CFR) 49 CFR, Parts 170-179 - Hazardous Material Regulations. DEPARTNENT OF LABOR Occupational Safety and Health Administration (OSHA) Code of Federal Regulations (CFR) 29 CFR, Part 1910.1200 - Haza
9、rd Communication Standard. (The Code of Federal Regulations (CFR) and the Federal Register (FR) are for sale on a subscription basis by the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. When indicated, reprints of certain regulations may be obtained from the Fed
10、eral agency responsible for issirance thereof. ) (Copies of specifications, standards and other Government documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Other publi
11、cations. The following documents form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted shall be those listed in the issue of the DoDISS specified in the solicitation. the issues of documents not listed in the D
12、oDISS shall be the issue of the nongovernment documents which is current on the date of the solicitation. Unless otherwise specified, AklERIGAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 1193 - Standard Specification for Reagent Water. (DoD adopted) B 1293 - Standard Test Methods for pH of Water and
13、 Waste Water. (DoD adopted) (Application for copies shou1.d be addressed to the American Society for Testing and Platerials, 1916 Race Street, Philadelphia, PA 19103.) AMERICAN CHEFIICAL SOCIETY (ACS) Specifications - Reagent Chemicals. (Application for copies should be addressed to Applied Publicat
14、ions, American Chemical Society, 1155 16th Street, NW, Washington, DC 20006.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2452LA 68 m 797770b OLL8772 7 m Constituent or property MIL-S -2452 1A (SH) Value Percent by weight Test paragraph a
15、 L e m _-_- - - - (Nongovernment standards and other publications are normally available from the organizations which prepare or which distribute the documents. ments also may be available in or through libraries or other informational services.) These docu- 97. O (minimum) O. 2 (maximum) 0.2 (maxim
16、um) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards), the text of this specifi- cation shall take precedence. Nothing in this specification, h
17、owever, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Material. Sodium nitrite shall be in the form of anhydrous crystals and shall conform to the formula, NaNO,. 3.2 Chemical requirements. The sodium nitrite shall conform to the c
18、hemi- cal requirements specified in table I when tested as specified in 4.3. TABLE I. Chemical requirements. Sodium nitrite Sulfates (as Na,SO,) Chlorides (as NaCl, Insoluble matter pH value 4.3.3 4.3.4 4.3.5 4.3.2 4.3.6 3.3 Material safety data sheet. The contracting activity shall be provided a ma
19、terial safety data sheet (MSDS) at the time of contract award. The MSDS shall be provided in accordance with the requirements of FED-STD-313 and 29 CFR 1910.1200. When FED-STD-313 is at variance with the CFR, 29 CFR 1910.1200 shall take precedence, modify, and supplement FED-STD-313. 4. QUALITY ASSU
20、RANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. in the contract or purchase order, the contractor may use his own or any other facil
21、ities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services con
22、form to prescribed requirements. Except as otherwise specified 4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this specification shall be- come a part of the contractors overall inspection system or quality program. The abse
23、nce of any inspection requirements in the specification shall not relieve 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S -2452 1A (SH) the contractor of the responsibility of assuring that all products or supplies submitted to the Government
24、 for acceptance comply with all requirements of the contract. Sampling in quality conformance does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. 4.2 Quality conformance inspection. 4.2.1 Lot an
25、d batch. For the purpose of sampling and inspection, a lot shall consist of sodium nitrite from one batch offered for delivery at one time, but not to exceed 24 consecutive hours under essentially the same manufacturing conditions and with no change in materials, providing the operation is continu-
26、ous. chemical or physical mixing process intended to make the final product substan- tially uniform. constitute a lot. A batch is that quantity of material which has been subjected to some unit In the event the process is a batch operation, each batch shall 4.2.2 Sample for tests. Ten primary sample
27、s of equal weight, 25 grams each, shall be randomly selected from each lot of material and thoroughly mixed to form a composite sample representative of the lot. labeled to identify the sample with the lot represented. If there are less than 10 containers in a lot, a sample shall be taken from each
28、container. The compo- site sample shall be subjected to the tests of 4.3. A lot shall be unacceptable if a sample fails to meet any of the test requirements specified herein. The container shall be 4.2.3 Examination of filled containers. A random sample of filled containers, taken from each lot in a
29、ccordance with MIL-STD-105 at inspection level I and acceptable quality level of 2.5 percent defective, shall be examined to verify compliance with all stipulations of this specification regarding fill, closure, marking, and other requirements not involving tests. Samples shall be examined for defec
30、ts of the container and closure, for evidence of leakage, and for unsatisfactory markings. Each sample filled container shall also be weighed to determine the amount of the contents. Any container in the sample having one or more defects or under required fill shall be rejected, and if the number of
31、 defective containers in any sample exceeds the acceptance number for the appropriate sampling plan in accordance with MIL-STD-105 the lot represented by the sample shall be rejected. 4.3 Test methods. Unless otherwise specified (see 6.2), the physical and chemical values specified in 3.1 and table
32、I shall apply to the average of two determinations made on the unit of product. I, 4.3.1 Reagent water conforming to type III grade of ASTM D 1193 and reagent chemicals conforming to American Chemical Society specifications shall be used throughout the tests. Sodium nitrite shall be weighed as recei
33、ved. Unless otherwise specified herein, solutions Weighings shall be made to the nearest- 0.0001 gram. I shall be made up on a weight basis. I 4 4.3.2 Insoluble matter. Dissolve 25 grams of sample in 250 milliliters (mL) of water, heat to boiling, and digest in a covered beaker on a steam bath or 1
34、hour. Filter the liquid through a tared sintered glass crucible (fine porosity with a nominal maximum pore diameter of 5 micrometers (rim) which has been dried to constant weight at 110 f 2 degrees Celsius (OC). Quantitatively Provided by IHSNot for ResaleNo reproduction or networking permitted with
35、out license from IHS-,-,-MIL-S -2452 lA(SH) transfer insoluble matter to the crucible by thoroughly washing the beaker with hot reagent water. (see 4.3.4) and chloride (see 4.3.5). weight at 110 It 2OC. The combined filtrate and wash water are retained for sulfate Dry the filtering crucible to const
36、ant The percent insoluble matter is calculated as follows: 100 (A-B) W Percent insoluble matter = Where: A = Weight of crucible plus residue in grams B = Weight of crucible in grams W = Weight of sample in grams 4.3.3 Sodium nitrite. Dissolve 10 grams of sample in water and dilute to 1000 mL in a vo
37、lumetric flask. Add 5 mL of concentrated sulfuric acid to 300 mL of water in a 600 mL beaker. Stir, and while the solution is still warm, add 0.1N potassium permanganate until a faint pink color is produced which persists for 2 minutes. Pipet 10.0 mL of the diluted sample, slowly and with constant a
38、gitation, into the solution in the 600 mL beaker. Keep the tip of the pipet well below the surface of the liquid. Add 15.0 mL of 0.1N ferrous ammonium sulfate and allow the solu- tion to stand for 5 minutes. Titrate the excess of ferrous ammonium sulfate with 0.1N potassium permanganate and record t
39、his value as A. sodium nitrite as follows: Add 40.0 mL of 0.1N potassium permanganate and stir gently. Calculate the percent O. 3458 W Percent sodium nitrite = Where : A = mL of 0.1N potassium permanganate used to back titrate W = Weight of sample in aliquot in grams 4.3.4 Sulfate. Cool the filtrate
40、 and washings retained from 4.3.2. Quan- titatively transfer the solution to a 500 mL volumetric flask and dilute to volume. Pipet 200 mL of this solution into a 400 mL beaker. Add methyl orange indicator. Add sufficient hydrochloric acid to make the solution just acidic to methyl orange. Heat to bo
41、iling. Add dropwise, while stirring, 10 mL of 10 percent barium chloride solu- tion. Remove the solution from the hot plate and allow the precipitate to settle. Filter the solution through a tared sin- tered glass crucible (having a nominal maximum pore diameter of 5 um) which has been dried to cons
42、tant weight at 110 k 2OC. Quantitatively transfer the preci- pitate to the filter. Wash with hot reagent water until the filtrate is free of chloride as indicated by the absence of a precipitate in a silver nitrate solu- tion. The percent sodium sulfate is calculated as follows: Add 2 mL of concentr
43、ated hydrochloric acid in excess. Continue. boiling for 5 minutes. Dry the filtering crucible to constant weight at 110 rt 2OC. 60-9 (A-B) W Percent sodium sulfate = Where : A = Weight of precipitate plus crucible in grams B = Weight of crucible in grams W = Weight of sample in aliquot in grams 5 Pr
44、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S -245 2 1A (SH) 4.3.5 Chloride. Pipet 200 mL of sample from the solution prepared from the filtrate and washings of 4.3.2 into a 400 mL beaker. Add 5 mL of concentrated nitric acid. Doi1 gently for 5
45、 minutes. Add 10 mL of approximately 0.1 silver nitrate dropwice with constant stirring and continue boiling for an additional 5 minutes. Allow the precipitate to settle. Test the supernatant liquid with a few drops of 0.1N silver nitrate for complete- ness of precipitation. If precipitation is not
46、complete, add an additional 5 mL of 0.N silver nitrate, boil as indicated above, and retest the supernatant. When precipitation is complete, filter the solution through a tared sintered glass crucible (having a nominal maximum pore diameter of 5 rim) which has been dried to constant weight at 110 k
47、2OC. to the filter. Wash with hot reagent water. Use 1:lOO nitric acid for trans- forring and washing of the precipitate. weight at 110 -t- 2C. Remove solution from the hot plate. Quantitatively transfer the precipitate Dry the filtering crucible to constant The percent sodium chloride is calculated
48、 as follows: 40.8 (A-B) W Percent sodium chloride = Where: A = Weight of crucible plus precipitate in grams B = Weight of crucible in grams W = Weight of sample in aliquot in grams 4.3.6 pH value. Dissolve 2 rt 0.005 grams of sample into 200 mL of neutral reagent water. ASTM D 1293. Determine the pH
49、 value of the solution in accordance with e 4.4 Inspection of packaging. Sample packages and packs, and the inspec- tion of thi preservation-packaging, packing and marking for shipment and storage shall be in accordance with the requirements of section 5 and the documents spocified therein, 5. PACKAGING (The packaging requirements specified herein apply only for direct Government acquisition. ) 5.1 Preservation-packaging and packing levels A, B and C. Unless otherwise sp
