1、Comments, suggestions, or questions on this document should be addressed to Defense Logistics Agency Aviation VEB, 8000 Jefferson Davis Highway, Richmond, VA 23297-5616, or e-mailed to STDZNMGTdla.mil. Since contact information can change, you may want to verify the currency of this address informat
2、ion using the ASSIST database at https:/assist.daps.dla.mil/. AMSC N/A FSC 6810 METRIC MIL-DTL-11751G 15 September 2010 SUPERSEDING MIL-DTL-11751F 1 February 2000 DETAIL SPECIFICATION POTASSIUM HYDROXIDE SOLUTION This specification is approved for use by all Departments and Agencies of the Departmen
3、t of Defense. 1. SCOPE 1.1 Scope. This specification covers four classes of aqueous potassium hydroxide solution. 1.2 Classification. The potassium hydroxide solution is of the following classes and unit quantity, as specified (see 6.2): 1.2.1 Classes. Class 1 - 34 percent solution Class 2 - 50 perc
4、ent solution Class 3 - 30 percent solution Class 4 - 40 percent solutionProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-11751G 2 1.3 Part or identifying number (PIN). The PIN to be used for potassium hydroxide solution acquired to this specif
5、ication is created as follows: M 11751 - X Class: 1 - 34 percent solution 2 - 50 percent solution 3 - 30 percent solution 4 - 40 percent solution Specification number Denotes military specification 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3
6、and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all
7、specified requirements of the documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Non-government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are
8、 those cited in the solicitation or contract. ASTM INTERNATIONAL ASTM D891 - Standard Test Methods for Specific Gravity, Apparent, of Liquid Industrial Chemicals (Copies of this document are available online at http:/www.astm.org/ or from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, Wes
9、t Conshohocken, PA 19428-2959.) AMERICAN WATER WORKS ASSOCIATION (AWWA) AWWA B511 - Potassium Hydroxide (Copies of this document are available online at http:/www.awwa.org/ or from AWWA, 6666 West Quincy Avenue, Denver, CO 80235-3098.) 2.3 Order of precedence. Unless otherwise noted herein or in the
10、 contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for Res
11、aleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-11751G 3 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.3. 3.2 Toxic chemicals, hazardous substances, and ozone depleting substan
12、ces (ODS). The use of toxic chemicals, hazardous substances, or ODS shall be avoided, whenever feasible. 3.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the mate
13、rial meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.4 Appearance. Potassium hydroxide solution shall be colorless to pale yellow when tested as specified in 4.5.2. 3.5 Physical and chemical characteristics. 3.5.1 Class 1. Cla
14、ss 1 potassium hydroxide solution shall conform to the chemical characteristics in table I when tested as specified herein. TABLE I. Class 1 characteristics. Percent by weight Characteristic Minimum Maximum Test paragraph Potassium hydroxide Potassium carbonate 32.0 - 36.0 3.0 4.5.3 4.5.3 3.5.2 Clas
15、s 2. Class 2 potassium hydroxide solution shall conform to the chemical characteristics in table II when tested as specified herein. TABLE II. Class 2 characteristics. Characteristic Minimum Maximum Test paragraph Potassium hydroxide, percent by weight Potassium carbonate, percent by weight Specific
16、 gravity at 15/4C 45.0 - 1.455 50.0 3.0 1.515 4.5.3 4.5.3 4.5.4 3.5.3 Class 3. Class 3 potassium hydroxide solution shall conform to the chemical characteristics in table III when tested as specified herein. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
17、S-,-,-MIL-DTL-11751G 4 TABLE III. Class 3 characteristics. Characteristic Minimum Maximum Test paragraph Potassium hydroxide, percent by weight Potassium carbonate, percent by weight Chloride Nitrogen compounds (as N) Phosphate Sulfate Ammonium hydroxide precipitate, percent by weight Heavy metals (
18、as Ag) Iron Sodium Foam Particulate Filterable non-volatile residue (mg/L)129.5 - - - - - - - - - - - - 30.5 0.90 to pass test to pass test to pass test to pass test 0.01 to pass test to pass test to pass test to pass test to pass test 50.0 4.5.3 4.5.3 4.5.5 4.5.6 4.5.7.3 4.5.8 4.5.9 4.5.10 4.5.11 4
19、.5.12.4 4.5.13 4.5.14 4.5.15.3 1Milligrams per liter (mg/L). 3.5.4 Class 4. Class 4 potassium hydroxide solution shall conform to the chemical characteristics in table IV when tested as specified herein. TABLE IV. Class 4 characteristics. Characteristic Minimum Maximum Test paragraph Potassium hydro
20、xide, percent by weight Potassium carbonate, percent by weight Chloride Nitrogen compounds (as N) Phosphate Sulfate Ammonium hydroxide precipitate, percent by weight Heavy metals (as Ag) Iron Sodium Foam Particulate Filterable non-volatile residue (mg/L) 39.5 - - - - - - - - - - - - 40.5 0.90 to pas
21、s test to pass test to pass test to pass test 0.01 to pass test to pass test to pass test to pass test to pass test 50.0 4.5.3 4.5.3 4.5.5 4.5.6 4.5.7.3 4.5.8 4.5.9 4.5.10 4.5.11 4.5.12.4 4.5.13 4.5.14 4.5.15.3 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified
22、herein are classified as follows: a. First article inspection (see 4.3). b. Conformance inspection (see 4.4). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-11751G 5 4.2 Inspection conditions. All inspections shall be performed on a lot. A l
23、ot shall consist of the potassium hydroxide solution of one class, produced by one manufacturer in no more than 24 hours, at one plant, from the same materials, and under essentially the same manufacturing conditions, provided the operation is continuous. In the event the process is a batch process,
24、 each batch shall constitute a lot. 4.3 First article inspection. First article inspection shall be performed on a representative sample of the first lot produced when a first article sample is required (see 3.1). This inspection shall include the requirements in tables I, II, III, and IV, and the t
25、ests of 4.5. 4.4 Conformance inspection. Conformance inspection shall be performed in accordance with the inspection provisions set forth herein. The characteristics shown in tables I, II, III, and IV, when tested in accordance with 4.5, shall constitute minimum inspections to be performed by the su
26、pplier prior to government acceptance or rejection by lot. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the respo
27、nsibility of assuring that all products or supplies, submitted to the government for acceptance, comply with all requirements of the contract. Failure of any test, by any sample, shall be cause for rejection of the lot. 4.5 Test methods and procedures. 4.5.1 Test specimen preparation. Containers of
28、potassium hydroxide solution shall be mixed thoroughly by rolling or other means before sampling. A representative specimen of approximately 125 grams (g) shall be removed from each class 1 and class 2 sample container and placed in a suitable, clean, dry container labeled to identify the lot or bat
29、ch and the container from which it was taken. A representative specimen of approximately 400 milliliters (mL) shall be removed from each class 3 and class 4 sample container and placed in a suitable, clean, clear, dry container labeled to identify the lot or batch and the container from which it was
30、 taken. Exposure of the specimen to the atmosphere shall be kept to a minimum to avoid absorption of water and carbon dioxide. 4.5.2 Appearance. Visually examine the specimen for color (see 3.4). 4.5.3 Potassium hydroxide and potassium carbonate. Determine the percentage by weight of potassium hydro
31、xide and potassium carbonate of the specimen in accordance with test methods of AWWA B511. 4.5.4 Specific gravity. Determine the specific gravity of the specimen at 15/4C in accordance with method A of ASTM D891. 4.5.5 Chloride. Rapidly weigh 100 g of the class 1, class 3, or class 4 specimen or 6 g
32、 of the class 2 specimen to within 0.1 g and dilute to 1 liter using carbon dioxide-free water to produce solution “A“. Dilute 20 mL of solution “A“ with water and filter if necessary through a chloride-free filter. To 5 mL of the diluted solution, add 15 mL of water, 1 mL of nitric acid, and 1 mL o
33、f 1.7 percent silver nitrate solution. Any turbidity produced shall be no greater than Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-11751G 6 that produced by 0.01 milligrams (mg) of chloride ion in an equal volume of solution containing th
34、e quantities of reagents used in the specimen test. 4.5.6 Nitrogen compounds. Dilute 20 mL of solution “A“ prepared in 4.5.5 with 50 mL of ammonia-free water in a flask connected through a spray trap to a condenser, the end of which dips beneath the surface of 10 mL of 0.1 N hydrochloric acid. Prepa
35、re a control by placing 50 mL of ammonia-free water in a similar flask and adding 10 mL of solution “A“ and a solution of an ammonium salt containing 0.01 mg of combined nitrogen. To each flask, add 0.5 g of aluminum wire in small pieces, allow to stand for 1 hour, and slowly distill about 35 mL. To
36、 each distillate, add 2 mL of freshly boiled 10 percent sodium hydroxide solution, dilute to 50 mL with ammonia-free water, and add 2 mL of Nessler reagent. Any color produced in the specimen solution shall be no greater than that produced in the control. 4.5.7 Phosphate. 4.5.7.1 Ammonium molybdate
37、solution. Dissolve 50 g of ammonium molybdate in 1 liter of 1 N sulfuric acid. 4.5.7.2 p-Methylaminophenol sulfate solution. Dissolve 2 g of p-methylaminophenol sulfate in 100 mL of water. To 10 mL of this solution, add 90 mL of water and 20 g of sodium bisulfate. Confirm the suitability of the solu
38、tion by the following test: Add 1 mL of the solution to each of four solutions containing 25 mL of 0.5 N sulfuric acid and 1 mL of the ammonium molybdate solution prepared in 4.5.7.1. Add 0.005 mg of phosphate ion to one of the solutions, 0.01 mg to a second, and 0.02 mg to a third. Allow to stand a
39、t room temperature for 2 hours. The three solutions should show readily perceptible differences in blue color corresponding to the relative amounts of phosphate added. The solution to which 0.005 mg of phosphate was added should be perceptibly bluer than the blank control. 4.5.7.3 Procedure. To 40 m
40、L of solution “A“ prepared in 4.5.5, add 10 mL of hydrochloric acid and evaporate to dryness on a steam bath. Dissolve the residue in 25 mL of approximately 0.5 N sulfuric acid, add 1 mL of the ammonium molybdate solution prepared in 4.5.7.1, and 1 mL of the p-methylaminophenol sulfate solution prep
41、ared in 4.5.7.2. Allow to stand for 2 hours at room temperature. Any blue color produced shall be no darker than that produced by 0.02 mg of phosphate ion in an equal volume of solution containing the quantities of reagents used in the specimen test, including the residue from evaporation of 5 mL hy
42、drochloric acid. 4.5.8 Sulfate. Neutralize 250 mL of solution “A“ prepared in 4.5.5 with hydrochloric acid and add an excess of 2 mL of hydrochloric acid. Heat to boiling, add 10 mL of 12 percent barium chloride solution, digest in a covered beaker on a steam bath for 2 hours, and allow to stand ove
43、rnight. If a precipitate is formed, filter, wash thoroughly, and ignite. The weight of the precipitate shall be no more than 0.0012 g greater than the weight obtained in a complete blank test. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-1
44、1751G 7 4.5.9 Ammonium hydroxide precipitate. Cautiously add 12 mL of sulfuric acid to 12 mL of water, cool, add the mixture to 100 mL of solution “A“ prepared in 4.5.5, and evaporate to dense fumes. Cool, dissolve the residue in 130 mL of hot water, and add ammonium hydroxide until the solution is
45、just alkaline to methyl red. Heat to boiling, filter, wash with hot water, and ignite. Calculate the percent by weight ammonium hydroxide precipitate as follows: Percent ammonium hydroxide precipitate = 100 x A W where: A = Weight of residue in grams. W = Weight of specimen in grams. 4.5.10 Heavy me
46、tals. To 30 mL of solution “A“ prepared in 4.5.5, cautiously add 15 mL of nitric acid. Prepare a control by adding 0.04 mg of silver ion to 10 mL of solution “A“ and cautiously adding 15 mL of nitric acid. Evaporate both solutions to dryness over a low flame or on an electric hot plate. Dissolve eac
47、h residue in about 20 mL with water. Adjust the pH of each solution to between 3 and 4 (using a pH meter) with 1 N acetic acid or ammonium hydroxide solution containing 10 percent ammonia. Dilute to 40 mL with water and mix. Add 10 mL of freshly prepared hydrogen sulfide water to each and mix. Any y
48、ellowish brown color produced in the specimen solution shall be no darker than that produced in the control. 4.5.11 Iron. Neutralize 20 mL of solution “A“ prepared in 4.5.5 with hydrochloric acid using phenolphthalein indicator. Add 2 mL of hydrochloric acid in excess and dilute to 50 mL with water.
49、 Prepare a control by adding 0.01 mg of iron and 2 mL of hydrochloric acid to the residue obtained from evaporation of the quantity of hydrochloric acid used to neutralize the specimen solution. Dilute to 50 mL with water. To each solution, add 30 to 50 mg of ammonium persulfate and 3 mL of 30 percent ammonium thiocyanate solution. Any red color produced in the specimen solution shall be no darker than that produced
