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MIL-A-824'_:. <br /> a. 0.4N sodium periodate solution (prepared by weighing out <br /> exactly 10.6 grams of metasodium periodate, Na104i and dissolving in <br /> sufficient distilled water to make 1 liter of solution) . <br /> b. 0.2N sodium thiosulfate solution. <br /> C. 30 percent potassium iodide solution. <br /> d. Starch solution. <br /> e. 20 percent sulfuric acid solution. <br /> 4.3.3.2, Procedure - Three and five-tenths to four grams of <br /> the anti-icing fluid shall be weighed by difference in a 250-milliliter <br /> volumetric flask. The weight shall be determined to the nearest 0.1 milli- <br /> gram. The flask shall then be filled to the 250-milliliter mark with <br /> distilled water and the solution mixed thoroughly. A 10-milliliter aliquot <br /> of the solution shall be transferred to a 500-milliliter iodine flak�k. <br /> Fifty milliliters of the 0.4N sodium periodate solution shall then be added, <br /> the flask stoppered, and the mixture allowed to react. Two blanks shall <br /> be run in the same manner. After 1 hour, 150 milliliters of distilled <br /> water shall be added to the sample mixture, followed by the addition of <br /> 20 milliliters of the 20-percent sulfuric acid solution and 40 milliliters <br /> of the 30-percent potassium iodide solution. (The potassium iodide solution <br /> should be added by pouring it around the stopper thus forming a liquid seal <br /> between the stopper and the neck of the flask to absorb any liberated iodine <br /> vapors.) The sample mixture shall be allowed to react for 10 minutes, <br /> agitating frequently, after which the neck and sides of the flask shall be <br /> rinsed with distilled water from a wash bottle. The sample and the blanks <br /> shall then be titrated to a pale yellow iodine color with standardized <br /> 0.2N sodium thiosulfate. Two milliliters of starch solution shall be <br /> added and the solutions titrated to the disappearance of the blue color. <br /> The blanks should each require 95 to 100 milliliters of the thiosulfate and <br /> the sample mixtures 78 to 90 milliliters. The 1,2-glycol content shall be <br /> computed as follows: <br /> # 1,2-glycol content (percent)= O.Pj3O x 25 x (B-S) x N x 100 <br /> W <br /> where <br /> B== ml of thiosulfate solution required by the blank (average of <br /> two blank runs) . <br /> S = ml of thiosulfate solution required by the sample aliquot. <br /> N = normality of the thiosulfate solution. <br /> W = weight of the sample, grams. <br /> 5 <br />