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MIL-A-8243B <br /> 4.3.4 Water content - Water content shall be determined in <br /> accordance with ASTM method D 1123. <br /> 4.3.5 Phosphate content - <br /> 4.3.5.1 Preparation of reagent - Fifty grams of crystalline <br /> magnesium chloride (MP-C12.6H2O) and 100 grams of ammonium chloride shall be <br /> dissolved in 500 milliliters of water. Approximately 10 milliliters of <br /> concentrated aqueous ammonia.shall be added and the resultant solution <br /> allowed to stand overnight. It shall be filtered if a precipitate appears. <br /> The solution shall then be made slightly acid with hydrochloric acid after <br /> which it shall be diluted to 1 liter and placed in a glass-stoppered bottle. <br /> 4.3.5.2 Procedure - A 20-gram sample of the anti-icing fluid, <br /> weighed to the nearest 0.01 gram, shall be diluted with 100 milliliters of <br /> distilled water. Ten milliliters of a mixture of equal parts by volume of <br /> concentrated hydrochlorio acid and water and 30 milliliters of the reagent <br /> prepared in accordance with 4.3.5.1 shall be added to the diluted sample. <br /> Concentrated aqueous ammonia shall then be added until the solution is <br /> neutral to methyl red indicator. The solution shall be stirred for 5 minutes <br /> and as stirring is continued, an additional 15 milliliters of aqueous <br /> ammonia shall be added. The solution shall then be allowed to stand for <br /> 4 hours or longer after which it shall be filtered and the magnesium <br /> pyrophosphate precipitate ignited in a weighed platinum crucible at 10000 <br /> to 1050QC (18320 to 19220F) until constant weight is reached. The dibasic <br /> potassium phosphate content shall be computed as follows: <br /> dibasic potassium phosphate content (:percent) 1.565 x M x 100 <br /> W <br /> where <br /> M = weight of the magnesium pyrophosphate precipitate, grams. <br /> W = weight of the sample, grams. <br /> 4.3.6 Sodium di-(2-ethylhexvl) sulfosuccinate content - <br /> 4.3.6.1 Reagents - The following reagents shall be used in <br /> the determination of the sodium di(2-ethylhexyl) sulfosuccinate content of <br /> the anti-icing fluid: <br /> 6 <br />