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MIL-A-824'3 <br /> a. Standard sodium di-(2-ethylhexyl) sulfosuccinate solution pre- <br /> pared by transferring '0.8 grams of pure sodium di-(2-ethylhexyl) sul- <br /> fosuccinate, weighed to the nearest 0.1 mg, to a 250-milliliter glass- <br /> stoppered volumetric flask and diluting to the mark with distilled water. <br /> This solution shall be agitated (a mechanical shaker may be used) until <br /> complete solution is effected. Solutions over two weeks old shall be <br /> discarded. <br /> b. Methylene blue chloride solution prepared by weighing out <br /> 0.050 f 0.005 gram of c.p. methylene blue chloride and dissolving in <br /> 1 liter of distilled water, then carefully adding 10 milliliters of con- <br /> centrated c.p. sulfuric acid and 50 grams of anhydrous sodium .sulfate, <br /> then mixing thoroughly to effect complete solution. <br /> c. 0.005 N. cetyl pyridinium bromide prepared by dissolving 2.5 <br /> grams of cetyl pyridinium bromide in 1 liter of distilled water and filter- <br /> ing the solution. <br /> 4.3.6.2 Procedure - One hundred and fifty grams of the anti- <br /> icing fluid shall be weighed by difference in a 250-milliliter volumetric <br /> flask, The weight shall be determined to the nearest 0.1 gram. The flask <br /> shall then be filled to the 250-milliliter mark with distilled water and <br /> the solution mixed thoroughly. A 10-milliliter aliquot of the anti-icing <br /> fluid solution and a 10-milliliter aliquot of the standard sodium <br /> di(2-ethylhexyl) sulfosuccinate solution shall be transferred to separate <br /> 100-milliliter oil sample bottles. Twenty milliliters of the methylene <br /> blue chloride solution and twenty-five milliliters of c.p. chloroform shall <br /> be added to each bottle. The bottles shall be stoppered and shaken vig- <br /> orously for several seconds. The contents of each bottle shall then be <br /> titrated with the 0.005 N. cetyl pyridinium bromide until the blue color <br /> in the chloroform (lower) layer begins to migrate to the upper layer. The <br /> reagent shall be added to 1.0-milliter portions with vigorous shaking of <br /> the bottle after each addition. The titration shall be continued drop by drop <br /> until the color intensities of both layers match exactly when viewed in <br /> transmitted light. The sodium di(2-ethylhexyl) sulfosuccinate content <br /> shall be computed as follows: <br /> content (percent) = 100 Wl T2 <br /> W2 Tl <br /> where <br /> Wl = weight of sodium di-(2-ethylhexyl) sulfosuccinate used for <br /> standard solution. <br /> W2 = weight of anti-icing fluid used for solution. <br /> Tl = ml of cetyl pyridinium bromide solution required by the <br /> standard solution aliquot. <br /> T2 = ml of cetyl pyridinium bromide solution required by the <br /> anti-icing fluid solution <br /> 7 <br />