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5 of MIL-STD-286B, For rhis ‘ it differs from them in some “details. reason the ASTM method is described here To determine water, Fischer reagent (a soln of iodine, pyridine and sulfur dioxide in the molal ratio of 1:10:3) dissolved in anhydrous ethylene glycol monomethyl ether is added to a soln of the sample in anhydrous pryidineethylene glycol (1:4) until all w present has been consumed. This is evidenced by the persistence of the orange-red end point color; or alternatively by an indication of a galvanometers or siniIar current indicating device which re- , cords the depolarization of a pair of noble metal electrodes.

Cool the beaker and rinse its contents with 10ml benzene-free 95% ethanol into a dry test tube (I6 by 150mm). Add 1 ml of butanone (methylethyl-ketone), shake and add O. 5ml dilute alcoholic NaOH soln, which was previously prepd by diluting 1 volume of aqueous NaOH soln (40g NaOH per 100ml dktd w) with 10 vols of benzene-free 95% ethanol. Mix thoroughly and allow to stand for 5 minutes before testing it calorimetrically. 01% must be reddish. 2 Spectrophotometric Method for Benzene This method is based on the fact that benzene has a characteristic ab sorption curve in the ultra-violet region.

The blank values must agree to wi thin 2mg. If not, the analysis must be repeated For determination propellants, three of Moisture methods in single-base can be used: E 170 1. 3 to O. 5g of potassium tirtrate hemihydrate. 05% while the potassium salt should give a moisture content . 02 percent 5. 3 Turn the tempera~re and timer controls to the settings required m the applicable spec. , When the test is completed, read the wt of the moisture shown on the dial and convert to grams lOOA Percent of water =~ De- Dec 1967) in MIL-STD-286B (1 1.

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Encyclopedia of Genetics (Vol.3 K-P)


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