Between rods and screens 100,650 Significant at odds of 95 to 5 Between latices 709,556 Between days within latices 119, 983 Experimental error 23,615 Standard deviation = 154 seconds B. Of Screen Data Betxveen latices and days 395,602 Experimental error 12,628 Standard deviation = 112 seconds C. Of Rod Data Between latices and days 97,038
Nitroglycerin determination in methyl isobutyl ketone results in low values. Most of the solvent is removed by evaporation and the titration is conducted in dimethylformamide as described. In Table II, MNT was titrated in dimethylformamide, and nitrocellulose and nitroglycerin were titrated in ethylenediamine. The results in Table III, were obtained by dissolving the TXT in methyl isobutyl ketone and the inorganic nitrate in acetic acid. Aliquots were taken from the volumetric solutions and titrated (the TNT at 10 ml. per minute and the inorganic nitrate at 20 ml. per minute).The synthetic mixtures were made up on a percentage basis using c.p. grade ingredients with the exception of nitroglycerin (18.40% nitrogen) and nitrocellulose (12.52% nitrogen) which were assayed by means of the nitrometer.
A rapid and accurate method for the direct photometric titration of submilligram to decigram amounts of cerium(III), even in the presence of large amounts of cerium(IV), has been developed. The method is based on the oxidation of the cerium to the quadrivalent state with permanganate in a neutral pyrophosphate medium. Reducing agents such as mercury (II), vanadium-(IV), arsenic(III), antimony (III), thallium(I), and iodide interfere, as do substances such as chromium.(Ill) and fluoride, which form precipitates.
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