Detn of Moisture

Coal, Analytical Procedures. The most frequently made analysis of coal is the proximate analysis. This includes detns of moisture, volatile matter, fixed carbon and ash. Sometimes it is combined with detn of sulfur and phosphorus, which really belongs to the ultimate analysis, and includes also detn of carbon, hydrogen, nitrogen and sulfur. In most cases, the heating value of coal expressed in BTU/lb is also detd,... 

Detn of Sand Test Value for LA A572-L Detn of Moisture in LA A572-3 Detn of Ball Drop Test Value for LA A573-L... 

Detn of moisture in AN is described by the following investigators a)Guichard (Ref 4)—detn of small amts of w by con tinuous weighing on a specially designed analytical balance b)Robens Levin (Ref 13), —detn of small amts of w employ ing azeotropic distn and subsequent detn of w in the distillate by titration with Karl Fischer reagent c)Eberius (Ref 15)—detn of w by the Karl Fischer method in ex plosives chemistry <0jensen et al (Ref... 

The quantitative analysis procedure involves gravimetric detn of the HMX on a moisture-free basis after benzene extraction of, and differential detn of TNT. Moisture content is detd by conductometric titration of sample in an acetic-sulfuric acid suspension. Acetone insoluble matter is determined gravimetrically... 

Buchner funnel and fill the funnel from % t0 % full of the Dynamite sample. The amt will depend on the expl oil content, which is detd from the ether extraction conducted as follows Pour in 50 mi of ether, cover the funnel with a watch glass, let stand to impregnate the sample and then apply suction. Repeat with 3 addnl 50-ml portions of ether and transfer the extract to a low beaker. Evaporate the ether at 50—60°C while passing over it a stream of dry air, taking care not to introduce any moisture. Continue evaporation until disappearance of ether odor and then for 15 mins longer. Filter off the resins, sulfur and other insol substances from the explosive oils, using a very small, fast filter paper (such as No 41 Whatman) into a rubber-stoppered bottle contg the expl oil previously obtd from detn of ether extract. 

In their Progress Report No 20-310 (Ref 20) are given descriptions and evaluations of the following methods of moisture detn a)Abder-halden Drying Procedure (by loss of wt) b)New Procedure for Determination of Moisture by Loss of Weight c)Oven-Drying at 130° d)Modified Karl Fischer Titration Apparatus for Use with AN Coated with ZnO e)Q-Metry Method (attempts to use this method were unsuccessful)... 

Vlll)Moisture in Dried LA. LA s dried at the Plant usually contain small amounts of moisture (0.3"0.4%). The following two methods for the detn of this moisture were studied at PicArsn by Bernstein (Ref 8) a)Closed Vessed Technique. Transfer carefully by a wooden spatula ca 2 g sample to a tared, flat top Pyrex, weighing vessel approx 55 mm in diam and 30 mm high, provided with a ground joint cap. Close the dish and accurately weigh the ensemble. Remove the cap and heat the vessel in an oven at 65° for 1 to 1% hrs. Cool for 20 mins in a desiccator over freshly prepd CaCIJf cap the vessel and reweigh... 

E) Moisture Reabsorption Test. Place the dried sample saved after detn of "Volatile Matter (Procedure A), in a desiccator contg 27% sulfuric acid soln and, after 24hrs at 25°, reweigh. Calc the percent increase as moisture reabsorption(Ref 5,p 5)... 

Refs l)K.Van Keuren, "A Procedure for Chemical Analysis of Composition A-3 , NAVORD Report 1781, US Naval Ordnance Laboratory, White Oak, Md. (1951) la)S.M. Kaye, PATR 1936 (1953) (Nonaqueous titration method for detn of RDX content in Comp A-3) 2)Anon, Military Explosives , TM 9-1910 (1955), 271 (Identification of Composition A-3) 3)Purchase Description X-PA-PD-940 (1956) (Karl Fischer moisture detn) 4)Federal Test Method Std No 141 (1958), Method 4082 (Karl Fischer moisture detn) 4a)C.C.Jamison, "Determination of Nitrogenous Coumpounds of Ordnance Interest by Chromous Chloride Reduction , PicArsn, FRL TechMemo ACS-3-60 (I960) 5)U.S. 

CA 40, 2764(1946) (Polaro-graphic detn of azide ion in general and in LA in particular) 5)D.F. Vasil ev, Trudy-KomissiiAnalKhim, OtdelKhimNauk, 2, [5], 90-5(1949) CA 44, 9300-1(1950) (Polarogra-phic detn of Pb content of LA) 6)US Military Specification MIL-L 3055(1949) and Amendment 1 (1952) (Requirements for crystalline LA intended for use in manuf of detonators, fuzes and priming compns) 7)W.H. Rinkenbach A. J.Clear, "Standard Laboratory Procedures for Sensitivity, Brisance and Stability of Explosives , PicArsnTech Rept 1401 (1944), Revised in 1950 8)J. Bernstein, "Determination of Moisture Content of Lead Azide , PicArsnGenLab Rept 51-H1-2331 (1951) (Comparison of closed and open vessel techniques) 9)US Rubber Co, Kankakee Ordnance Works, Joliet,... 

In their Progress Report No 20-310 (Ref 20) are given descriptions and evaluations of the following methods of moisture detn a)Abder-halden Drying Procedure (by loss of wt)... 

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