A method is described for the electrolytic determination of copper in fabrics treated with organo-copper fungicides. The samples investigated contained fire retardants as metallic oxides, among which were those of antimony, calcium, zinc, and iron. Antimony offers the greatest interference in the electrolytic determination of copper. This interference was eliminated by depositing the copper from ammonium tartrate solution with careful control of the cathode potential, using a laboratory potentiometer to measure the voltage. Data are presented showing that copper may be electroplated from ammonium tartrate solutions, containing a six-fold greater concentration of antimony, with a cathode potential of — 0.60 volts. Standard deviations for analysis of these solutions were small (± 0.001 mg. Cu/ml.), giving an error term of 0.05% (standard dev. of the mean, σ/mean determination × 100). Results are also given for analyses of fabrics containing copper-8-quinolinolate and copper naphthenate singly or in mixture. Standard deviations computed for these analyses also were small. A rapid and safe method for digesting cloth samples with sulfuric and perchloric acids is described. _
The "*Pu requirements, 55 -90g, for an artificial heart or circulatory assist device demand a fuel having minimal radiation properties. The preparation and evaluation of potential ^^^Pu fuel forms at the Los Alamos Scientific Laboratory has led to the development of four fuel compositions, electrorefined metal, ''^'Pu -3at. %Ga, ^^SpuNl^^ and ^^SpuO^l^ (The latter three fuels are made from electrorefined metal.) Theoretical and experimental studies of these fuels led to the conclusion that ^^PuOj*^ is the preferred composition for high temperature application in the artificial heart program. This fuel is prepared as a pressed and sintered oxide. Procedures have been developed for preparing and characterizing cylindrical oxide sources varying in size from one to fifty watts.
existent on this column. The retention times for the components also are constant regardless of sample composition. As little as 2 µg of MMH or N2H4 in a 3-µ1 water sample was detectable, resolved, and produced symmetrical peaks on column A. This indicates that only normal solvent-solute interactions are responsible for the separation on this column. Other columns such as F and G showed appreciable adsorption of H20, MMH, and N2H4 when the sample size was below 0.5 Ml.Column Stability. 2-Hydrazinopyridine is a strongly alkaline material and reacts rapidly with C02. Columns such as A, B, or C are stable for 6 to 10 days if some helium flow is maintained at all times; however, they deteriorate rapidly if exposed to the atmosphere for several days. Thermogravimetric analysis of 2-hydrazinopyridine indicates that significant vaporization losses occur above 80°C. Solvents with higher boiling points would be an advantage; however, chemical similarity should be maintained.
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