銀,パラジウムおよびこれらの合金中の酸素の定量

概要

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Oxygen in silver, palladium, and their alloy was determined by vacuum fusion method (A), isotope dilution method using <SUP>18</SUP>O labelled carbon monoxide (B), and fast neutron activation method (C). Oxygen from silver sample was extracted at the furnace temperature of 1400°C. when metal bath technique was not used. Trace oxygen was extracted in the case of palladium not using metal bath at the temperature of 2100°C. The results of oxygen in silver gave the same value of 125ppm under these conditions: (A) gas extraction temperature of 1750°C with the platinum-tin bath, (B) no metal bath and the same gas extraction temperature, and (C) noise level between 6 MeV and 9MeV. The results of oxygen in palladium gave the same value of 63ppm by three methods. The analytical conditions are as follows: (A) 1750°C with the platinum and the platinum-tin bath techniques, (B) 1850°C without metal bath. The results of oxygen in palladiumsilver alloy by three methods were not coincident. Carbon monoxide was allowed to circulate in a furnace and gas adsorption curves by sample metals were measured at the different furnace conditions according to the operation presented in Bunseki Kagaku, 14, 708 (1965). Comparisons of determinations by these methods at various experimental conditions can easily give an accurate procedure, and the effects of gas adsorption and incomplete gas extraction from the furnace can be estimated.
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