(1) Volumetric and spectroscopic methods, using dithizone for determining the minute quantities of silver in the mineral waters, were studied. (2) The amount of silver in mineral springs was estimated by the dithizone method. The occurrence of silver in the hot springs of Sukayu was spectroscopically detected and estimated to be about 10γ per litre. The dithizone method gave 12∼15γ Ag per litre.
The results of autoclave runs IIIA Ser. 100, IIIA Ser. 113 in dry and IVA Ser. 124 carried out in liquid paraffin have been compared and discussed rather quantitatively. It has been found that the main reactions involving the carbide are the same in the two systems. The differences found are attributable to the accumulation of the heat of reaction, while those among the series of the same system are, in addition, due to such secondary effects as the time of contact and the amount of the carbide present. From a considerable body of experimental results, it has been indicated that the role of the carbide is to dehydrate the methanol synthesized from carbon monoxide and hydrogen to produce isobutyl alcohol, and with further dehydration of the alcohols, hydrocarbon liquids are produced. Under certain conditions the principal fraction of the carbide acetylene may escape as free or form olefines and yellow powder, with only a slight formation of liquid products. It has been shown that cracking of the carbide acetylene is avoided at the expense of that of the medium.