有機還元剤によるクロム液の鞣皮性に関する研究-7-
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The glucose liquor was prepared by adding sulfuric acid to K2Cr2O7-glucose mixture with a different amount of glucose varying from the required amount for complete reduction to 200, 250 and 300% of the theoretically required amount under the best conditions for reduction efficiency.The precipitated chrome was determined by addition of an increasing volume of 0.1 N NaOH to 25 cc of 0.1% dilution of the chrome liquor. Then investigation was performed on the variation of maximum amounts of chrome precipitated by alkali and its relationship to the amount of cationic chrome which was absorbed by the cation exchanger, Dowex 50, X1.The results obtained are summarized as follows:1. The amount of precipitad chrome increased with the increase amount of alkali, reached the maximum value and then decreased, but a part of he chrome was not precipitated and remained in the liquor.2. The maximum precipitation amount, which was obtained by filtration after addition of alkali, nearly agreed with the amount of cationic chrome in the aged liquor.The agreement became less remarkable however, as the degree of dilution became higher.3. Both the maximum precipitation amount of chrome and the amount of cationie chrome showed the same tendency to decrease with the increase of glucose, but there was the difference of about 5% between them.It was found that 20-30% of total chrome contained in the glucose liquor used had not immed iately been precipitated by alkali.4. The maximum precipitation amount varied also with the amount of sulfuric acid.
- 公益社団法人 日本畜産学会の論文
公益社団法人 日本畜産学会 | 論文
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