クローム鞣の研究 : (第3報)比濁度一定部位に於けるクロームの皮への結合

概要

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When various quantities of KOH solution are added to the Cr-liquors (Cr2(SO4)3, K[Cr(C2O4)2], K3[Cr(C2O4)3], K[Cr(C2O4)2_]+Cr2(SO4)3, K3[Cr(C2O4)3]+Cr2(SO4)3) a gradual change occurred on the reading of photocolorimeter. When these changes are plotted on a graph, the lines thus formed may be divided to two hypothetic straight lines; one line may be due to colour change and the other to the gel formation. As the results of the studies on these absorption spectra, it is presumed that every chrome solution would have the same colloidal condition at the intersecting point of the above two straight lines. After the hide powder was, mixed to these chromes which may be in the same state as mentioned above, the quantitative determination of the chrome fixed to the hide powder was carried out. It is revealed that every chrome is fixed to the hide almost with the same quantity after 20 hours, but the mitxtures of anionic- and cationic-Cr are more promoted in the velocity of fixation to the hide than the singly used cationic.
社団法人日本農芸化学会の論文