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以Ferron计时比色法分析了柠檬酸盐、酒石酸盐和醋酸盐掩蔽硫酸铝溶液在多种用量比(n(有机酸)/n(铝))和溶液pH值条件下体系的组成分布,并结合27Al-NMR测试结果进行分析,结果表明,掩蔽后的硫酸铝水解溶液体系中的组成与未掩蔽的基本特点有相近之处,即主要由单核铝(III)配合物,大分子多核及2～4核低聚铝(III)配合物,以及高度聚合的胶体微粒组成,但溶液pH值和掩蔽程度明显影响各组份的比例,特别是前者。在制革生产可能的pH值范围内,即pH值=2.5～4.0,c(Al3+)=0.1mol/L,陈放24h后的掩蔽铝(III)配合物溶液中,高度聚合的胶体微粒的量极少。pH值≤1.0时,单核铝(III)配合物可达100%,pH值=3.0～4.0之间时,大分子多核铝(III)配合物含量有一个突跃,当pH值≥4.0时,溶液中绝大部份是大分子多核铝(III)配合物。
Ferron chromato graphy analysis of citrate, tartrate and acetate-masked aluminum sulfate solution in a variety of dosage ratio (n (organic acid) / n (aluminum)) and the solution pH conditions the composition of the system, The results show that the composition of the masked aluminum sulfate hydrolyzate is similar to the unmasked basic features, ie, it is mainly composed of mononuclear aluminum (III) complexes, macromolecular polynuclear And 2 to 4 nuclear oligomeric aluminum (III) complexes, as well as highly polymerized colloidal particles, but the solution pH and masking significantly affect the proportions of the components, especially the former. The amount of highly polymerized colloidal particles in a concealed aluminum (III) complex solution after 24 h of storage at pH values of 2.5 to 4.0, c (Al3 +) = 0.1 mol / L, Very few. When the pH value is less than 1.0, the mononuclear aluminum (III) complex can reach 100%. When the pH value is between 3.0 and 4.0, there is a sudden jump in the content of macronuclear aluminum (III) complex. When the pH value is ≥4.0 , The vast majority of the solution is macromolecular polynuclear aluminum (III) complexes.