Solution Properties of Marine Humic Acid. II.
Solution Properties of Marine Humic Acid. II.
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海洋腐植酸的溶液性质。
DOI：
10.5650/jos1956.32.10
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
S. Hayano
中科院分区：
文献类型：
--
作者：
N. Shinozuka;O. Shinji;S. Hayano
研究了不同中和度的海洋腐殖酸溶液的聚合电解性质。粘度和电位滴定曲线随时间变化，海洋腐殖酸溶液达到平衡需要一个月以上，而市售的Aldrich腐殖酸溶液在配制后约2 d左右就达到恒定状态。结果表明，海洋腐殖酸在溶液中具有类似聚皂的缓慢构象变化，其电位滴定曲线不具有明确的等当点。中和海洋腐殖酸的碱量确定为2.9meq/g，奥尔德里奇的为5.3meq/g。海洋腐殖酸的粘度行为类似于典型的带电荷的柔性聚电解质;在无盐溶液中，低浓度范围内粘度上升，盐的加入导致粘度下降。Aldrich的粘度值低，因为其分子量小。根据Staudinger方程，海洋腐殖酸的分子量估计为Aldrich的20倍。对比粘度与浓度曲线显示不连续点，表明聚集体的形成。发生聚集的浓度确定为0.1%。它也是通过使用Fuoss方程估计的。这些结果与以前的表面张力测量结果雅阁。
The polyelectrolytic properties of the marine humic acid solutions of various degree of neutralization have been studied. The viscosity and the potentiometric titration curve change with time; it takes more than one month to attain the equilibrium for the marine humic acid solution, while commercially available Aldrich humic acid solution becomes the constant state after about 2 d from its preparation. The results indicate that the marine humic acid slowly changes its conformation in the solution like polysoaps.Potentiometric titration curves of the humic acids do not exhibit well-defined equivalence points. The alkaline amount to neutralize the marine humic acid is determined to be 2.9meq/g and for Aldrich's 5.3meq/g.The viscometric behavior of the marine humic acid is similar to a typical flexible polyelectrolyte having charges; in the solution without salt the viscosity rises in the low concentration range and the addition of salt causes the viscosity decrease. The viscosity value of Aldrich's is low because of its small molecular weight. According to the Staudinger's equation, the molecular weight of the marine humic acid is estimated to be 20 times as high as that of Aldrich's.The reduced viscosity vs. concentration plots show discontenuous points which indicate the aggregate formation. The concentration at which aggregation occurs is determined to be 0.1%. It is also estimated by the use of the Fuoss' equation. These results are in good accord with that of the previous work on surface tension measurements.