Conductometric characterization of dissolved humic materials.
Conductometric characterization of dissolved humic materials.
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溶解腐殖质材料的电导表征。
DOI：
10.1016/s0039-9140(02)00052-8
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发表时间：
2002
期刊：
影响因子：
6.1
通讯作者：
R. von Wandruszka
中科院分区：
文献类型：
--
作者：
J. Riggle;R. von Wandruszka
用标准酸对溶解在稍微过量的氢氧化物中的腐殖酸和富里酸进行电导置换滴定。对应于腐植酸盐/黄腐酸盐质子化的滴定曲线的斜率与聚阴离子或聚集体的电泳迁移率有关，因此与它们的尺寸有关。在许多这些物种的大小和它们的电导斜率之间发现了有希望的定性一致性。腐殖质部分的分离以及通过光解和超声处理减小尺寸都导致斜率的预期减小。滴定过程中观察到的斜率略有减小暂时归因于膨胀（排水）腐殖质聚集体的收缩。
Conductometric replacement titrations of humic and fulvic acids dissolved in a slight excess of hydroxide were carried out with standard acid. The slope of the titration curve corresponding to the protonation of humate/fulvate was related to the electrophoretic mobility of the polyanions or aggregates, and hence to their dimensions. Promising qualitative agreement was found between sizes of a number of these species and their conductance slopes. Both the separation of humic fractions and size reduction by photolysis and sonication led to the anticipated decrease in slope. The slight reduction in slope observed during the course of the titration was tentatively ascribed to contraction of the expanded (drained) humic aggregates.