SEDIMENTARY HUMIC-ACID AND FULVIC-ACID AS SURFACE-ACTIVE SUBSTANCES
SEDIMENTARY HUMIC-ACID AND FULVIC-ACID AS SURFACE-ACTIVE SUBSTANCES
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DOI：
10.1016/0016-7037(83)90160-6
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发表时间：
1983-01-01
影响因子：
5
通讯作者：
TSUBOTA, H
中科院分区：
文献类型：
--
作者：
HAYASE, K;TSUBOTA, H
在5°C和25°C下测量了分子量从<10，000到> 300，000的沉积富里酸（FA）和腐殖酸（HA）的表面张力，在pH 8的宽浓度范围内（0.114-107.4 g/l）。HA以腐殖酸钠形式存在。表面张力随着HA和FA浓度的增加而降低，HA和FA都是表面活性材料，其中FA表现出最低的表面张力（31达因/厘米）。表面张力与表面张力的曲线。对数浓度给出了两条直线，在与表面活性剂类似的某个浓度处具有断裂。从断裂点的浓度，确定聚集浓度（AGC）。对于分子量大于10，000的HA，AGC随着分子量的增加而降低。HA越疏水，形成聚集体的趋势越大。表面过量（表面浓度）由表面张力-的斜率确定（2.3 × 10−10−5.5 × 10− 10 mol/cn2）。浓度低于AGC时的对数浓度。随着HA分子量的增加，HA在表面层的吸附量增加。
Surface tension of sedimentary fulvic acid (FA) and humic acid (HA) with molecular weight from < 10,000 to > 300,000 was measured at 5°C and 25°C, over a wide range of concentrations (0.114-107.4 g/l) at pH 8. HA was in the form of sodium humate. Surface tension decreases with an increase in HA and FA concentration and both HA and FA were found to be surface active materials with FA exhibiting the lowest surface tension (31 dynes/cm).Plots of surface tensionvs. log concentration gave two straight lines with a break at a certain concentration similar to surfactants. From the concentration at the break point, aggregation concentration (AGC) was determined. For HA with molecular weight above 10,000, the AGC decreased with an increase in molecular weight. The more hydrophobic the HA, the greater was the tendency to form aggregates. Surface excess (surface concentration) was determined (2.3 × 10−10−5.5 × 10−10mol/cn2) from the slope of the plot of surface tensionvs. log concentration for concentrations lower than the AGC. Adsorption of HA into the surface layer increased with increasing molecular weight of HA.