Surface-Active Properties of Particle Size Fractions in Two Humic Acids

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概要

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• The relationships between surface active properties and humic acid (HA) particle sizes were investigated. Two HAs from an Ando soil and a Brown forest soil were separated into 6 particle size fractions by gel permeation chromatography. Surface-active properties characterized by surface excess value (Γ mol cm^<-2>), cross-sectional surface area per molecule (A nm^2), critical micelle concentration (CMC g L^<-1>), efficiency and effectiveness of water surface tension reduction were obtained by the measurement of the surface tension of HA solutions from different particle size fractions. For the HA from the Ando soil, except for the smallest particle size fraction, increasing particle size enhanced the efficiency of reduction of the water surface tension and decreased the CMC, while the effectiveness of reduction of the water surface tension was about the same. The surface activity of the HA from the Ando soil increased with increasing particle size. This phenomenon was similar to the surface activity of a homologous series of surfactants, which increased with increasing alkyl chain length. For the HA from the Brown forest soil, the smallest particle size fraction and three large fractions showed a high efficiency, namely a high surface activity. The smallest fraction from the Brown forest soil showed the highest efficiency and the lowest CMC value. In both HAs, the smallest particle size fraction showed exceptional .surface-active properties compared with the other fractions and three fractions with large particle size showed a higher surface activity than other smaller fractions.

• 社団法人日本土壌肥料学会の論文

著者

• Fujitake Nobuhide

  Faculty Of Agriculture Kobe University

• KAWAHIGASHI Masayuki

  College of Bioresource Sciences, Nihon University

• Kawahigashi Masayuki

  College Of Bioresource Science Nihon University

• Kawahigashi Masayuki

  College of Bioresource Science, Nihon University

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