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Dissolution of Humic Substances from Highly Humic Volcanic Ash Soil as Affected by Anionic Surfactant, Electrolyte Concentration and pH

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Title: Dissolution of Humic Substances from Highly Humic Volcanic Ash Soil as Affected by Anionic Surfactant, Electrolyte Concentration and pH
Authors: Ahmed, Farook Browse this author
Ishiguro, Munehide Browse this author →KAKEN DB
Akae, Takeo Browse this author
Keywords: Surfactant
Humic Substances
Volcanic Ash Aoil
Issue Date: Mar-2012
Publisher: Scientific Research Publishing
Journal Title: Journal of Environmental Protection
Volume: 3
Issue: 3
Start Page: 280
End Page: 287
Publisher DOI: 10.4236/jep.2012.33035
Abstract: Dissolved humic substances separated from soils play an important role in the material cycle because they adsorb nu-trients and contaminants and move with water. This study was conducted to investigate the influence of anionic surfac-tant, pH and electrolyte concentration on the dissolution of humic substances from a highly humic volcanic ash soil. The soil used in the experiment has a negative charge and the anionic surfactant, sodium dodecylbenzene sulfonate, has also the negative charge. The absorbance of supernatant of soil solution at different surfactant concentration and dif- ferent electrolyte concentration (0.001 M, 0.01 M, 0.1 M & 0.5 M) of NaCl at pH 4.5 and 6.5 was measured at the wave-length of 400 nm; this corresponds to the relative concentration of dissolved humic substances. The surfactant adsorption and its equilibrium concentration under the same solution condition of the absorbance measurement were also measured in order to get their effect on dissolved humic substances. The zeta potential of soil particles was meas-ured in order to evaluate the influence of electrostatic potential on dissolution of humic substances. The concentration of dissolved humic substances increased at higher surfactant concentration and adsorption, at higher pH and at lower electrolyte concentration, because the electrostatic repulsive force between the soil particles and the dissolving humic substances became larger. Therefore, surfactant concentration and adsorption, pH and electrolyte concentration are im-portant when considering the fate of humic substances in soils.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 石黒 宗秀

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