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Effect of adsorption site potential on adsorption of sodium dodecylbenzenesulfonate in highly humic volcanic ash soil

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Title: Effect of adsorption site potential on adsorption of sodium dodecylbenzenesulfonate in highly humic volcanic ash soil
Authors: Ahmed, Farook Browse this author
Ishiguro, Munehide Browse this author
Keywords: adsorption
anionic surfactant
electrolyte concentration
humic soil
Issue Date: Jun-2015
Publisher: Taylor & Francis
Journal Title: Soil Science and Plant Nutrition
Volume: 61
Issue: 3
Start Page: 432
End Page: 439
Publisher DOI: 10.1080/00380768.2014.1003144
Abstract: Sodium dodecylbenzenesulfonate (DBS) is a very useful and widely used anionic surfactant. This surfactant sometimes creates environmental problems when it is released into the water environment. However, the factors influencing the adsorption of DBS in soil have not been studied well. In this study, the influence of the potential at the adsorption site on the adsorption of DBS in a soil was first elucidated using a theoretical adsorption equation. The soil was a highly humic soil with a negative charge. The amount of DBS adsorbed was measured with a batch method for different electrolyte concentrations of sodium chloride (NaCl) at pH 4.5 and 6.5. The adsorption site potential of the soil was obtained with the modified Langmuir adsorption equation. The adsorption of DBS decreased as the electrolyte concentration decreased and as the pH increased because the repulsive electric potential between DBS and the soil increased. These results were confirmed by the obtained adsorption site potential and the measured electrophoretic mobility. The difference between the adsorption of DBS with a linear and with a branched carbon chain was also detected, and this difference was related to the free energy of micellization. Because DBS adsorption is strongly affected by electrolyte concentration and pH, these two factors must be carefully considered to predict the fate of DBS in soil and water environments.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Soil science and plant nutrition on 2015, available online:
Type: article (author version)
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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