Effect of an Anionic Surfactant on Hydraulic Conductivities of Sodium- and Calcium-Saturated Soils

The effect of sodium dodecylbenzenesulfonate （SDBS）, an anionic surfactant used widely in household products and industrial processes, on saturated hydraulic conductivities （Ksat） of an Anthrosol saturated with sodium （Na-soil） or calcium （Ca-soil） was analyzed in a laboratory experiment using the c...

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Bibliographic Details
Published in:Pedosphere 2006-10, Vol.16 (5), p.673-680
Main Authors: RAO, Pin-Hua, HE, Ming, YANG, Xian, ZHANG, You-Chi, SUN, Shou-Qin, WANG, Jiang-Sheng
Format: Article
Language:English
Subjects:
吸附作用
电导率
表面活性剂
阴离子
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Summary:The effect of sodium dodecylbenzenesulfonate （SDBS）, an anionic surfactant used widely in household products and industrial processes, on saturated hydraulic conductivities （Ksat） of an Anthrosol saturated with sodium （Na-soil） or calcium （Ca-soil） was analyzed in a laboratory experiment using the constant head method, and adsorption and dispersion experiments were also conducted to infer the possible mechanisms of Ksat fluctuations. The results showed that SDBS was more intensely adsorbed in the Ca-soil than in the Na-soil. With an increase in the SDBS concentration, the stability of the Na-soil suspensions decreased when the SDBS concentration was less than 1.2 mmol L^-1 and then above this concentration, increased markedly, while the stability of the Ca-soil suspensions increased gradually at all SDBS concentrations studied. With an increase in the SDBS concentration, the Ksat of the Na-soil increased, which resulted mainly from the increase of water channels in the soil because of the coagulation of the soil particles, while the Ksat of Ca-soil decreased mainly on account of the clogging of partial water channels by precipitated Ca（DBS）2 and the fine soil particles generated.
ISSN:1002-0160
2210-5107
DOI:10.1016/S1002-0160(06)60102-1