Pedosphere 16(5): 673--680, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of an anionic surfactant on hydraulic conductivities of sodium- and calcium-saturated soils |
RAO Pin-Hua1, HE Ming1 , YANG Xian1, ZHANG You-Chi1, SUN Shou-Qin1 and WANG Jiang-Sheng2 |
1 Department of Resource and Environmental Sciences, Shanghai Jiaotong University, Shanghai 201101 (China). E-mail: miughe@sjtu.edu.cn
2 Design Department of Binnan Oil Production Plant, SINOPEC Shengli Oilfield Company, Binzhou 256606 (China) |
| ABSTRACT |
| 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. |
| Key Words: adsorption, anionic surfactant, calcium-saturated soil, hydraulic conductivity, sodium-saturated soil |
| Citation: Rao, P. H., He, M., Yang, X., Zhang, Y. C., Sun, S. Q. and Wang, J. S. 2006. Effect of an anionic surfactant on hydraulic conductivities of sodium- and calcium-saturated soils. Pedosphere. 16(5): 673-680. |
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