Adsorption behaviour and its mechanism of linear alkylbenzene sulphonate (LAS) on soils

Abstract

Abstract: The adsorption behaviour and its mechanism of linear alkylbenzene sulphonate (LAS) onsoils are studied at 25℃ using a continuous adsorption apparatus.The adsorptionisotherms of LAS on natural soils could be divided into two stages of linear and exponentially increasing.At low LAS contents (<90 μg ml^-1), the adsorption isotherms are linear (Kd= 1.2-2.0), and at high contents (>90 μg ml^-1), the cooperative adsorption isobserved and the adsorption amount of LAS is increased exponentially.The adsorptionmechanisms are mainly specific site surface interactions and hydrogen bonding, while theadsorption capacity is significantly dependent on the physical clay content of soils.

Key words: Surfactant, Detergent, Linear alkylbenzene sulphonate (LAS), Adsorption, Distribution coefficient, N-fixing tree species, enzyme activity, Chinese fir, PLFA

On Ziqing, Jia Liangqing, He Yaowu, Chang Shijun, Sun Tieheng, Ayfer Yediler, Antonius Kettrup. Adsorption behaviour and its mechanism of linear alkylbenzene sulphonate (LAS) on soils[J]. Chinese Journal of Applied Ecology, 1995, 6(2): 206-211.

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