title: Effect of cationic and anionic surfactants on the sorption and desorption of perfluorooctane sulfonate (PFOS) on natural sediments.
abstract: Sorption and desorption of PFOS at water-sediment interfaces were investigated in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), and an anionic surfactant, sodium dodecylbenzene sulfonate (SDBS). CTAB remarkably enhanced the sorption of PFOS on the sediment. In contrast, the influence of SDBS to the sorption of PFOS was concentration dependent. Two contrasting factors were responsible for the phenomenon. One was the sorption of the surfactant itself to the sediment, which enhanced the sorption of PFOS. The other was the increase in solubility of PFOS caused by the adding of surfactants, which decreased the sorption of PFOS. SDBS had a much lower sorption capacity, but rather strong ability to increase the solubility of PFOS. High levels of SDBS remarkably reduced the sorption of PFOS on the sediment. These results imply that cationic and anionic surfactants may have contrast impacts on the distribution and transport of PFOS in the environment.
authors: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China. gpan@rcees.ac.cn
authors: Gang
authors: G
authors: Pan
authors: Chengxia
authors: C
authors: Jia
authors: Dongye
authors: D
authors: Zhao
authors: Chun
authors: C
authors: You
authors: Hao
authors: H
authors: Chen
authors: Guibin
authors: G
authors: Jiang
mesh_terms: D000327:Adsorption; D017738:Alkanesulfonic Acids / Q000737:chemistry*; D004463:Ecology / Q000379:methods; D004787:Environmental Pollution; D005466:Fluorocarbons / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012989:Soil Pollutants / Q000737:chemistry*; D013501:Surface-Active Agents / Q000494:pharmacology*
chemical_list: D017738:Alkanesulfonic Acids; D005466:Fluorocarbons; D012989:Soil Pollutants; D013501:Surface-Active Agents; C076994:perfluorooctane sulfonic acid