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[Effects of clay minerals on the transport of perfluorooctanoic acid in saturated porous media]. / 黏土矿物对全氟辛酸在饱和多孔介质中运移行为的影响.
Chen, Yi-Fan; Lyu, Xue-Yan; Yu, Zhi-Guo; Sun, Yuan-Yuan; Wu, Ji-Chun.
Afiliação
  • Chen YF; School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China.
  • Lyu XY; School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China.
  • Yu ZG; School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China.
  • Sun YY; School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.
  • Wu JC; School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.
Ying Yong Sheng Tai Xue Bao ; 33(12): 3363-3368, 2022 Dec.
Article em Zh | MEDLINE | ID: mdl-36601842
We examined the effects of representative clay minerals, montmorillonite (M) and kaolin (K), on perfluorooctanoic acid (PFOA) transport under saturated conditions. Results showed that low amounts of M or K addition increased and high addition amounts reduced PFOA retardation in quartz sand during the transport. With increasing addition of clay minerals (0-50%, weight ratio), the retardation factor of the M-added system increased from 1.03±0.00 to 1.31±0.03 and then decreased to 0.72±0.06, while that of the K-added system increased to 1.30±0.02 and then decreased to 0.49±0.11. Results of the tracer experiment showed that low amount of M or K addition did not produce preferential flow, while high amount addition induced obvious preferential flow, which resulted in the decrease in PFOA retardation. In addition, due to limitations of the highly negative-charged surface of the M or K modified sand and the solid-liquid ratio of column experiment, the modified M or K sand had low adsorption capacity of PFOA and thus almost did not affect PFOA retention. However, the adsorption and desorption of PFOA by clay minerals might still be responsible for the increases in PFOA retardation with low amount of M or K addition. The results are of great significance for accurately assessing the transport process and eco-environmental risks of PFOA in soil-groundwater systems.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Areia Idioma: Zh Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Dióxido de Silício / Areia Idioma: Zh Ano de publicação: 2022 Tipo de documento: Article