日本地球惑星科学連合2018年大会

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[EE] ポスター発表

セッション記号 A (大気水圏科学) » A-GE 地質環境・土壌環境

[A-GE31] 地質媒体における物質移動,物質循環と環境評価

2018年5月21日(月) 10:45 〜 12:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:小島 悠揮(岐阜大学工学部)、濱本 昌一郎(東京大学大学院農学生命科学研究科)、斎藤 広隆(東京農工大学大学院農学研究院、共同)、森 也寸志(岡山大学大学院環境生命科学研究科)

[AGE31-P01] Morphological Variations in Unsaturated Porous Media due to LNAPL Contamination

*Abhishek 1Brijesh K Yadav1Pankaj K Gupta1 (1.Indian Institute of Technology Roorkee)

キーワード:Light Non-Aqueous Phase Liquid (LNAPL), Contaminant Transport, Morphological Analysis , Batch experiment

Soil surface morphology is an important functional parameter in fate and transport of pollutants in subsurface. Surface properties of the grains play a crucial role in governing purification extent of polluted soil water systems because adsorption is the major natural governing phenomenon. There are various ways to quantitatively access the pollutants’ adsorption capacity of the porous media but microscale qualitative studies for the same have a limited front. Therefore, the aim of present study is to investigate the soil morphological changes on soil grain scale. Batch experiments having different concentration of a Light Non-Aqueous Phase Liquid (LNAPL), toluene, were performed. A series of six batch sets each containing 20 g of oven-dried sand with particle size of 0.5–1.0 mm and 40% porosity were prepared at room temperature under partially saturated condition.


Various concentrations of dissolved LNAPL varying from 5 to 100 ppm were fed in the designed batches. After 24 hours of the incubation, when the soil water concentration reached to equilibrium, the temporary slides of respective soil samples were prepared. To capture the high magnification at pore scale, scanning electron microscopy (SEM) analysis was conducted at magnification of 10×, 20×, 30× and 40×. The results showed that the level of soil surface losses and the number of cavities on soil surface were increased with increasing LNAPL concentration. Furthermore, attenuation in the brightness of the sand particles was observed with increment in LNAPL concentration indicating the more adsorption capacity of toluene at high concentration levels. Moreover, the natural carrying capacity of the porous media under consideration showed direct proportionality relationship with the available water content. Results of this study are helpful in investigating the geochemical stability of soil, remediation strategy and for upscaling of fate and transport of pollutants in subsurface environment.