[A-HW18] 水循環・水環境

[AHW18-P05] Exploration of Alcohol Adsorption Mechanisms in Polysulfone Carriers for Groundwater Flux Measurement

*Hyemin Park¹、juyeon Lee¹、Seonggan Jang¹、Minjune Yang^2,3 (1.Division of Earth Environmental System Sciences-Major of Earth & Environmental Sciences, Pukyong National University, Busan 48513, Korea、2.Division of Earth and Environmental System Sciences-Major of Environmental Geosciences, Pukyong National University, Busan 48513, Korea、3.Wible Co., Ltd.)

キーワード：groundwater flux, measurement, passive flux meter, alcohol

Understanding and managing aquifer systems requires precise measurements of groundwater flux, yet the limitations of current methodologies continue to challenge their accuracy and applicability. This study introduces a novel approach utilizing the adsorption behavior of alcohol-based tracers within polysulfone carriers to enhance the precision of groundwater flux measurements. Polysulfone, known for its adaptability in adsorption processes and ease of form modification, emerges as an optimal material to overcome the heterogeneity issue associated with conventional sorbents like granular activated carbon. In this study, polysulfone carriers were produced in two sizes, 3 mm (P-3) and 5 mm (P-5) in diameter, to compare the adsorption efficiency based on the size. The alcohols used, isopropyl alcohol (IPA) and 1-hexanol, which have different retardation factors, were subjected to adsorption experiments at concentrations of 0, 10, 25, 50, and 75 mg/L. The experimental data were then analyzed using adsorption isotherms (Langmuir and Freundlich) to evaluate the adsorption mechanisms. The adsorption of IPA and 1-Hexanol on polysulfone carriers demonstrated that the Freundlich model (R² > 0.99) was more suitable for explaining the adsorption behavior of both alcohols. The adsorption efficiency varied with the size of the carriers, showing higher efficiency for P-3 (IPA = 62%, 1-Hexanol = 99%) compared to P-5 (IPA = 13%, 1-hexanol = 38%). Additionally, for P-3, 1-hexanol (K_F = 2 mg^-nLⁿ/g, n = 0.9) showed higher Freundlich constants (K_F) and strength (n) than IPA (K_F = 0.009 mg^-nLⁿ/g, n = 0.9). These results indicate the advantage of using 1-Hexanol as a tracer and polysulfone carriers with a particle size of 3 mm. The desorption capabilities should be considered in future assessments to determine their potential as fluxmeter carriers.

Acknowledgments: "This research was supported by Learning & Academic research institution for Master's·PhD students, and Postdocs(LAMP) Program of the National Research Foundation of Korea(NRF) grant funded by the Ministry of Education(No.RS-2023-00301702)"