| Title: | Kinetics and equilibrium partitioning of dissolved BTEX in PDMS and POM sheets |
| Author(s): | Nam GU; Bonifacio RG; Kwon JH; Hong Y; |
| Address: | "Department of Environmental Engineering, Daegu University, 201 Daegudae-ro, Gyeongsan-si, Gyeongsanbuk-do, 38453, Korea. Division of Environmental Science and Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Korea. Department of Environmental Engineering, Daegu University, 201 Daegudae-ro, Gyeongsan-si, Gyeongsanbuk-do, 38453, Korea. yshong@daegu.ac.kr" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-016-7098-y |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "Passive sampling of volatile organic chemicals from soil and groundwater is primarily important in assessing the status of environmental contamination. A group of low molecular weight pollutants usually found in petroleum fuels, benzene, toluene, ethylbenzene, and xylenes (BTEX) was studied for its kinetics and equilibrium partitioning with single-phase passive samplers using polydimethylsiloxane (PDMS) and polyoxymethylene (POM) as sorbing phase. PDMS (1 mm) and POM (0.076 mm) sheets were used for sorption of BTEX and concentrations were analyzed using GC-FID. The equilibrium absorption and desorption of PDMS in water was achieved after 120 min while POM sheets absorbed up to 35 days and desorbed in 7 days. The kinetic rate constants in PDMS is higher than in POM up to 3 orders of magnitude. Logarithms of partition coefficient were determined to be in the range of 1.6-2.8 for PDMS and 2.1-3.1 for POM. The results indicate that POM is a stronger sorbent for BTEX and has slower equilibration time than PDMS. The partitioning process for both polymers was found to be enthalpy-driven by measurement of K d values at varying temperatures. K d values increase at low temperature and high ionic strength conditions. Presence of other gasoline components, as well as dissolved organic matter, did not significantly affect equilibrium partitioning. A good 1:1 correlation between the measured and the predicted concentrations was established on testing the potential application of the constructed PDMS sampler on natural soils and artificial soils spiked with gasoline-contaminated water" |
| Keywords: | "Benzene/analysis Benzene Derivatives/analysis/*chemistry Dimethylpolysiloxanes/*chemistry Environmental Monitoring/*methods Groundwater Kinetics Resins, Synthetic/*chemistry Soil/chemistry Toluene/analysis Volatile Organic Compounds/analysis Water Polluta;" |
| Notes: | "MedlineNam, Go-Un Bonifacio, Riza Gabriela Kwon, Jung-Hwan Hong, Yongseok eng Germany 2016/06/24 Environ Sci Pollut Res Int. 2016 Sep; 23(18):18901-10. doi: 10.1007/s11356-016-7098-y. Epub 2016 Jun 22" |
