In: Journal of Hydrology and Hydromechanics, vol. 68, no. 4
Nasrollah Sepehrnia - Susanne K. Woche - Marc-O. Goebel - Jörg Bachmann
Detaily:
Rok, strany: 2020, 392 - 403
Jazyk: eng
Kľúčové slová:
Ethanol; Infiltration; Interface chemistry; Sorptivity; Thermal treatment; X-ray photoelectron spectroscopy.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
Microinfiltrometers to assess soil water repellency (SWR) are limited to small tension ranges and have different
technical setups, hindering a comparison between results from different laboratories. Hence, a microinfiltrometer
which considers various aspects like extent and persistence of SWR is needed. The technical update suggested here uses
glass tubes (e.g., 3 mm inner diameter), a fabric of mesh size 15 μm around the tip to enable good contact between soil
surface and tip, ultrapure degassed water, and an evaporation protection for tip and reservoir during long-term infiltration.
The adjustment of a continuous range of pressures and tensions (i.e., +0.5 to –40 cm) was done using glass tubes of
various lengths connected to the tip. Three soil samples with initial contact angles, CA, of 18°, 62°, and 91° after 25°C
treatment were additionally treated at 80°C to increase SWR persistence and CA. The soil particle interface chemical
composition was determined by X-ray photoelectron spectroscopy (XPS). The hydrophysical properties evaluated
included water and ethanol sorptivity as well as very important aspects of SWR, i.e. water drop penetration time, water
repellency cessation time, repellency index, and modified repellency index. The results derived from the technically
modified microinfiltrometer setup showed consistent differences between initial wettability and the water repellency cessation
time as a parameter describing the development of SWR with time. The interface O/C ratio as derived from XPS
data was negatively correlated with CA (p <0.05), thus proving the close relationship between interface chemistry and
wettability. Our findings illustrated a strong positive correlation (R2 = 0.99, p < 0.05) between sorptivity and O/C ratio
under –2 cm tension which can be considered as the universal tension for different aspects of SWR.
Ako citovať:
ISO 690:
Sepehrnia, N., Woche, S., Goebel, M., Bachmann, J. 2020. Development of a universal microinfiltrometer to estimate extent and
persistence of soil water repellency as a function of capillary pressure and
interface chemical composition. In Journal of Hydrology and Hydromechanics, vol. 68, no.4, pp. 392-403. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2020-0035
APA:
Sepehrnia, N., Woche, S., Goebel, M., Bachmann, J. (2020). Development of a universal microinfiltrometer to estimate extent and
persistence of soil water repellency as a function of capillary pressure and
interface chemical composition. Journal of Hydrology and Hydromechanics, 68(4), 392-403. 0042-790X (until 2019) . DOI: https://doi.org/10.2478/johh-2020-0035
O vydaní:
Vydavateľ: VEDA, Publishing House of the Slovak Academy of Sciences, Bratislava, Slovakia
Publikované: 15. 12. 2020