Repositorio
Institucional

Ramirez-Flores, Juan Carlos

Bachmann, Joerg

Analyzing capillary-rise method settings for contact-angle determination of granular media

WILEY-V C H VERLAG GMBH

JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE

en

Water repellency is a relevant topic in soil-science research due to its effects on vegetation growth, occurrence of surface runoff, infiltration, and erosion. Different methods have been adapted for the assessment of soil wettability by measuring the contact angle (CA), like the capillary-rise method (CRM), where the liquid penetration dynamics into a dry sample is analyzed. However, questions related to sample preparation and the use of a suitable reference liquid in order to improve the reproducibility in such heterogeneous materials are still open. Different methods use ethanol as a reference liquid to quantify the degree of water repellency, like the molarity of ethanol droplets (MED), whereas other methods (CRM) suggest in addition n-hexane as reference. To date, no generally accepted protocol has been invented to apply the CRM to soil particles. By using model porous materials with defined and stable levels of water repellency (silt, sand, and glass beads), CA results were compared for different initial settings of the sample. The main objective was to prove the CRM as a reliable and reproducible method to characterize soil wettability and to specify general guide-lines for its application for granular materials in terms of sample size, sample-packing procedure, and reference liquid. Results showed that a sample weight of approximate to 2 g has a relatively lower CA variation between replications. The packing procedure showed erratic results in CA, proving to be a critical factor in reproducibility. A uniform criterion of samples packing is recommended regarding application of CRM in soils. Regarding the reference liquid, n-hexane should be preferred instead of ethanol for dynamic CA determination, because ethanol increased the tendency of CRM to overestimate angles due to dynamic effects, especially in finer-textured materials (i.e., silt).

Artículo original

This research was supported by the Chilean DIUFRO Project DI11-0051 (Direccion de Investigacion and Direccion de Cooperacion Internacional, Universidad de La Frontera), Chilean FONDECYT Postdoctorado Project 3120070, and Niedersachsen Foundation, Project NHDF N22002).

This research was supported by the Chilean DIUFRO Project DI11-0051 (Direccion de Investigacion and Direccion de Cooperacion Internacional, Universidad de La Frontera), Chilean FONDECYT Postdoctorado Project 3120070, and Niedersachsen Foundation, Project NHDF N22002).

10.1002/jpln.201100431

pdf

Lucas-Washburn equation

wettability

hydrophobicity

glass beads

liquid uptake

porosity

SOIL-WATER REPELLENCY

POROUS-MEDIA

PENETRATION

WETTABILITY

DYNAMICS

KINETICS

Ecuación de Lucas-Washburn

humectabilidad

hidrofobicidad

microesferas de vidrio

absorción de líquido

porosidad

REPELENCIA DEL SUELO AL AGUA

MEDIOS POROSOS

PENETRACIÓN

MOJADURA

DINÁMICA

CINÉTICA

Lucas-Washburn equation

wettability

hydrophobicity

glass beads

liquid uptake

porosity

SOIL-WATER REPELLENCY

POROUS-MEDIA

PENETRATION

WETTABILITY

DYNAMICS

KINETICS

Ecuación de Lucas-Washburn

humectabilidad

hidrofobicidad

microesferas de vidrio

absorción de líquido

porosidad

REPELENCIA DEL SUELO AL AGUA

MEDIOS POROSOS

PENETRACIÓN

MOJADURA

DINÁMICA

CINÉTICA

Ciencias del suelo

Geociencias

Ingeniería Ambiental y Geológica

Analyzing capillary-rise method settings for contact-angle determination of granular media

JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE

hibrida

verde

metadata

metadata

en

Artículo original

versión publicada

UFRO DI DI11-0051#ANID CONICYT FONDECYT 3120070#Niedersachsen Foundation NHDF N22002

UFRO DI DI11-0051

ANID CONICYT FONDECYT 3120070

Niedersachsen Foundation NHDF N22002

WILEY-V C H VERLAG GMBH

1436-8730

19

26

Agronomía

Ciencias Vegetales

Ciencia del Suelo

Agronomy

Plant Sciences

Soil Science

pdf

WOS:000316916100004