The effect of pH modification on wetting kinetics of a naturally water-repellent coniferous forest soil

被引:8
作者
Amer, A. [1 ]
Schaltmann, G. E. [1 ]
Diehl, D. [1 ]
机构
[1] Univ Koblenz Landau, Res Grp Environm & Soil Chem, Inst Environm Sci, Fortstr 7, D-76829 Landau, Germany
关键词
EVAPORATION; EXTRACTION; DROPLET; MECHANISMS; DYNAMICS;
D O I
10.1111/ejss.12419
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The interfacial dynamics of soil-water interactions are greatly affected by the hydrophobic properties of organic matter. The causes and underlying mechanisms responsible for the development of soil water repellency (SWR) are still under discussion. Various environmental factors control the appearance and degree of SWR. In addition to water content and temperature, the wetting of soil depends greatly on the physicochemical characteristics of soil surfaces, which in turn depend on pH. In this contribution, we propose a reaction mechanism for the change in SWR that is observed when soil pH is changed. Wetting kinetics were studied by time-dependent sessile drop measurements (TISED) of the contact angle, the work of spreading and the diameter of the base of the drop as time elapsed under controlled relative humidity. Modification of pH strongly affected the wetting kinetics, suggesting maximum resistance to wetting at the control pH (3.6), with decreased resistance to wetting as pH was changed in either direction. The enhancement in wetting kinetics by the modification of soil pH can be attributed to the chemical modification in organic materials that coat the soil particles. This conclusion is based on the magnitude of activation energy associated with the spreading process. The combined effect of pH and temperature on the wetting kinetics, together with the compensation effect seen between the logarithmic pre-exponential factor and activation energy, suggests acid-base catalysed hydrolysis-condensation reactions are the dominant processes responsible for the chemical nature of SWR.
引用
收藏
页码:317 / 326
页数:10
相关论文
共 39 条
  • [1] [Anonymous], 2015, WORD SOIL RESOURCES
  • [2] Development of soil water repellency in the course of isothermal drying and upon pH changes in two urban soils
    Bayer, Julia V.
    Schaumann, Gabriele E.
    [J]. HYDROLOGICAL PROCESSES, 2007, 21 (17) : 2266 - 2275
  • [3] On the compensation effect in heterogeneous catalysis
    Bligaard, T
    Honkala, K
    Logadottir, A
    Norskov, JK
    Dahl, S
    Jacobsen, CJH
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (35) : 9325 - 9331
  • [4] On the derivation of Young's equation for sessile drops: Nonequilibrium effects due to evaporation
    Butt, Hans-Juergen
    Golovko, Dmytro S.
    Bonaccurso, Elmar
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2007, 111 (19) : 5277 - 5283
  • [5] Carter, 2008, CANADIAN SOC SOIL SC, P1262, DOI DOI 10.1017/S0014479708006546
  • [6] The role of fire and soil heating on water repellency in wildland environments: a review
    DeBano, LF
    [J]. JOURNAL OF HYDROLOGY, 2000, 231 : 195 - 206
  • [7] Effects of surfactant treatments on the wettability of a water repellent grass-covered dune sand
    Dekker, LW
    Oostindie, K
    Kostka, SJ
    Ritsema, CJ
    [J]. AUSTRALIAN JOURNAL OF SOIL RESEARCH, 2005, 43 (03): : 383 - 395
  • [8] Reaction of soil water repellency to artificially induced changes in soil pH
    Diehl, D.
    Bayer, J. V.
    Woche, S. K.
    Bryant, R.
    Doerr, S. H.
    Schaumann, G. E.
    [J]. GEODERMA, 2010, 158 (3-4) : 375 - 384
  • [9] The nature of wetting on urban soil samples: wetting kinetics and evaporation assessed from sessile drop shape
    Diehl, Doerte
    Schaumann, Gabriele E.
    [J]. HYDROLOGICAL PROCESSES, 2007, 21 (17) : 2255 - 2265
  • [10] Soil water repellency: Dynamics of heterogeneous surfaces
    Diehl, Doerte
    [J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2013, 432 : 8 - 18