Contribution of Binary Organic Layers to Soil Water Repellency: A Molecular Level Perspective

The Journal of Physical Chemistry. a
S M Mijan UddinDavid J Henry

Abstract

Soil water repellency (SWR) is an extensively occurring phenomenon on natural and agricultural soils with a severe impact on soil water relations and thus crop yields and ecosystem productivity. It is caused by long chain amphiphilic compounds that originate from plant cuticular waxes. However, the severity of SWR varies with soil physical properties and the concentration of the compounds closely associated with producing hydrophobic coatings on soil surfaces. The induction of SWR by hexadecane, isopropyl tetradecanoate, and palmitic acid (PA), as pure (individual) coatings and as coatings composed of binary mixtures, was investigated by applying a range of loadings on acid-washed sand (AWS) (300-500 μm diameter) and AWS with 5% kaolinite. Molarity of ethanol droplet (MED) tests were conducted to assess the severity of SWR. Palmitic acid was very effective at inducing SWR at loadings of >0.5 × 10-6 mol g-1. Hexadecane and isopropyl tetradecanoate had no effect on SWR when applied as single component coatings. However, when hexadecane was combined with palmitic acid, it enhanced the SWR effect of palmitic acid. In comparison, isopropyl tetradecanoate was found to partially mitigate the SWR caused by palmitic acid. The experiment...Continue Reading

References

Aug 11, 2006·The Journal of Physical Chemistry. B·David J HenryIrene Yarovsky
Feb 26, 2013·Scientific Reports·Zhaolin GuChuck Wah Yu
Dec 18, 2013·Environmental Science & Technology·Loukas PetridisMelanie A Mayes

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