4.7 Article

X-ray microtomography to evaluate the efficacy of paraffin wax coating for soil bulk density evaluation

期刊

GEODERMA
卷 337, 期 -, 页码 935-944

出版社

ELSEVIER
DOI: 10.1016/j.geoderma.2018.11.017

关键词

X-ray computed tomography; Soil porous system; Connectivity; Tortuosity; Soil bulk density

资金

  1. Brazilian National Council for Scientific and Technological Development (CNPq)
  2. Coordination for the Improvement of Higher Education Personnel (Capes) [303726/2015-6, 88881.119578/2016-01]

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The paraffin-coated method is a well-used approach to measure the soil bulk density (BD). BD is a physical property of great importance for studies of soil quality and health. Therefore, representative measurements of this property are highly valued. Resin and paraffin wax are utilized to coat soil samples; however, if these materials ingress into the sample it could affect the representativeness of BD evaluation. The advance in three-dimensional (3D) image analysis techniques such as X-ray microtomography (mu CT) offers a great opportunity to visualize and quantify the possible penetration of paraffin wax into clod samples. In this paper we investigated porous system morphological properties of soil samples coated with paraffin wax. The morphological properties of the pores filled with paraffin wax inside the samples were also studied. We observed qualitatively that samples with large pores close to their borders were more susceptible to the penetration of paraffin wax. Samples with pores > 10 mm(3) had the highest amount of paraffin wax into them. Triaxial shaped and complexly pores also offered less resistance to the ingress of paraffin wax. Positive relations between the amount of paraffin wax inside the samples and the volume of pores measured, pore tortuosity and degree of anisotropy were found. Conversely, the soil pore connectivity was not correlated with the penetration of paraffin wax into the samples, at least for the region of interest (approximate to 27.3 cm(3)) studied. Finally, an analysis of the impact of paraffin wax ingress inside the samples in measured BD showed increments of approximate to 0.09 and approximate to 0.11 g cm(-3) in this property when the paraffin wax penetrates into the large pores.

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