Sorption modelling of crude oil-contaminated soils using a derived spectral index

Hanly Simon Bingari*, Andy Gibson, Richard Teeuw

*Corresponding author for this work

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Abstract

Theoretical models to describe and evaluate sorption of hydrocarbons on soil particles are well documented but experimental results in the literature are scarce. This study describes the use of a spectral index to evaluate sorption phenomena in oil-contaminated soils at micro and macro levels. Experiments involved oil-dosing from 0.25 mL to 4 mL and the application of a spectral index to estimate the sorption capacity of different soils based on change in statistically derived Critical Point (CP). Results show that sorption of oil varies with soil type, specifically the proportion of clay in a soil/sediment and the clay species, in the order smectite > illite > kaolinite. In support of theoretical models, this work proposes a model from experimental data that explains observed phenomena of soil-oil interaction with changing soil composition. The location and prominence of the CP is also strongly affected by soil moisture, particularly in coarse-grained soils, potentially providing insight to soil-oil–water interaction. The methods developed using a simple synthetic crude provide potential to explore other contamination scenarios including different soil compositions, types of petroleum products and different environmental controls.

Original languageEnglish
Article number116935
Number of pages13
JournalGeoderma
Volume447
Early online date8 Jun 2024
DOIs
Publication statusPublished - 1 Jul 2024

Keywords

  • Conceptual sorption model
  • Hydrocarbons
  • Oil-contamination
  • Soil-oil interaction
  • vis-NIR spectroscopy

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