Involvement of leaf characteristics and wettability in retaining air particulate matter from tropical plant species

  • Barima, Yao Sadaiou Sabas (Universite Jean Lorougnon Guede, Unite de Formation et de Recherche en Environnement) ;
  • Angaman, Djedoux Maxime (Universite Jean Lorougnon Guede, Unite de Formation et de Recherche en Environnement) ;
  • N'gouran, Kobenan Pierre (Universite Jean Lorougnon Guede, Unite de Formation et de Recherche en Environnement) ;
  • Koffi, N'guessan Achille (Universite Jean Lorougnon Guede, Unite de Formation et de Recherche en Environnement) ;
  • Tra Bi, Fidele Zamble (Universite Jean Lorougnon Guede, Unite de Formation et de Recherche en Environnement) ;
  • Samson, Roeland (University of Antwerp, Department of Bioscience Engineering, Laboratory of Environmental and Urban Ecology)
  • Received : 2015.10.21
  • Accepted : 2016.02.02
  • Published : 2016.06.30


In most African urban areas, Particulate Matters (PM) concentration exceeds by far the WHO limits. In these areas, plants can play a key role in removing particles. In this study, we evaluated three ornamental species (Jatropha interrigima, Ficus benjamina, Barleria prionitis) used in Abidjan (Ivory Coast). Leaf-encapsulated saturation isothermal remnant magnetisation (SIRM) were measured and the relationship between PM captured and leaf wettability were done. The sampling were performed at roadsides and Parks. Firstly, Leaf-encapsulated and total leaf SIRM were quantified and the wettability was determined by drop contact angles (DCA). Secondly, the relationship between leaf SIRM and wettability was found. Results showed that leaf SIRM was two to ten times higher at roadsides than in Parks. Total leaf SIRM was also higher on mature leaves in Main roads suggesting a particle accumulation in leaves over time especially in waxy species (Ficus benjamina). This species encapsulated other than 20% of total leaf SIRM. All tested species were highly-wettable ($40^{\circ}$ < DCA < $90^{\circ}$). Thus, Jatropha interrigima with its leaf trichomes and F. benjamina with its leaf waxes were more wettable. A significantly positive correlation was found between wettability intensity and leaf SIRM.


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