Samples of Setaria viridis (wild foxtail) were collected from the side of a heavily traveled road near a steel manufacturing region in Pittsburgh. SEM-EDS techniques were used to locate and size 127 iron-containing particles deposited on awns near the tops of the plants. The particles were nearly perfect spheres of somewhat uniform diameter: 3.7 ± 2.2 pm (mean ± standard deviation). Application of deposition theories from the literature suggests that inertial impaction in low Reynolds number flow is responsible for transport of these particles onto the vegetation.
ASJC Scopus subject areas
- Environmental Chemistry