Fine air pollution particles trapped by street tree barks: In situ magnetic biomonitoring

CASTAÑEDA-MIRANDA, ANA G.; LAVORNIA, JUAN M.; CHAPARRO, MARCOS A.E.; MARIÉ, DÉBORA C.; NATAL, MARCELA; CHAPARRO, MARCOS A.E.; MARIÉ, DÉBORA C.; NATAL, MARCELA; CHAPARRO, MAURO A.E.; GARGIULO, JOSÉ D.; BÖHNEL, HARALD N.; CHAPARRO, MAURO A.E.; GARGIULO, JOSÉ D.; BÖHNEL, HARALD N.; CASTAÑEDA-MIRANDA, ANA G.; LAVORNIA, JUAN M.

ENVIRONMENTAL POLLUTION

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2020 vol. 266

0269-7491

Particulate air pollution in cities comprises a variety of harmful compounds, including fine iron rich particles, which can persist in the air for long time, increasing the adverse exposure of humans and living things to them. We studied street tree (among other species, Cordyline australis, Fraxinus excelsior and F. pensylvanica) barks as biological collectors of these ubiquitous airborne particles in cities. Properties were determined by the environmental magnetism method, inductively coupled plasma optical emission spectrometry and scanning electron microscopy, and analyzed by geostatistical methods. Trapped particles are characterized as low-coercivity (mean ± s.d. value of remanent coercivity Hcr = 37.0 ± 2.4 mT) magnetite-like minerals produced by a common pollution source identified as traffic derived emissions. Most of these Fe rich particles are inhalable (PM2.5), as determined by the anhysteretic ratio χARM/χ (0.1?1 μm) and scanning electron microscopy (