Indoor concentrations of PM2.5 and associated water-soluble and labile heavy metal fractions in workplaces: implications for inhalation health risk assessment

  • Efthalia KogianniEmail author
  • Athanasios Kouras
  • Constantini Samara
Air Pollution: Chemistry and Health Risks


PM2.5 (i.e., particles with aerodynamic diameters less than 2.5 μm) and the associated water-soluble, dissolved, and labile fractions of heavy metals (Cu, Pb, Mn, Ni, Co, Zn, Cr, and Cd) were determined in indoor air of twenty workplaces in Alexandroupolis (Northeastern Greece). PM2.5 concentrations exhibited significant variance across the workplaces ranging from 11.5 μg m−3 up to 276 μg m−3. The water-soluble metal concentrations varied between 0.67 ± 2.52 ng m−3 for Co and 27.8 ± 19.1 ng m−3 for Ni exhibiting large variations among the different workplaces. The water-soluble metal fractions were further treated to obtain the labile metal fraction (by binding with Chelex 100–chelating resin) that might represent a higher potential for bioaccessibility than the total water-soluble fraction. The largest labile (chelexed) fractions (48–67% of the corresponding water-soluble concentrations) were found for Cd, Mn, Cu, and Ni, while the labile fractions of Pb, Cr, Co, and Zn were relatively lower (34–42% of the corresponding water-soluble concentrations). Water-soluble and labile concentrations of heavy metals were further used to calculate cancer and non-cancer risks via inhalation of the PM2.5-bound metals. To our knowledge, this is the first study estimating the health risks due to the inhalation of water-soluble and labile metal fractions bound to indoor PM.


PM2.5 Indoor air Workplaces Water-soluble metal fraction Labile metal fraction Bioaccessibility Risk assessment 


Supplementary material

11356_2019_7584_MOESM1_ESM.doc (153 kb)
ESM 1 (DOC 153 kb).


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© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Environmental Pollution Control Laboratory, Department of ChemistryAristotle University of ThessalonikiThessalonikiGreece

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