Laura Salo This email address is being protected from spambots. You need JavaScript enabled to view it.1, Topi Rönkkö1, Sanna Saarikoski2, Kimmo Teinilä2, Joel Kuula2, Jenni Alanen1, Anssi Arffman1, Hilkka Timonen2, Jorma Keskinen1 

1 Aerosol Physics Laboratory, Physics Unit, Tampere University, Tampere 33720, Finland
2 Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki 00560, Finland


Received: December 11, 2020
Revised: April 13, 2021
Accepted: April 20, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.200660  


Cite this article:

Salo, L., Rönkkö, T., Saarikoski, S., Teinilä, K., Kuula, J., Alanen, J., Arffman, A., Timonen, H., Keskinen, J. (2021). Concentrations and Size Distributions of Particle Lung-deposited Surface Area (LDSA) in an Underground Mine. Aerosol Air Qual. Res. 21, 200660. https://doi.org/10.4209/aaqr.200660


HIGHLIGHTS

  • LDSA concentrations in an underground mine were much higher than ambient values.
  • The LDSA size distribution varied significantly due to different particle sources.
  • 68–84% of total LDSA was contributed by sub 1 µm particles.
  • Occupational exposure limits should also include LDSA values.
  • Electrical sensors are suitable monitors of LDSA in a mine environment.
 

ABSTRACT


Ultrafine particles produced by diesel-powered vehicles in underground mines are largely unaccounted for in mass-based air quality metrics. The Lung Deposited Surface Area concentration (LDSA) is an alternative to describe the harmfulness of particles. We aim to study concentrations and size distributions of LDSA at various locations in an underground mine as well as to evaluate the applicability of sensor-type measurement of LDSA. This study was conducted in an underground mine in Kemi, Finland, in 2017. Our main instrument was an electrical low-pressure impactor (ELPI+) inside a mobile laboratory. Additionally, five diffusion-charging based sensors were tested. The environment was challenging for the sensors as the particle size distribution was often outside the optimum range (20–300 nm) and dust accumulated inside the instruments. Despite this, the correlations with the ELPI+ were decent (R2 from 0.53 to 0.59). With the ELPI+ we determined that the maintenance area had the lowest mean LDSA concentration (79 ± 38 µm2 cm–3) of the measured locations. At the other locations, concentrations ranged from 137 to 405 µm2 cm–3. The mode particle size for the LDSA distribution was around 100 nm at most locations, with the blasting site as a notable exception (mode size closer to 700 nm). Diffusion-charging based sensors—perhaps aided by optical sensors—are potential solutions for long-term monitoring of LDSA if dust accumulation is taken care of. Our research indicates worker exposure could be reduced with the implementation of a sensor network to show which locations need either protective gear or increased ventilation.


Keywords: Occupational exposure, Electrical particle sensor, Fine aerosol, Ultrafine aerosol




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