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Volume 10, issue 10 | Copyright
Atmos. Meas. Tech., 10, 3651-3660, 2017
https://doi.org/10.5194/amt-10-3651-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 05 Oct 2017

Research article | 05 Oct 2017

The effects of meteorological parameters and diffusive barrier reuse on the sampling rate of a passive air sampler for gaseous mercury

David S. McLagan, Carl P. J. Mitchell, Haiyong Huang, Batual Abdul Hussain, Ying Duan Lei, and Frank Wania David S. McLagan et al.
  • Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1065 Military Trail, M1C 1A4, Toronto, Ontario, Canada

Abstract. Passive air sampling of gaseous mercury (Hg) requires a high level of accuracy to discriminate small differences in atmospheric concentrations. Meteorological parameters have the potential to decrease this accuracy by impacting the sampling rate (SR), i.e., the volume of air that is effectively stripped of gaseous mercury per unit of time. We measured the SR of a recently calibrated passive air sampler for gaseous Hg in the laboratory under varying wind speeds (wind still to 6m s−1), temperatures (−15 to +35°C), and relative humidities (44 to 80%). While relative humidity has no impact on SR, SR increases slightly with both wind speed (0.003m3day−1 increase in SR or 2.5% of the previously calibrated SR for every ms−1 increase for wind speeds  > 1m s−1, typical of outdoor deployments) and temperature (0.001m3day−1 increase in SR or 0.7% for every 1°C increase). The temperature dependence can be fully explained by the effect of temperature on the molecular diffusivity of gaseous mercury in air. Although these effects are relatively small, accuracy can be improved by adjusting SRs using measured or estimated temperature and wind speed data at or near sampling sites. We also assessed the possibility of reusing Radiello® diffusive barriers previously used in the passive air samplers. The mean rate of gaseous Hg uptake was not significantly different between new and previously used diffusive barriers in both lab and outdoor deployments, irrespective of the applied cleaning procedure. No memory effect from Radiellos® previously deployed in a high Hg atmosphere was observed. However, a loss in replicate precision for the dirtiest Radiellos® in the indoor experiment suggests that cleaning is advisable prior to reuse.

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Laboratory experiments indicate that the sampling rate of a passive air sampler for gaseous mercury is (1) not affected by relative humidity, (2) increases slightly with increasing temperature because of the effect of temperature on molecular diffusivity, (3) increases only slightly with wind speed as long as the wind speed is at least 1 m/s, and (4) is not changed when previously deployed diffusive barriers are used.
Laboratory experiments indicate that the sampling rate of a passive air sampler for gaseous...
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