passive air sampling of gaseous elemental mercury: a critical review
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2016
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Abstract
Because gaseous elemental mercury (GEM) is distributed globally through the
atmosphere, reliable means of measuring its concentrations in air are
important. Passive air samplers (PASs), designed to be cheap, simple to
operate, and to work without electricity, could provide an alternative to
established active sampling techniques in applications such as (1) long-term
monitoring of atmospheric GEM levels in remote regions and in developing
countries, (2) atmospheric mercury source identification and
characterization through finely resolved spatial mapping, and (3) the
recording of personal exposure to GEM. An effective GEM PAS requires a
tightly constrained sampling rate, a large and stable uptake capacity, and a
sensitive analytical technique. None of the GEM PASs developed to date
achieve levels of accuracy and precision sufficient for the reliable
determination of background concentrations over extended deployments. This
is due to (1) sampling rates that vary due to meteorological factors and
manufacturing inconsistencies, and/or (2) an often low, irreproducible and/or
unstable uptake capacity of the employed sorbents. While we identify
shortcomings of existing GEM PAS, we also reveal potential routes to
overcome those difficulties. Activated carbon and nanostructured metal
surfaces hold promise as effective sorbents. Sampler designs incorporating
diffusive barriers should be able to notably reduce the influence of wind on
sampling rates.
| Reference Key |
mclagan2016atmosphericpassive
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|---|---|
| Authors | ;D. S. McLagan;M. E. E. Mazur;C. P. J. Mitchell;F. Wania |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-3061-2016
|
| URL | |
| Keywords |
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