FATE OF MERCURY IN THE ARCTIC Michael Evan ... - COGCI

Fate of Mercury in the Arctic 66
generally reproducible as seen with the parallel measurements. The highest passive uptake resulted
from denuders deployed in the total sampling train, from inlet to filter pack with filter, exposed for
24.5 hrs in the laboratory, during the workweek, non heated. They were started in the morning and
analysed the next morning, resulting in a passive uptake of 0.12 pg Hg per hour.
80
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40
30
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10
0
RGM mass (pg Hg)
6 1 2 3 4 Average Std. Dev.
Figure 8. Mass of RGM collected concurrently in 4 annular denuders, 2 co-located parallel measurements,
in the laboratory of Dr. Steve Lindberg, Oak Ridge National Laboratory.
Figure 8., page 66, is a reproducibility experiment run with 4 co-located, non-heated denuder
sampling trains. Denuders 1 – 4 are actively sampled while denuder 6 is blanked handled and hung
without any sampling. Denuders are connected to a single pump via 2 T-type connectors as flow
splitters. Flow was controlled in each inlet with a mass flow meter. Denuder 6 is the field blank and
reported concentrations have the filed blank subtracted. Of the 4 denuders, only denuder three had a
value less than the three other denuders, 10% error taken into consideration.