The Mercury samples are collected in a modified Aerochem
Metrics wet/dry precipitation collector. This instrument
consists of a two-container system with a movable lid designed
to expose the wet container and cover the dry container during
periods of precipitation, and vice versa.
Modifications include the downsizing of the original wet-side
orifice to a 128 cm diameter and the addition of a second
orifice of the same diameter. The two wet-side orifices allows
for the simultaneous sampling of mercury and other metals.
The sample is removed from the collector every Tuesday and
mailed to the Hg Analytical Laboratory (HAL) at Frontier Geosciences
in Seattle, WA for analysis by cold vapor atomic fluorescence.