Atmospheric mercury and trace metals in the Lake Champlain basin
Conference
·
OSTI ID:33540
- Univ. of Michigan, Ann Arbor, MI (United States). Air Quality Lab.
- Univ. of Vermont, Burlington, VT (United States)
Atmospheric mercury in the Lake Champlain basin is currently being investigated by UMAQL and the Vermont Monitoring Cooperative to assess the magnitude, deposition and seasonal variation of atmospheric mercury in the region. Measurements of mercury in precipitation and in ambient air (vapor and particulate phase) have been conducted at the Proctor Maple Research Center in Underhill, VT since December, 1992. Precipitation samples were collected on a daily event basis, and analyzed for total mercury. Rain samples of sufficient volume were also filtered to determine the percent of total mercury in the dissolved phase. Samples were analyzed for mercury using cold vapor atomic fluorescence spectrometry. ICP-MS will also be used to quantify a number of other trace metals in the precipitation. Concentration ranges for mercury in the vapor phase, particulate phase and in precipitation for Under hill to date are 1.2--4.2 ng/m{sup 3}, 1--43 pg/m{sup 3} and 1.5--26 ng/L, respectively. Seasonal trends were evident, with higher concentrations in precipitation and greater wet deposition in the spring and summer months, whereas particulate mercury concentrations were elevated in winter months. Trace metal concentrations in particulates obtained from the NESCAUM network, in precipitation from ICP-MS analysis and meteorological associations will be used to investigate the sources of atmospheric mercury to the Lake Champlain basin.
- OSTI ID:
- 33540
- Report Number(s):
- CONF-9410273--
- Country of Publication:
- United States
- Language:
- English
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