Ambient elemental, reactive gaseous and particle-bound mercury concentrations in New Jersey, U.S : measurements and associations with wind direction: Research Project Summary



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Trenton, N.J. : Department of Environmental Protection, Office of Science


Two and a half years of ambient concentrations of elemental mercury, reactive gaseous mercury (RGM), and particle-bound mercury were collected at measurement sites at Elizabeth, NJ and New Brunswick, NJ with Tekran sampling units in order to gather information on ambient atmospheric mercury levels, to determine whether these levels could be associated with known sources, and to develop a method to analyze these data. The data were processed, summarized, and evaluated from a variety of perspectives. Data quality control and quality assurance procedures are described. Wind direction and wind speed data were also collected. Significant temporal variations in concentrations of all three species were observed. Some significant directional variations were also seen. The sporadic nature of many of the temporal variations is consistent with and could reflect highly variable emission patterns from anthropogenic mercury sources. Overall mean concentrations of all species were determined. These were, for Hg0 , Hgp, and RGM respectively: 2.25 ± 0.04 nanograms per cubic meter (ng/m3 ), 8.21 ± 0.39 picograms per cubic meter (pg/m3), and 8.93 ± 0.31 pg/m3 (arithmetic means and 95% confidence intervals) at Elizabeth, and 2.15 ± 0.02 ng/m3, 10.73 ± 0.45 pg/m3, and 6.04 ± 0.30 pg/m3 at New Brunswick. Mean concentrations were determined for 16 different sectors representing wind directions. The impact of one known large source is suggested by these data. Reasons for some directional variations are not apparent and suggest a need for further investigation.



Mercury - Environmental aspects, Air - Pollution