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Mercury Deposition/Concentration

Learn about the measurements, deposition, and concentration of mercury in Maine's air, land, and water. This information is crucial for protecting the environment and assessing air quality.

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Mercury Deposition/Concentration

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  1. Mercury Deposition/Concentration Richard T. Greves ES III, Atmospheric Science & Analysis Section Air Quality Assessment Division in the Bureau of Air Quality Richard.Greves@maine.gov MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION Protecting Maine’s Air, Land and Water 1

  2. Measurements • Concentration (mass per unit volume) • Precipitation-weighted mean • mg/liter • Deposition (mass per area over a given timeframe) • kg/ha (kilogram per hectare) • 1kg/ha = 0.0001 kg/m2 (1 ha = 10,000 m2) About 2.5 acres 2

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  4. MAINE DEPARTMENT OF ENVIRONMENTAL PROTECTION www.maine.gov/dep 4

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  13. Deposition • Deposition is computed by multiplying the precipitation-weighted mean concentration (mg/L) for VALID samples by the total precipitation amount in centimeters for the summary period (ppt) and dividing by 100. 13

  14. 6.2 6.6 7.4 7.2 7.2 5.9 9.6 6.7 7.2 14

  15. 6.0 5.4 7.2 5.6 5.3 8.5 5.7 6.7 6.2 15

  16. Richard T. Greves ES III, Atmospheric Science & Analysis Section Air Quality Assessment Division in the Bureau of Air Quality Richard.Greves@maine.gov 16

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