Point Source Deposition of Mercury in Northern Florida - PowerPoint PPT Presentation

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Point Source Deposition of Mercury in Northern Florida

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Point Source Deposition of Mercury in Northern Florida A Tale of 2B (or not 2B) Kathleen J. Gosnell William M. Landing Jane Caffrey – PowerPoint PPT presentation

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Title: Point Source Deposition of Mercury in Northern Florida


1
Point Source Deposition of Mercury in Northern
FloridaA Tale of 2B (or not 2B)
  • Kathleen J. Gosnell
  • William M. Landing
  • Jane Caffrey

2
Quicksilver The Quick and the Dead
  • Mercury hopefully whats not for dinner
  • Harmful effects of Hg have been know for
    centuries
  • Methyl mercury is lethal for most organisms
  • accidental poisoning has become more prominent
    with increasing anthropogenic input to the
    environment
  • Minamata disease brought the problem to light for
    the public after 1950
  • acetaldehyde production company released waste
    containing high amounts of mercury into the bay
  • Local fisherman and villagers consumed large
    amounts of fish -gt got really sick -gt
    Neurological disorders

3
Compliments to the DEP website
4
What are the Point Sources of Hg?
  • Numerous studies have been done to determine
    global and regional deposition influences on
    Florida watersheds
  • Few studies have attempted to determine point
    source effect of known Hg emitters to the local
    watershed
  • How does local point sources influence local and
    global atmospheric mercury deposition?

5
  • This study looks at the influence of one large
    coal-fired power plant (Gulf Powers Crist plant)
    in northeast Pensacola
  • Coal combustion releases Hg into the atmosphere,
    primarily as vapor
  • Elemental Hg can have an atmospheric half-life or
    ½ to 2 years in the atmosphere before being
    released to the biosphere
  • What are other trace metal factors that can point
    to where mercury actually coming from?

6
  • 3 sample sites located at different distances
    from main point source
  • 1 mile
  • 2 miles
  • 7 miles (pristine?)
  • Annual sampling of individual rain events since
    2004

Molino
Pace
Ellyson
7
  • Rain events sampled episodically

8
  • Each sample ran for Hg
  • Each sample treated with 0.045 M HCl and 0.048 M
    HNO3, than UV Oxidized for 24 hr.
  • Analyzed by cold vapor atomic fluorescence
    spectrometry (CVAFS)
  • As well as a sweep of other trace elements,
    including alkaline metals and earth elements,
    rare earth elements, and all three lines of
    transition metals
  • Analyzed via Element ICP-MS and Quad ICP-MS

9
  • Monthly average total-Hg concentrations measured
    for 3 rain sampling sites

10
Regional Mercury deposition
11
Factor Analysis
  • Reduce the number of variables
  • Detect Structure in the Relationship between
    variables
  • Classify variables

12
(No Transcript)
13
1st Factor Land-Ho! Al, Si, Mn, Fe, Co (REE,
Rb, Cs, Th, U)
  • Indicates land (crust or dust) sources

14
Factor 4 Sea salt aerosolsSr, Na, Mg
  • Indicates Marine Source

15
Factor 3 Plants, Fire or Cement?
  • Elements associated with plants (P, Zn, Cd)
  • Byproduct of Cement production?

16
Pollution factor Hg, As, Sn, Se, Sb, Pb, Bi,
Cu?
R2 0.54
R2 0.40
R2 0.45
R2 0.30
17
  • Coal combustion in the southeastern US pollutes
    regionally with volatile elements such as
    mercury, arsenic, antimony and lead
  • Factor analysis Hg, As, Sn, Se, Sb, Pb, Bi, Cu
  • Different Factor Analysis components link Hg to
    other sources
  • can it be narrowed down?
  • Some factor analysis correlations dont make much
    sense
  • What about other factors?
  • Sulfate can be a coal plant by-product

18
  • Analysis Inter-Element
    Relationships
  • 4-factors Hg - Sb - Pb As Se Sn
    Bi V (Cu)
  • (no major ions)
  • 6 factors Hg - Sb - (Pb) (Ga)
    NO3 SO4 NH4
  • (no As, Se, Sn)
  • 7 factors Hg - Sb - Pb SO4
  • (all data)
  • 5 factors Hg Sb - Pb (V)
    NO3 SO4 NH4
  • (all data)

19
Conclusions
  • Factor analysis successfully yields information
    regarding possible point source categories for
    trace elements in rainfall
  • Alumino-silicate (dust), sea salt (marine) and P,
    Cd and Zn (plants?) factors appear consistent
    across all analyses
  • Number of components and allowed factors has
    dramatic influence on factor loading and
    inter-element relationships for Hg
  • consistent relationships emerges from analysis
    for Hg - Sb - Pb - SO4

20
Future Plans?
  • Set up a fourth sampling site
  • more pristine background site
  • More Meteorology
  • What is the reasoning behind the P - Cd Zn
    factor analysis relationship? And Why do Hg
    sources sometimes change with different factors?
  • How will the future coal scrubber affect Hg
    samples?
  • Estimated to start up late 2009
  • Keep on keeping on

21
Acknowledgements
  • Dr. William Landing, FSU
  • Dr. Jane Caffrey, UWF
  • EPA
  • Sikha Bagui UWF (Computer Science)
  • Subhas Bagui UWF (Statistics)
  • Jessie Brown UWF (Computer Science)
  • Thalassic Society Officers and Helpers
  • Student Samplers, delivery man, etc
  • Student Symposium 2008 attendees

22
Thank You!Thats All Folks
23
(No Transcript)
24
Major ion analysis
Compliments of UWF
25
Full Data set7 factors
  • Factor 1 Dust / Land
  • Factor 2 Sea salt
  • Factor 3 Bi, Cd, P, Zn
  • Factor 4 SO4, Hg, Pb, Sb
  • Factor 5 As, Se, Sn
  • Factor 6 NO3, NH4
  • Factor 7 Cr, Ni

Compliments of UWF
26
5 Factors
  • Factor 1 Al/Si - Dust
  • looks like F1 of 7
  • Factor 2 NO3, SO4, NH4, Hg, Pb, Sb, V
  • looks like F4F6
  • Factor 3 Sea salt
  • looks like F2 of 7
  • Factor 4 Bi, Cd, P, Zn
  • looks like F3
  • Factor 5 As, Se, Sn
  • looks like F5 of 7

Compliments of UWF
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