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ENVIRONMENTAL MONITORING OF DIOXIN LIKE COMPOUNDS IN THE UNITED STATES. Commission for Environmental Cooperation of North America Fourth Workshop on Sources and Measurements of Dioxins, Furans and Hexachlorobenzene October 28-29, 2010. Dwain Winters Winters Environmental

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environmental monitoring of dioxin like compounds in the united states

ENVIRONMENTAL MONITORING OF DIOXIN LIKE COMPOUNDS IN THE UNITED STATES

Commission for Environmental Cooperation of North America

Fourth Workshop on Sources and Measurements

of Dioxins, Furans and Hexachlorobenzene

October 28-29, 2010

Dwain Winters

Winters Environmental

Bethesda, Maryland

critical areas for environmental monitoring
CRITICAL AREAS FOR ENVIRONMENTAL MONITORING
  • DIOXIN IN LAKE SEDIMENT
  • DIOXIN IN AMBIANT AIR
  • DIOXIN IN SOIL
national dioxin air monitoring network ndamn
NATIONAL DIOXIN AIR MONITORING NETWORK(NDAMN)
  • A nationally based ambient air monitoring network
  • The target analytes are vapor and particulate phases of dioxin-like compounds
  • 32 stations operated in rural and non-impacted sites
  • Network started in 1999 and ended in 2004
why was ndamn created
WHY WAS NDAMN CREATED?
  • Establishing background levels
  • Determining temporal and geographical variability
  • Investigating long-range transport and transboundary movement
  • Verify/calibrating EPA’s air models
  • Providing data to determine exposures

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slide8

Locations of NDAMN Stations

= Rural Site

= Remote Site

dioxin air sampler
Dioxin Air Sampler

Quartz Fiber Filter

for particle bound dioxin

PUF plug for vapor-phase dioxin

sampling frame
Sampling Frame

Sampling period:

  • 24 hrs/d; 7 d/wk
  • 28 days

All stations operate simultaneously with 4 sampling periods/year

general observations for ndamn from 1999 2001
General Observations for NDAMN from 1999 - 2001
  • The dominant CDD/F congeners in ambient air were the OCDD>1,2,3,4,6,7,8-HpCDD> 1,2,3,4,6,7,8-HpCDF> OCDF.
    • This profile was constant over all NDAMN sites.
    • The 1,2,3,7,8-PCDD contributes over 40% of the dioxin TEQ.
general observations for ndamn from 1999 2001 continued
General Observations for NDAMN from 1999 – 2001, continued
  • PCB-118 dominates coplanar PCBs in ambient air followed by PCB-105, PCB-77 and PCB-156.
  • PCB-126 dominates the TEQ.
ndamn conclusions
NDAMN conclusions
  • 22 rural sites:
    • Annual mean dioxin TEQ (WHO method) air concentrations
      • Range: 2 fg m3 to 28 fg/ m3;
      • Overall mean: 12 fg m3.
    • Mean annual PCB TEQ air concentrations
      • Range: 0.15 – 9 fg/ m3.
      • Overall mean: 1 fg/ m3.
    • These values are consistent with other studies of rural areas.
ndamn conclusions continued
NDAMN CONCLUSIONS, continued
  • 8 Remote Sites
    • Annual mean dioxin TEQ (WHO method) air concentrations
      • Range: 0.5 to 3 fg/ m3
      • Overall mean: 1.05 fg/ m3
    • Mean annual PCB TEQ air concentrations
      • Range: 0.05 – 1.0 fg/ m3
      • Overall mean: 0.23 fg/ m3
ndamn conclusions continued1
NDAMN CONCLUSIONS, continued
  • Dioxin concentrations at remote sites were on average one order of magnitude lower than what was measured at rural sites.
  • Although not statistically significant, PCBs were approximately 5-times lower in remote sites as compared to rural sites.
ndamn conclusions continued2
NDAMN CONCLUSIONS, continued
  • CDDs and CDFs air concentrations have generally remained about the same from 1999 – 2001 when all NDAMN locations are considered.
  • CDD and CDF air concentrations have decreased from 1999 to 2001 at a few specific locations.
national dioxin soil survey
NATIONAL DIOXIN SOIL SURVEY

NDAMN air sampling stations. Circles indicate stations included in soil survey and triangles are excluded stations.

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