Rick Greene Delaware DNREC

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Presentation transcript:

Rick Greene Delaware DNREC Polybrominated Diphenyl Ethers (PBDEs) in Fish from the Delaware Estuary Delaware Estuary Science Conference 2007 January 24, 2007 Rick Greene Delaware DNREC

Acknowledgements Coauthors: Gary Buchanan, NJDEP Bruce Ruppel, NJDEP Data: DNREC NJDEP Jeff Ashley, Phil U and ANS (eel data) Ron Hites, Indiana University (salmon data) Sonya Lunder, EWG (SF Bay striped bass data) Mapping: Dave Wolanski, DNREC

Presentation Topics PBDE basics (structure, properties, uses, and distribution) Sample description PBDE results Comparison to other results Future research

PBDE Structure & Properties 2,2’,4,4’-Tetrabromodiphenyl Ether (BDE-47) Organohalogens C12H10-XBrXO (X=1-10) 209 possible congeners Hydrophobic, (leads to increased partitioning into organic phases). P-C properties vary with # and position of bromines (experimental data are sparse). 4 3 2 5 6 6’ 2’ 5’ 4’ 3’

Uses and Distribution Introduced ~30 yrs ago. Currently considered an ‘emerging contaminant’. In 1000s of consumer products as flame retardants (e.g., foam in seating, textiles, circuit boards, wire coating, etc.). Widely distributed in the global environment (people, bears, whales, fish, algae, air, water, ww, sludge, soil, sediment, & house dust). Increasing US trends; falling European trends. Manufacturing bans (penta and octa-BDE).

Topics PBDE basics (structure, properties, uses, and distribution) Sample description PBDE results Comparison to other results Future research

Fish Sampling for PBDEs 110 samples 38 locations 14 species Collected 9/03-11/05 (except 14 archived eel samples from 1998)

Pending Data DRBC: channel catfish & white perch from mainstem Estuary + smallmouth bass & white sucker non-tidal mainstem. DNREC: striped bass, Atlantic croaker, tautog, and black sea bass. ANS: trophic transfer study in Tinicum Marsh (PA Sea Grant project). NJDEP: subset from monitoring program.

Topics PBDE basics (structure, properties, uses, and distribution) Sample description PBDE results Comparison to other results Future research

PBDE, Length & Lipid Significant relation between PBDE & length for bluefish. Ditto for PBDE & lipid for channel + white catfish. No others.

The Big Tuna Species: Bluefin Tuna 873 pounds 9’ 6” long; 6’ 6” girth Caught July 2, 2005 Hot Dog Canyon (~40 miles E of IR Inlet) New DE Record (by > 500 pounds). Age from charts: 30 yrs +/- 10 yrs.

Topics PBDE basics (structure, properties, uses, and distribution) Sample description PBDE results Comparison to other results Future research

Summary of Results Total PBDE in DE Estuary fish: 0.6 – 407.9 ppb ww fillet (0.01 – 20.2 ug/g lipid). Mean = 32.2 ppb ww (2.08 ug/g lipid). BDE-47 > 100 > 99 > 154 > 49 > 209, with BDE-47 contributing ~50% of total. PBDE in bluefish increases with length and increases in catfish with lipid. BMF = 3.2 between large bluefish and giant bluefin tuna. Uptake in stocked trout is congener-specific and decreases as Kow increases. Total PBDE in DE Estuary fish is greater, on ave., than in fish elsewhere. DE Estuary fish >> other U.S. meats.

Topics PBDE basics (structure, properties, uses, and distribution) Sample description PBDE results Comparison to other results Future research

Future Review new data when available (DRBC, DNREC, ANS, NJDEP & others). Continue to collaborate and share data. After EPA IRIS tox reports updated, perform risk assessment and revisit fish advisories. If truly a problem, assess sources, fate & transport, and trophic transfer. Monitor trends.

Thank You