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Endocrine Disruptors in Our Environment. Linda Tseng August 6 th , 2009. Outline. Introduction EDCs of interest Results and Data Current and future work. Introduction. Definition of EDC

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endocrine disruptors in our environment

Endocrine DisruptorsinOur Environment

Linda Tseng

August 6th, 2009

outline
Outline
  • Introduction
  • EDCs of interest
  • Results and Data
  • Current and future work
introduction
Introduction
  • Definition of EDC
    • A substance that has an effect in humans similar to an effect produced by a naturally occurring estrogen, or such other endocrine effect
  • Chemical that disrupts any part of the endocrine system
introduction1
Introduction
  • Why are we interested in them
    • Harmful to humans & animals alike
    • Ubiquitously found
    • Bioaccumulative
    • Some are recalcitrant
edcs of interest
EDCs of Interest
  • PFCs
    • Surfactants, surface protectors
    • Fire fighting foams, insecticides, etc.
    • No known natural degradation pathways
  • Bisphenol A
    • Plasticizers, first used as an estrogen substitute
    • Polycarbonate plastics
    • ~15 days in river, ~4.5 hrs in air, ~30 days in soil
edcs of interest1
EDCs of Interest
  • (Galaxolide)
    • Fragrance
    • Shampoo, perfumes, body oils, lotions, deodorants, soaps, shaving creams, conditioners, furniture polishes, laundry detergents, fabric softeners, etc.
results data pfcs1
Results & Data—PFCs
  • SC mostly has lower conc than CC
  • LCC < UCC
results data pfcs2
Results & Data—PFCs
  • Water conc < sediment conc
  • Similar conc found at 3 locations

(ng/L)

results data pfcs3
Results & Data—PFCs
  • Higher conc upstream
  • Higher conc in sediment
  • Higher conc in CC
  • Potential sources
    • Land use*
    • Time of day variations
    • GW recharge
    • Sediment types
slide12

Flow Direction

Check Sink of Flow Direction

Because there were sinks in the flow direction, the sinks must be filled using Fill on the DEM, and another flow direction was created from the new DEM

DEM

Threshold flow accumulation to find river network

Flow Accumulation

Snap Pour Points of Watersheds

Stream Link

Identify Watersheds

results data pfcs4
Results & Data—PFCs
  • Why does CC have more PFCs?
    • Less developed land cover
    • GW recharge
    • Sediment types
results data pfcs5
Results & Data—PFCs
  • Extraction reproducibility
current research future plans
Current Research & Future Plans
  • BPA extraction from water & sediment
    • San Diego Creek
  • Galaxolide extraction in water & biosolids
    • Partition of xenobiotics in WWTPs
  • Future
    • Accumulation of xenobiotics in plants