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Health and environmental aspects of contamination due to old PCB containing sealants

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Health and environmental aspects of contamination due to old PCB containing sealants. Eero Priha, Tiina Rantio, Beatrice Bäck, Riitta Riala, Helena Kontsas and Sannamari Hellman* Finnish Institute of Occupational Health, PO Box 486, 33101 Tampere, Finland E-mail: [email protected]

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slide1
Health and environmental aspects of contamination due to old PCB containing sealants
  • Eero Priha, Tiina Rantio, Beatrice Bäck, Riitta Riala, Helena Kontsas and Sannamari Hellman* Finnish Institute of Occupational Health, PO Box 486, 33101 Tampere, Finland

E-mail: [email protected]

*Tampere University of Technology, PO Box 527, 33101 Tampere

slide2
PCB in sealants
  • PCB-containing elastic polysulfide sealants used in Finland between 1960-1975 in prefabricated concrete buildings estimated use of PCB 220 tons in over 10000 buildings
slide3
Quality and quantity of PCB
  • PCB content of sealant typically 10-20 % !
  • Mainly highly chlorinated PCB, Aroclor1260, sometimes Aroclor 1254
  • Concentration of dioxin-like PCBs low
  • Large prefabricated buildings may contain 100 kg PCB, normally 25-40 kg
slide4
Situation today 2003
  • About 85 % of old sealant replaced with new PCB-free material Soil near buildings contaminated with PCBs Instructions given by authorities how to treat old sealant and contaminated soil
slide5
Exposure of workers
  • About 150-300 workers involded in removal of old sealants in Finland Grinding of old seam exposes workers to high concentrations of PCB containing dust
slide7
Soil sampling - PCB
  • Over 100 top soil samples taken from yards of 5 apartment buildings (sealant removed 1-3 years ago) Grid sampling plan was applied, combined samples
slide9
PCB in soil / summary
  • Average concentration 6,8 mg/kg soil at 0-2 m from wall Average concentration 0,52 mg/kg at distance of 3-10 m PCB exceeds the Finnish limit value 0,5 mg/kg recommended by the Finnish Environment Agency ---> risk assesment needed
slide10
What should be done ?
  • PCB not an immediate health risk and long-term risks are low. However, PCB will stay in yard soil for tens of years.
  • Some recommendations or guidelines needed to reduce exposure!
slide11
Recommendations by Finnish environment authorities
  • Playgrounds/sandboxes should be moved from the vicinity of the walls (< 5 m) to other places
  • Gardening of edible fruit prohibited near walls
  • Other vegetation (decorative bushes/trees) recommended
slide13
Earlier guidelines 1999
  • Sealant from houses built between 1959-1980 should be studied for PCB content
  • If sealant contains PCB over 50 mg/kg, should be treated as hazardous waste
  • Removal of old sealant should be done following strict rules (windows should be closed, soil covered with plastic etc.)
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