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PCB : Detoxification of building materials in DK Presentation for EURITS d. 14 May 2012 PowerPoint Presentation
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PCB : Detoxification of building materials in DK Presentation for EURITS d. 14 May 2012 Lars Gunnarsen Danish Building Research Institute , Aalborg University. Polychlorinated biphenyl. PCB fundamentals. Sum 7 congeners: 28, 52, 101, 118 , 138, 153 og 180

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Presentation Transcript
slide1

PCB: Detoxification of building

materials in DK

Presentation for EURITS d. 14 May 2012

Lars Gunnarsen

Danish Building Research Institute, Aalborg University

slide3

PCB fundamentals

Sum 7 congeners: 28, 52, 101, 118, 138, 153 og 180

2 dioxin-like congeners: 77, 81, 105, 114, 118, 123, 126, 156, 157, 167, 169, og 189

All PCB congeners akkumulate in human bodies

105 og 118 has WHO TEF på 0,0001 and for 156 it is 5 times bigger

Highest TEF has nr. 126 with TEF equal 0,1

Vapor pressure of PCB 118 at 25 C is 8.974 × 10–6 mmHg

= 0.001196 Pa = 1.18 × 10-8 atm.

In air at 1,013 × 105 Pa (1 atm) this is equal to 12 ppb or 160 µg/m3

Occupational TLV is 0 µg/m3

The national Board of Health reccomends action limits set at 3 and 0,3 µg/m3 for indoor air

slide4

Construction products

Indoor air

SurfaceDust

Soil

slide5

Building area

Erection Year

slide6

1950 to 1976 where PCB containing sealant were on the marked 143 mill. m2 new buildings have been erected which is 37 % of the total building stock of 389 mill. m2.

Someinofficialguestimates

slide7

Temperature dependency of vapor pressure

EKSP(34,92 - 11,624*1000/(t + 273))

Equation valid 40-55 oC

slide9

PCB exposure from indoor air and health risks in relation to recommendations from National Board of Health

Recommendations are based on occupancy of buildings 24-7 for several years.

slide11

Homepage of

the project

SBi.dk/pcb

(in Danish)

slide13

Recent measurements

24 congeners included in the analysis: PCB-28, 52, 66, 74, 77, 81, 99, 101, 105, 114, 118, 123, 126, 138, 153, 156, 157, 167, 169, 170, 180, 183, 187 og189.

(Dioxin-like in red)

Blood samples furthermore included congener number 69, 178, 182 og 190.

sample summary
Sample summary
  • Results from:
    • 83 air samples (Birkhøj)
    • 20 sealant samples (Birkhøj)
    • 21 air samples (uncontaminated parts of FarumMidtpunkt)
    • Approx. 200 blood samples 100 from contaminated and 100 from PCB free appartments
slide15

Sealant samples were taken by knife for single use after removal of temporary sealing with aluminum tape and wodden panels.

slide16

Air samples were taken by adsorption on XAD-2 and a total sampling volume during approx. 24 hours of approx. 2.7 m3.

results air
Results, air

Birkhøj (n=83), PCBtot

  • Average: 1030 ng/m3
  • Interval: 168-3843 ng/m3
  • 80 appa. > 300 ng/m3 ; 8 appa. > 2000 ng/m3 ; 1 appa. >3000 ng/m3

Øvrige (n=21),

  • PCB > LOQ in 52%
  • Average = 6.0 ng/m3 ; interval <LOQ – 254 ng/m3
  • OBS! one appartment with high PCB-level. The occupant had lived 31 years in contaminated part and indoor air contamination from household contents suspoected.
resultats sealants
Resultats, sealants
  • Average ∑24PCB: 100 817 mg/kg (187 – 221 667 mg/kg)
  • Average PCBtot: 252 150 mg/kg (436 – 718 430 mg/kg)
air vs selants
Air vs. selants
  • Good correlation for low-chlorinated (even intercorrelation)
  • No correlation between air and sealants for highly-chlorinated
slide22

Sum of 12 dioxinlikecongeners

in indoor air (ng/m3)

slide29

Conclusions

There still is PCB in some buildings – maybe in approximately 10% of the buildings from the relevant period

Old sealants with PCB, will still be a significant source of PCB in indoor air, surface dust and the soil around the buildings. In rare cases this may lead to health risks for the building occupants

PCB in dwellings leads to a significantly increased PCB contamination of building occupants. For these people the dwelling causes by far the most PCB intake

Better ability to identify buildings with PCB is recommended

More efficient means of renovation of PCB contaminated buildings are recommended

More rigorous waste hanling recommended

More reseach, innovation and consistency recommended