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Indtrængning af PCB i bygningsdele Primær,
sekundær og tertiær forurening Møde i PCB
netværket d. 16. april 2013 Lars
Gunnarsen Statens Byggeforskningsinstitut,
Aalborg Universitet
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Polychloreret biphenyl
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Damptrykkets temperaturafhængighed
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Grundlæggende om PCBer
Sum 7 congenerer 28, 52, 101, 118, 138, 153 og
180 De 12 dioxinlignende congenerer 77, 81,
105, 114, 118, 123, 126, 156, 157, 167, 169, og
189 Alle PCB congenerer akkumuleres i
kroppen 105 og 118 har WHO TEF på 0,0001 og for
156 er den 5 gange større Højest TEF har nr. 126
med 0,1 Damptrykket for PCB 118 ved 25 oC er
0,00119 Pa. I luft ved 1 atm svarer det til 263
µg/m3 Arbejdstilsynets grænseværdi 10
µg/m3 Sundhedsstyrelsen vejledende aktionsgrænser
3 og 0,3 µg/m3
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PCB 126, den dioxinlignende kongener med højest
TEF
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The purpose of this paper is to present an
approach to calculate the magnitude of secondary
and tertiary sources in PCB contaminated
buildings
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Methods
Paint and lacquer samples were taken using a
knife to scrape small parts off the wall and
floor. The concrete samples were taken by
sawing a small concrete block from a wall
including the line of sealant, breaking the block
perpendicular to the sealant and hammering out
concrete samples from the fracture surface using
a chisel in order to avoid heating the concrete
when sampling. At the chemical laboratory the
samples were homogenized and Soxhlet extracted
using toluene and purified on columns of silica
gel and finally the purified extracts were
analyzed by GC-HRMS.
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Concrete samples
Data fra Claus Lundsgaard, SBMI, 2012.
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Data fra Helle Vibeke Andersen et al Kortlægning
af eksisterende viden om indtrængning af PCB fra
fuger til beton, Miljøstyrelsen 2013.
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PCBtot (secondary source) in concrete
Distance from sealant mm 0 - 10 10 - 20 20 - 30 30 - 45 45 - 62 62 - 8
Mass per length mg/m 447 278 79 21 2.0 0.1
Fraction 54 33 10 2.6 0.2 0.02
Accumulated 54 88 97 99.7 99.9 100
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PCBtot (tertiary source) in surface materials
  Amount Thickness (mm) PCBtot (g)
Floor lacquer 7 m2 0.2 0.36
Floor wood 7 m2 20 0.39
Wall and ceiling paint 31 m2 0.6 4.40
Wall and ceiling concrete 31 m2 10 6.92
Sealant 0.2 m2 10 508.08
Concrete on both sides of sealant 40 m 62 33.20
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PCB whereabouts
After approximately 40 years the primary sources
contain 92 of the remaining PCB. 6 of the
remaining PCB has diffused into concrete along
the sealants making adjoining concrete an
important secondary source. The last 2 of the
remaining PCB may be found as tertiary pollution
of the large surfaces of walls and floor. In
the 17.4 m3 model room with an air change rate of
0.5 h-1 and the recommended highest concentration
of 300 ng/m3 in the room air, the annual PCB
removal capacity of ventilation becomes as low as
0.023 g/year or equal to 1 g after 44 years.
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Conclusions
Remove all primary sources when renovating rooms
with PCB containing sealants. Prioritize also
to alleviate emissions from concrete and other
materials that have been in direct contact with
primary sources. The expected few grams
deposited in the large area of wall paint and top
layer of concrete is an important emission source.
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