1. CEFIC-LRI project DustEx DustEx Final report
ETH zürich
CEFIC-LRI project DustEx DustEx Final report

2. Project Structure
Newly included finished tasks are tasks 2.5 and 2.6 on uncertainty assessment and the complete work package 4.
ISES 2014

3. DustEx Model (WP 2)
Vilma Sukiene

4. Exposure assessment/ Pathway comparison
ISES 2014

5. Model Structure indoor air exposure ISES 2014 product dust
indoor air
product
dust
airborne particles
surfaces
lipid layer on skin
evaporation
partitioning
deposition/
re-suspension
sorption/desorption
direct product contact
exposure
ingestion
inhalation
dermal absorption
vacuum cleaning/
track out
ventilation
equation 2
equation 15
equation 8
equation 12
equation 17
equation 32
equation 34
equation 35
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6. Uncertainty assessment
The relative contribution of the dust exposure pathway is most sensitive to changes in kp_g (transdermal permeability) and Adust_ingest.
The combined effect of the uncertainty in kp_g and Adust_ingest leads to a variation in the benchmark Koa of two orders of magnitude (the log Koa varies from 8 to 10).
For all other parameters the effect on the inter-pathway comparison is limited.
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7. Validation
Figure 46 report
ISES 2014

8. Field Study (WP3)
Vilma Sukiene

9. Products Product: Transfer process: intentional release, i.e. spraying
abrasion + evaporation
direct diffusion + evaporation
evaporation
evaporation (with thermal exposure)
Transfer process:
intentional release, i.e. spraying
Product:
spray
3 plastic products
Custom-made
carpet
Vilma Sukiene

10. Model substances deuterium labelled substances 8 12 SVOCs 9 11 8 12
Adipates
2H4-DBA
2H4-DiBA
2H4-DEHA
2H4-DOA
Pyrethroid
Tetramethrin
Phthalates
2H4-DBP
2H4-DiBP
2H4-DEHP
2H4-DOP
Plasticizers
Insecticide
low Koa
high Koa
more volatile
less volatile
deuterium labelled substances
log Koa 8 12
SVOCs 9 11
log Koa 8 12
SVOCs 9 11
Vilma Sukiene

11. 1st field study x 5 spray 3 plastic products carpet S-high PV-lowPT PV
C-high
C-low
S-high
PV-high
PV-low
PT-high
PT-low
PH-high
PH-low
3 plastic products
carpet
spray
x 5
12 weeks
httpwww.pixeljoint.compixelart28191.htm

12. 2nd field study To check result reproducibility
C-high
C-low
S-high
PV-high
PT-high
PH-high
5 plastic products
carpet
spray
PT-low
PH-low
To check result reproducibility
To investigate dust on different surfaces
x 3
8 weeks
httpwww.pixeljoint.compixelart28191.htm

13. Results Air SOURCE Lifted dust Dust on the product Floor dust
Vilma Sukiene

14. µg/ g dust/ g substance*
Dust is relevant for substances with log Koa >10;
(consistency within apartments)
1st field study
ng/ m3 air/ g substance*
PT-plastic (thermal exp.)
PV-plastic vertical
PH-plastic horizontal
C-carpet
S-spray
*concentration in dust normalized by initial source strength (amount of substance in the source)
LODs
µg/ g dust/ g substance*
log Koa

15. µg/ g dust/ g substance* µg/ g dust/ g substance*
Substance distribution in the room
2nd field study: e.g. apartment 3; 8 week samples
avg 2.5x
avg 3.5x
µg/ g dust/ g substance*
PT-plastic (thermal exp.)
PV-plastic vertical
PH-plastic horizontal
C-carpet
S-spray
*concentration in dust normalized by initial source strength (amount of substance in the source)
LODs
avg 2.5x
avg
µg/ g dust/ g substance*
log Koa

16. µg/ g dust/ g substance*
Direct transfer increases the concentration in dust
1st field study
less volatile substances 10
104
106
102
µg/ g dust/ g substance*
Apartment
SOURCE - PH
Dust on the product

17. µg/ g dust/ g substance* µg/ g dust/ g substance*
Direct transfer increases the concentration in dust
1st field study
SOURCE - PH
Dust on the product
less volatile substances 10
104
106
102
µg/ g dust/ g substance*
Apartment
more volatile substances
Apartment 10
104
106
102
µg/ g dust/ g substance*

18. µg/ g dust/ g substance* µg/ g dust/ g substance*
Direct transfer increases the concentration in dust
1st and 2nd field studies
SOURCE - PH
Dust on the product
less volatile substances 10
104
106
102
µg/ g dust/ g substance*
Apartment
more volatile substances
Apartment 10
104
106
102
µg/ g dust/ g substance*

19. Interpathway comparison and case studies (WP4)
Vilma Sukiene

20. Interpathway comparison
weight fraction 0.1%
weight fraction 0.01%
Figures 13, 14
ISES 2014

21. Decision tree
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22. Case studies
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23. Case study 1 (toy, BPA, Table 21)
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24. Case study 2 (PCP, triclosan)
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25. Case study 3,4 (plastic objects, DEHP, Table 28)
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26. Conclusions New model for transfer of substances from objects to dust
Case studies showing that for most substances and uses at Tier 1 the direct pathway is much more important than ingestion of dust
Koa a very sensitive parameter
Field study: diect transfer from object to dust may be more important than previously assumed
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27. Thank you