November 7, 2018 - 1:00 pm
November 7, 2018 - 1:30 pm
AddressWebinar - 1.00pm AEDT - up to 45 minutes View map
Vapour intrusion is a process that involves the migration of volatile chemicals such as benzene or trichloroethylene (TCE) from contaminated soil and/or groundwater into dwellings. Vapour intrusion results in inhalation exposures by occupants and environmental epidemiological studies in affected areas have reported increased risks of cancer and non-cancer effects.
Current risk assessment guidance includes modelling and measurement, however, these approaches are based on idealized contaminant source and migration characteristics, and have been found to have limited predictive value for health risk assessment.
A research project was undertaken over a 14-month period in a vacated slab-on-ground dwelling in Adelaide, South Australia where groundwater was impacted by TCE. The study examined temporal and spatial changes in indoor TCE concentrations with concurrent measurement of influencing variables under near real-time conditions. In addition, a trial of non-invasive environmental biological monitoring for TCE was also carried out.
Results reported spatial, diurnal and seasonal indoor TCE variations with peak concentrations masked by greater time-weighted average sampling. Ventilation, internal temperature, barometric pressure and wind direction were significant predictor variables in a multivariate model which showed close agreement with the dataset. End-exhaled breath sampling and testing under environmental conditions showed promise as a non-invasive means of assessing exposure and uptake under realistic conditions.
These findings enable the establishment of an evidence-based indoor air sampling strategy that represents ‘worst case’ conditions, consistent with the public health precautionary principle. The empirical data may also facilitate the refinement of an Australian non-steady-state time-dependent model of vapour intrusion in buildings.
About the Presenter
Dr Len Turczynowicz has over 30 years’ experience in public health toxicology and human health risk assessment. His qualifications include a Bachelor of Applied Science in Chemistry and Microbiology, a Master’s in Public Health and a PhD in Medicine and he has worked for the health department in South Australia, multi-national consulting companies and is currently in a university role. His focus is on improving exposure assessment associated with inhalation dosimetry in vapour intrusion. He has presented and published papers nationally and internationally.
This webinar attracts registration fees to cover the cost of the webinar service and the administrative time required to manage the event.
Late registration after 3 November, 2018 will incur an additional fee: AU$15
A recording of the webinar will be available to download if you are unable to participate at the scheduled broadcast time.
Jacinda Shen Training Manager