Title: Sensitivity analysis of probits with respect to Quantitative Risk Assessment of airborne toxic chemicals using IITD-QRA model

Authors: Manju Mohan, B.R. Gurjar

Addresses: Indian Institute of Technology Delhi, Centre for Atmospheric Sciences, Hauz Khas, New Delhi 110016, India. ' Indian Institute of Technology Roorkee, Department of Civil Engineering, Roorkee 247667, India

Abstract: This paper deals with the modification of a validated and operational heavy gas dispersion model, namely IIT Heavy Gas (IITHG) model-1, to propose a quantitative risk assessment tool named as IITD-QRA model. IITHG model-1 is modified based on the incorporation of appropriate probit equation and other necessary parameters (e.g., equipment failure rates, weather frequency, average population density etc.) to study the sensitivity analysis of various probit relationships in QRA. The large variation in risk estimates from different probits emphasises the need for cautious interpretation of risk estimates and well tested dose response curves based on experiments.

Keywords: acute toxic exposure; QRA; quantitative risk assessment; dense gas dispersion models; probit equations; hazardous chemicals; chlorine; heavy gas dispersion; air pollution; air quality; equipment failure rates; weather frequency; average population density; sensitivity analysis.

DOI: 10.1504/IJEWM.2010.035067

International Journal of Environment and Waste Management, 2010 Vol.6 No.3/4, pp.345 - 355

Published online: 02 Sep 2010 *

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