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Variability in Physical Constant Parameter Values from Standard Data Sources and the Implication of this Variability for Risk Analysis

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  • Dale J. Marino

Abstract

Physical property values are used in environmental risk assessments to estimate media and risk‐based concentrations. Recently, however, considerable variability has been reported with such values. To evaluate potential variability in physical parameter values supporting a variety of regulatory programs, eight data sources were chosen for evaluation, and chemicals appearing in at least four sources were selected. There were 755 chemicals chosen. In addition, chemicals in seven environmentally important subgroups were also identified for evaluation. Nine parameters were selected for analysis—molecular weight (MolWt), melting point (MeltPt), boiling point (BoilPt), vapor pressure (VP), water solubility (AqSOL), Henry's law constant (HLC), octanol‐water partition coefficient (Kow), and diffusion coefficients in air (Dair) and water (Dwater). Results show that while 71% of constituents had equal MolWts across data sources,

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  • Dale J. Marino, 2006. "Variability in Physical Constant Parameter Values from Standard Data Sources and the Implication of this Variability for Risk Analysis," Risk Analysis, John Wiley & Sons, vol. 26(1), pages 185-201, February.
    • Handle: RePEc:wly:riskan:v:26:y:2006:i:1:p:185-201
    DOI: 10.1111/j.1539-6924.2006.00721.x
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