Page 358 - Materials Chemistry, Second Edition

L1644_C08.fm Page 322 Tuesday, October 21, 2003 3:03 PM

Data describing the substance:
• Physicochemical properties
• Measured emissions into the compartments
• Background concentrations of the contaminant
• Toxicological properties consisting of cancer and noncancer potency
for human beings because only human risk is considered in CalTOX
Data characterizing the area:
• Geographical data such as size of the contaminated area
• Meteorological and hydrological data, e.g., the average depth of
surface water, the annual average precipitation, wind speed or envi-
ronmental temperature
• Soil properties, such as the organic carbon fractions
• Data about the human population, e.g., the average body weight or
daily intake rates for different kinds of food

In the present study, the objective of the application of CalTOX is to evaluate
the health of the population due to the 1,1,1-trichloroethane emissions from a landfill
applied to a determined area. First, the physicochemical properties of 1,1,1-trichlo-
roethane as well as the risk parameters were obtained from the database of CalTOX,
and are shown in Table 8.9 and Table 8.10, respectively. Then the geographical

TABLE 8.9
Value for Some Physicochemical Properties of 1,1,1-Trichloroethane

Compound name 1,1,1-Trichloroethane
Molecular weight (g/mol) 133.4
Octanol–water partition coefficient 2.7 × 10 2
Melting point (K) 242.75
Vapor pressure (Pa) 16,515.975
3
Solubility (mol/m ) 9.89505247
3
Henry’s law constant (Pa-m /mol) 1651.5975
2
Diffusion coefficient in pure air (m /d) 0.67392
2
Diffusion coefficient in pure water (m /d) 8.6386 × 10 –5
Organic carbon partition coefficient (L/kg) 110
TABLE 8.10
Value for Risk Parameters of 1,1,1-Trichloroethane
Compound name 1,1,1-Trichloroethane
EDF substance ID 71-55-6
Inhalation dose ADI for noncarcinogenic effects 0.28
Ingestion dose ADI for noncarcinogenic effects 0.5
Dermal dose ADI for noncarcinogenic effects 0.5
Total dose ADI for noncarcinogenic effects 0

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